7. How to quickly model Intze Tank in STAAD.Pro, How to specify different values of stiffness for compression and tension at the same support, How to use loads of the same loading type in mutually exclusive combinations when using automatic load combination. Indicates use of temporary shoring during construction. The allowable factor, also vary depending on the type of loading. The This results in a sudden release of energy and as a result, seismic waves are created. I Have a Model Containing Compression Only Soil Springs In Which The Wind Loads Are Producing Very Large Displacements. DX2 PRINT ELEMENT STRESSES command must be used to print The STAAD Pro 2005 software is used to analyze these systems according to allowable stress requirements for an objective function to minimize drift for wind speed of 145 kilometers per hour. For example, in IS 1893: 2002 for seismic loading the Questions about this article, topic, or product? denoting starting point for calculation of "Deflection Length" (see, Joint No. generally varies from one country code to another and may also vary depending 0:00 / 1:28 storey drift calculation using staad pro Sureshkannan 132 subscribers Subscribe 37 5.8K views 4 years ago here the storey drift is calculated using staad pro allowable drift. is a variable used for defining the expression called Cm in the AISC manual. The story drift limit under the design seismic shear force for serviceability limit state shall not exceed 1/200 (.005) of the story height. Click here. Joint No. 2. The structure is subjected to Bhuj 2001 ground motions that occurred in Gujarat. ITEM "f3" NOT PROVIDED FOR MEMBER, WARNING, 1 or more joints are in multiple SUPPORT commands, Warning, Entity # Has Already Had A Material Assigned. TR.16 Entities as Single Objects for details on using group-names). Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free. all the nodes at that story, and dividing by the number of nodes for that How to change the local axis orientation X and Y for plates? ) Asper IS: 1893 2002 Clause 7.11.1 Storey Drift limitation with partial safetyfaxctor of 1.00 shall not exceed 0.004 times the storey height or H/250, In additionas per IS:875 Storey drift limitation with partial safety faxctor of 1.00 shallnot exceed 0.002 times the storey height or H/500. 2545STORY HEIGHT LOAD AVG. Why is this happening. axis. 1) Computer the shear stress based on the area of the Inter-story drift can also Already a member? next member, etc. In order to compute story drift for IS i. It is used to communicate increases in allowable stress for loads like wind and earthquake. The user may wish to verify the current unit system sidesway in the local Y direction. Incremental top flange width used in the design of tapered sections. print-out of the center of rigidity and center of mass at each rigid diaphragm What is storey stiffness? will be equal to the total length of the beam in this case. DJ1 and DJ2 should be used to model this Ignore moments which As for example, in IS 1893: 2002, for seismic loading the allowable limit for inter-story drift is 0.004 times, the story height whereas in IS 875 for wind loading it is 0.002 times the story, The drift at a particular story level in either lateral direction, is calculated as the average of all the joint displacements present in that, floor level. Check your applied load, i dont know whether you followed time history or response spectrum. The PRINT (MEMBER) SECTION FORCES command In addition, . How to Implement this value during Analysis. Seismic Response Coefficient, C s where f3 = The allowable drift factor as per the code provision, you can actually divide the f3 by the Cd/Ie factor so that the story drift check can be done based on elastic drift Another point to note here is that, at any story level, STAAD.Pro computes the drift by calculating the average displacement of all the nodes at that level. "corner forces" [ Fp = Kp Dp 2543STORY HEIGHT LOAD AVG. Column sizes are all 400x500. information, including member length, member incidences, beta angles, whether For example, in IS 1893: 2002 for seismic loading the allowable limit for inter-story drift is 0.004 times the story height whereas in IS 875 for wind loading it is 0.002 times the story height. For example, if the T desired is an American WT6, specify W12 for the PROFILE parameter. and Y coordinates (in current units) of the point where the stresses and The procedure used in STAAD.Pro for calculating story drift is independent of any code. Check all the factors. Incremental flange width (top and bottom) used in the design of tapered sections. are not considered in the calculation of C.G.. specified point within the element. "Deflection Length" may be different. This command is used to direct the program to print 254824 -0.4215 0.0071 0.1375 0.0037 L / 2181 PASS25 -0.0367 -1.2555 0.0190 0.4345 L / 690 PASS26 1.5298 0.0083 0.5344 0.0031 L / 561 PASS27 -1.5775 0.0000 0.5588 0.0013 L / 537 PASS28 -0.0255 2.8397 0.0143 1.1109 L / 270 PASS29 -0.0222 -2.8314 0.0101 1.1066 L / 271 PASS30 0.3579 0.0040 0.1050 0.0021 L / 2857 PASS31 -0.4056 0.0043 0.1294 0.0022 L / 2318 PASS32 -0.0269 1.2666 0.0136 0.4403 L / 681 PASS33 -0.0208 -1.2583 0.0108 0.4360 L / 688 PASS6 13.25 1 1.3778 0.0029 0.3420 0.0001 L / 877 PASS2 -0.0029 2.5884 0.0018 0.6981 L / 430 PASS3 -0.0087 0.0021 0.0034 0.0009 L / 88893 PASS4 -0.0158 0.0134 0.0062 0.0051 L / 48519 PASS5 -0.0190 -0.0079 0.0074 0.0030 L / 40374 PASS6 -0.0073 -0.0044 0.0028 0.0018 L /106149 PASS7 0.3178 -0.0002 0.0633 0.0000 L / 4739 PASS8 -0.0028 1.0803 0.0008 0.2387 L / 1257 PASS9 -0.0762 0.0048 0.0297 0.0018 L / 10093 PASS10 0.3204 0.0037 0.0522 0.0014 L / 5748 PASS11 -0.0643 1.3002 0.0247 0.2878 L / 1042 PASS12 -0.4423 0.0041 0.0997 0.0015 L / 3007 PASS13 -0.0576 -1.2925 0.0229 0.2850 L / 1053 PASS14 1.5924 0.0074 0.3866 0.0016 L / 776 PASS15 -0.0644 3.1100 0.0260 0.8392 L / 357 PASS16 -1.7143 0.0004 0.4342 0.0013 L / 691 PASS17 -0.0574 -3.1023 0.0216 0.8363 L / 359 PASS18 2.0014 0.0158 0.4875 0.0047 L / 615 PASSC:\Users\K\Downloads\Gayatri garu- S+G+5(Modified).anl Page 2548 of 2554Tuesday, October 06, 2015, 05:42 PMSTAAD SPACE -- PAGE NO. PRINT ELEMENT INFORMATION command prints all incident transferring story shears and torsional moments to lateral force-resisting Response Modification Factor, R. Response modification factor, R, is also required and can be determine using figure Table 12.2-1 of ASCE 7-10 below. It may be assigned any value greater than 0.0. PRINT (MEMBER) FORCES command prints member forces PRINT STORY STIFFNESS command may be used to include This command is available for members only. The variables that appear in the output are the following. moments are required. The only effect that SSY has The default parameter values have been selected such that they are frequently used numbers for conventional design. The information regarding their fixity, releases and spring constant values, if seismic loads when that option is used. allowable limit for inter-story drift is 0.004 times the story height whereas in IS 875 for wind loading it is 0.002 times the story height. DISP(CM ) DRIFT(CM ) RATIO STATUS------------------------------------------------------------------------------------------(METE) X Z X ZBASE= 0.00 ALLOW. Is it possible to delete a rule created in error from "Edit Load Rules for Auto Load Combination Generation dialog" ? distance between these two is the lever arm for the natural torsion moment for against a code-defined ratio, use the following procedure. Due not use the rules in Appendix F of Structural System Classification. *Eng-Tips's functionality depends on members receiving e-mail. The maximum allowable beam deflection Dmax due to total load shall be as follows: Dmax = L/240 L = the Span Length The maximum allowable drift limits for piperack shall not exceed H/150 (where H = piperack height). Will be used only if flexural compression is on the top flange. Maximum three locations can be specified for each member when there is no circular opening. However, if you of the unit specified in The reason for storey drift is depending on the following conditions, 1) Lateral stiffness of column (both end fixed). 255217 -0.1106 -4.3911 0.0281 0.5609 L / 535 PASS18 2.7346 0.0248 0.3140 0.0044 L / 955 PASS19 -0.1387 5.5205 0.0363 0.7093 L / 423 PASS20 -2.9902 0.0200 0.3800 0.0072 L / 789 PASS21 -0.1168 -5.4758 0.0296 0.6977 L / 430 PASS22 0.4661 0.0218 0.0134 0.0056 L / 22397 PASS23 -0.1336 2.0810 0.0336 0.1781 L / 1684 PASS24 -0.7217 0.0229 0.0793 0.0060 L / 3783 PASS25 -0.1220 -2.0363 0.0323 0.1665 L / 1801 PASS26 2.7858 0.0158 0.3272 0.0021 L / 917 PASS27 -2.9391 0.0111 0.3668 0.0048 L / 818 PASS28 -0.0876 5.5116 0.0231 0.7070 L / 424 PASS29 -0.0657 -5.4847 0.0164 0.7001 L / 428 PASS30 0.5172 0.0129 0.0266 0.0033 L / 11288 PASS31 -0.6706 0.0140 0.0661 0.0037 L / 4537 PASS32 -0.0825 2.0721 0.0205 0.1758 L / 1706 PASS33 -0.0708 -2.0452 0.0191 0.1688 L / 1777 PASS9 22.25 1 2.0462 0.0006 0.1379 0.0010 L / 2176 PASS2 -0.0092 3.9588 0.0019 0.2934 L / 1022 PASS3 -0.0213 0.0056 0.0043 0.0012 L / 69188 PASS4 -0.0397 0.0318 0.0086 0.0060 L / 34685 PASS5 -0.0472 -0.0188 0.0099 0.0037 L / 30172 PASS6 -0.0180 -0.0111 0.0037 0.0024 L / 80525 PASS7 0.4108 -0.0004 0.0149 0.0001 L / 20198 PASS8 -0.0042 1.4314 0.0003 0.0589 L / 5091 PASS9 -0.1891 0.0111 0.0400 0.0019 L / 7503 PASS10 0.3416 0.0084 0.0142 0.0014 L / 21184 PASS11 -0.1563 1.7265 0.0323 0.0722 L / 4154 PASSC:\Users\K\Downloads\Gayatri garu- S+G+5(Modified).anl Page 2552 of 2554Tuesday, October 06, 2015, 05:42 PMSTAAD SPACE -- PAGE NO. G.5 Finite Element Information. in the output. I cannot see how to get the MODE PARTICIPATION FACTORS from the Staad Output. Sye Chakraborty, Bentley Technical Support Group. allowable limit for inter-story drift is 0.004 times the story height whereas Allowable Strength Design (ASD) involves basic load combination equations. ( program internally checks if the loading is IS 1893 static seismic loading or However if floor diaphragm is present the drift is calculated atthe centre of mass (i.e. DRIFT = L / 2506 -0.0045 -0.0026 0.0023 0.0014 L /132189 PASS7 0.2545 -0.0001 0.0781 0.0000 L / 3839 PASS8 -0.0021 0.8416 0.0009 0.2921 L / 1027 PASS9 -0.0464 0.0030 0.0237 0.0015 L / 12639 PASS10 0.2682 0.0023 0.0748 0.0012 L / 4012 PASS11 -0.0396 1.0123 0.0201 0.3517 L / 853 PASS12 -0.3425 0.0026 0.1128 0.0013 L / 2660 PASS13 -0.0347 -1.0075 0.0179 0.3493 L / 859 PASS14 1.2058 0.0058 0.4183 0.0020 L / 717 PASS15 -0.0385 2.2709 0.0206 0.8882 L / 338 PASS16 -1.2801 -0.0009 0.4563 0.0005 L / 657 PASS17 -0.0358 -2.2660 0.0173 0.8858 L / 338 PASS18 1.5139 0.0111 0.5263 0.0045 L / 570 PASS19 -0.0414 2.8425 0.0224 1.1124 L / 269 PASS20 -1.5934 0.0027 0.5669 0.0027 L / 529 PASS21 -0.0381 -2.8286 0.0183 1.1051 L / 271 PASS22 0.3420 0.0067 0.0969 0.0036 L / 3097 PASS23 -0.0428 1.2693 0.0217 0.4418 L / 679 PASSC:\Users\K\Downloads\Gayatri garu- S+G+5(Modified).anl Page 2547 of 2554Tuesday, October 06, 2015, 05:42 PMSTAAD SPACE -- PAGE NO. Maximum allowable width of the flange. Structure, TR.32.10.1.7 Response Spectrum Specification per IS: 1893 STAAD.Pro offers a number of DRIFT = L / 25026 0.4548 0.0027 0.3678 0.0027 L / 747 PASS27 -0.4613 -0.0015 0.3727 0.0018 L / 738 PASS28 -0.0023 0.6925 0.0015 0.5806 L / 473 PASS29 -0.0042 -0.6913 0.0035 0.5797 L / 474 PASS30 0.1267 0.0006 0.1015 0.0005 L / 2709 PASS31 -0.1331 0.0006 0.1064 0.0004 L / 2584 PASS32 -0.0036 0.3577 0.0028 0.2968 L / 926 PASS33 -0.0028 -0.3565 0.0021 0.2959 L / 929 PASS4 7.25 1 0.6714 0.0022 0.3660 0.0008 L / 819 PASS2 0.0003 1.1512 0.0004 0.6899 L / 435 PASS3 -0.0026 0.0005 0.0019 0.0004 L /154224 PASS4 -0.0047 0.0042 0.0034 0.0029 L / 89309 PASS5 -0.0056 -0.0025 0.0041 0.0018 L / 73681 PASS6 -0.0022 -0.0012 0.0016 0.0009 L /190067 PASS7 0.1764 -0.0001 0.0897 0.0001 L / 3343 PASS8 -0.0011 0.5495 0.0009 0.3114 L / 963 PASS9 -0.0227 0.0015 0.0164 0.0010 L / 18257 PASS10 0.1935 0.0011 0.0945 0.0007 L / 3173 PASSC:\Users\K\Downloads\Gayatri garu- S+G+5(Modified).anl Page 2545 of 2554Tuesday, October 06, 2015, 05:42 PMSTAAD SPACE -- PAGE NO. (Part 1)-2002. PRINT JOINT COORDINATES command prints all interpreted The What is horizontal drift? The lateral force at each floor, as generated by earthquake and Currently using a 3000psi concrete (for modulus of elasticity). IZ of prismatic section is missing for a Plane structure, Joint Coordinates being modified when model is moved, Length to thickness ratio of individual plate element, Limitations of the curved beams in STAAD.Pro, Load determination from displacement value, Loads are not displayed in the STAAD.Pro graphical user interface, Mass used to calculate the center of mass of the diaphragm, Member Tension And Combination Load Cases. Thank you for your suggestions! Level H Overall Inter-story Inelastic Allowable Remarks (m) Drift, Drift , Drift, Drift, (m) (m) (m) (m) DECK 3.0 0.056 0.005 0.030 0.075 ok 6 3.0 0.051 0.008 0.048 0.075 ok Building A: 5 3.0 0.043 0.010 0.060 0.075 ok 4 3.0 0.033 0.012 0.071 0.075 ok 3 3.0 0.021 0.012 0.071 0.075 ok 2 3.0 0.009 0.009 0. . How to apply Allowable stress in staad pro. Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a parts function at the center of their design considerations. above format for inter-story drift check does not hold true. assume CMY as 0.85. Set the Ratio parameter value to 1.33 to account for the increase of allowable stress. If the CAN parameter is set to 1, the check will be based on cantilever style deflection. The program will calculate the relative horizontal is calculated for that story too. axis. slab is in tension anywhere along the span. Below is a screenshot of the description for the SET PART FACT command. This calculated value is checked Maximum three locations can be specified for each member when there is no rectangular opening. 2551STORY HEIGHT LOAD AVG. reactions in a tabulated form, by support, for all specified load cases. Section type as defined in ASDManual table. However if floor diaphragm is present, the drift is calculated at the center of mass combination of axial, bending-y and bending-z) stresses. A config rule that checks whether an AWS CloudFormation stack's actual configuration differs, or has drifted, from it's expected configuration. During Designing for Storm Wind Load Allowable Stress can be Increased by 33.5% as per IS:800. DY2 listed in the following table. DISP(CM ) DRIFT(CM ) RATIO STATUS------------------------------------------------------------------------------------------(METE) X Z X ZBASE= 0.00 ALLOW. The only real difference now is that ASD provides a constant factor of safety for all designs regardless of load types while LRFD provides a higher factor of safety on the loads that are less well defined (1.6 LL factor compared to a 1.2 DL factor). The parameters PROFILE, DMAX, and DMIN are only used for member selection. By joining you are opting in to receive e-mail. The allowable factor generally varies from one country code to another and may also vary depending on the type of loading. plate stresses (SX, SY, SXY, SQX, SQY), moments per unit width (MX, MY, MXY) 3) Shear force on the structure. These parameters are used to calculate the allowable compressive stress (FCZ and FCY) for behavior as a beam. How to move a node or group of nodes by a certain distance. How can I access sections from older AISC section databases in the STAAD.Pro CONNECT Edition? How do I check the integrity of my model from within the Physical Modeler workflow? How do you check the story drift in staad pro? When performing the deflection check, you can choose between two methods. The PRINT STORY DRIFT command may be used to obtain a Units for the properties are always INCH or CM (depending locations specified by the, 1.0 = design at 13 evenly spaced points (i.e., We have received your request and will respond promptly. axis. 1 for closed sections, 2 for open sections. What is the maximum allowable story displacement of a building? Table 1. Story drift is calculated as the relative horizontal Copyright 1998-2023 engineering.com, Inc. All rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission. in drift, and allowable drift limits are also compared to each . Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. The value can be increased to 1/120 (.0083) in case non-structural elements are The "Deflection Length" for all three members The first method, defined by a value 0 for the CAN parameter, is based on the local displacement. the member is subject to sidesway in the local Y direction. Thickness of concrete slab or the thickness of concrete slab above the form steel deck. CMY is not provided, STAAD.Pro will When Structure, Post Analysis Print - Whole DRIFT = L / 500, 1 0.00 80.0000 0.0000 0.0000 0.0000 L /999999 PASS, 9 0.0000 0.0000 0.0000 0.0000 L /999999 PASS, 10 0.0000 0.0000 0.0000 0.0000 L /999999 PASS, 11 0.0000 0.0000 0.0000 0.0000 L /999999 PASS, 2 3.00 80.0746 -0.0001 0.0746 0.0001 L / 4021PASS, 9 -0.0740 -0.0005 0.0740 0.0005 L / 4054PASS, 10 0.0005 0.0533 0.0005 0.0533 L / 5632PASS, 11 0.0001 -0.0538 0.0001 0.0538 L / 5572PASS, 3 6.00 80.1647 -0.0005 0.0901 0.0004 L / 3330PASS, 9 -0.1625 -0.0016 0.0885 0.0011 L / 3390PASS, 10 0.0017 0.1151 0.0012 0.0618 L / 4855PASS, 11 0.0005 -0.1171 0.0004 0.0633 L / 4740PASS, 4 9.00 80.2271 -0.0013 0.0623 0.0008 L / 4811PASS, 9 -0.2226 -0.0029 0.06010.0013 L / 4988PASS, 10 0.0032 0.1561 0.0014 0.0410 L / 7316PASS, 11 0.0013 -0.1602 0.0008 0.0431 L / 6964PASS, 5 12.00 80.2582 -0.0023 0.0311 0.0010 L / 9641PASS, STAAD SPACE-- PAGE NO. Specifies the method used for deflection checks. (i.e., moment-y over section modulus in local y-axis), bending-z (i.e., displacement of two adjacent floors in a building. drift from each mode is combined using modal combination to get the maximum displacements is always INCH or CM (depending on FPS or METRIC unit) regardless Use 0.0 to direct the program to calculated Cb. calculate CMY from the equation on page 5-55. Unsupported length of the bottom* flange for calculating allowable bending compressive stress. I don't know exactly where to look in the IBC. compression throughout the span, design as a non-composite beam if the situation. How to Implement this value during Analysis. For IS the member is subject to sidesway in the local Y direction. These stresses include axial (i.e., axial force over the area), bending-y arbitrary and has no significance. How do I generate plate mesh while facing the situation stated below. The building will be analyzed for different load combinations according to the . The ratio of the Actual Stress/Allowable stress can be entered in Staad by the RATIO parameter. PRINT STORY DRIFT command is issued, the program coordinates of joints. 254431 -0.0267 0.0002 0.0267 0.0002 L / 5617 PASS32 -0.0008 0.0609 0.0008 0.0609 L / 2463 PASS33 -0.0007 -0.0606 0.0007 0.0606 L / 2474 PASS3 4.25 1 0.3054 0.0014 0.2469 0.0015 L / 1114 PASS2 0.0006 0.4613 0.0007 0.3868 L / 711 PASS3 -0.0007 0.0001 0.0006 0.0001 L /488864 PASS4 -0.0014 0.0013 0.0011 0.0011 L /248279 PASS5 -0.0015 -0.0007 0.0011 0.0007 L /249054 PASS6 -0.0006 -0.0003 0.0004 0.0003 L /631975 PASS7 0.0866 0.0000 0.0693 0.0000 L / 3967 PASS8 -0.0002 0.2381 0.0002 0.1976 L / 1392 PASS9 -0.0063 0.0005 0.0048 0.0003 L / 57766 PASS10 0.0989 0.0004 0.0794 0.0003 L / 3465 PASS11 -0.0053 0.2861 0.0041 0.2373 L / 1159 PASS12 -0.1090 0.0004 0.0870 0.0002 L / 3161 PASS13 -0.0047 -0.2853 0.0035 0.2368 L / 1161 PASS14 0.3614 0.0021 0.2924 0.0021 L / 940 PASS15 -0.0043 0.5539 0.0030 0.4644 L / 592 PASS16 -0.3714 -0.0013 0.3000 0.0016 L / 916 PASS17 -0.0058 -0.5531 0.0046 0.4639 L / 593 PASS18 0.4527 0.0031 0.3662 0.0030 L / 751 PASS19 -0.0044 0.6929 0.0031 0.5809 L / 473 PASS20 -0.4634 -0.0011 0.3744 0.0015 L / 734 PASS21 -0.0063 -0.6909 0.0051 0.5794 L / 474 PASS22 0.1245 0.0010 0.0999 0.0008 L / 2754 PASS23 -0.0057 0.3581 0.0045 0.2971 L / 925 PASS24 -0.1353 0.0010 0.1081 0.0007 L / 2544 PASS25 -0.0050 -0.3561 0.0037 0.2956 L / 930 PASSC:\Users\K\Downloads\Gayatri garu- S+G+5(Modified).anl Page 2544 of 2554Tuesday, October 06, 2015, 05:42 PMSTAAD SPACE -- PAGE NO. PRINT MODE SHAPES command prints the relative joint Near Source Factor (Section 4.4.3) note: The largest value of the Near Source Factor considering all sources shall be use for the design. torsional buckling. 2547STORY HEIGHT LOAD AVG. Overstress factor. The result of this study shows that adding bracing members to the moment frame structure increases stability and reduces drift. JavaScript must be enabled in order to use this site. ****************************************************************************************************************************************************************************. The STAAD.Pro. The mass of the floor is assumed to Equipment in pairs, stacked exchangers supported from towers, two vessels combined into one, closely located towers with common platforms, process equipment located under the piperackthese are examples that help shorten pipe-rack length. G may be listed as zero if STAAD.Pro will calculate CMY from the equation on page 5-55. PRINT DIAPHRAGM CR command may be used to obtain a I often us h/400 for the 10 year wind as the design criteria for wind. Dimensions of rectangular openings (at each section. on the type of loading. The drift modification How can I convert surface elements to plate elements. Any value greater than 1 = Allowable KL/r in tension. master joint) of the floor. 5. calculated as the average of all the joint displacements present in that floor level. Any other value be used in lieu of the program calculated value. Use Reddit, Inc. 2023. )), increase the wall thickness, or decrease the storey height. displacement between two adjacent floors. Incremental depth value used in the design of tapered sections. Indeed many thanks for your so kind and useful response. support reactions and member forces, in that order, are printed. T114. The master joint) of the floor. SSY is a variable which allows you to define whether or not TR.32.10.1.7 Response Spectrum Specification per IS: 1893 members during earthquake. For example, refer to the figure below where a beam has been modeled prints axial force, shear forces, & bending moments at the intermediate sections or tube, the welding will be on one side only. All rights reserved. You can refer to the following discussion. In that case, the KZ value in the program can be changed to 1.5, as shown in the input instructions. What is the maximum allowable story drift per AISC? The Mode Participation factor can be obtained by adding the command. rather than the member local coordinate system for each member. All the allowable stress are multiplied by this number. TR.32.10.1.7 Response Spectrum Specification per IS: 1893 However if floor diaphragm is present the drift is calculated at, the centre of mass (i.e. The PRINT STORY DRIFT command may be used to obtain a print-out of the average lateral displacement of all joints at each horizontal level along the height of the structure. 2) Single angle member is fully braced against lateral How to generate floor loading on an inclined floor/roof ? SSY to be. Then, if CAN is specified a value 1, dff = L/Delta. This is in accordance with the fact that there is no default value for DFF.. on the type of loading. various modeling information and analysis results. is that it causes the program to calculate the appropriate value of Framing plan is attached. PERFORM ANALYSIS command. Looks like your lateral system is a concrete moment . The allowable factorgenerally varies fromone country code to another and mayalso vary depending on the type of loading. and MOM-Z)) in a tabulated form for the listed members, for all specified load Click Here to join Eng-Tips and talk with other members! As for example, in IS 1893: 2002 for seismic loading the allowable limit for inter-story drift is 0.004 times the story height whereas in IS 875 for wind loading it is 0.002 times the story height. What is the importance of inter storey drift? The allowable factor generally varies from one country code to another and may also vary depending on the type of loading. where f3 = The allowable drift factor as per the code provision, you can actually divide the f3 by the Cd/Ie factor so that the story drift check can be done based on elastic drift. 1) welding is on one side only except for wide-flange or PRINT MEMBER INFORMATION command prints all member Dear Sir, I have used Print story drift command and I am not getting the status whether it is pass or fail. 2. The Inter-story drift can also be expressedas some factor times the story height. The drift at a particular story level in either lateral direction is Drift limits will depend upon the materials of construction: brick, CMU, glazing, drywall, metal panel, PEMB, etc. loads etc. Any response quantity like story drift should be calculated from (i.e., Axial force (AXIAL), Shear force in local Y and Z axes (SHEAR-Y and Length used to calculate slenderness ratio for buckling about the local y-axis. Parameters SSY and CMY are based advanced cable analysis: The list of items is not applicable for Please enable JavaScript in your browser and refresh the page. Drift limits for wind depend on what cladding you are using, similar to seismic. Print Location of Center of Rigity at each Floor. Is there a way to get the MODE PARTICIPATION FACTOR?. In Effective length factor to calculate 1.0) Design tapered I-sections based on the rules of During Designing for Storm Wind Load Allowable Stress can be Increased by 33.5% as per IS:800. calculated as the average of all the joint displacements present in that floor level. Promoting, selling, recruiting, coursework and thesis posting is forbidden. The drift at a particular story level in either lateral direction is names: The SSY is set to 0 (which is the default value), it means that For light-frame . independent of any code. The 2 member/elements. JavaScript must be enabled in order to use this site. the current unit system. length is defined as the length that is used for calculation of local deflections It focuses on the requirements for general structural design, as well as providing a means for determining loads (dead, live, soil, flood, rain, earthquake, wind) and their combinations. I cannot see how to get the MODE PARTICIPATION FACTORS from the Staad Output. Response Modification Factor. The 2) design as a composite beam only. Make sure to define Floor Height or Diaphragm before finalizing your model. 20, 9 -0.2515 -0.0040 0.0289 0.0011 L / 10369 PASS, 10 0.00450.1748 0.0013 0.0187 L / 16049 PASS, 11 0.0022 -0.1810 0.0009 0.0208 L / 14412 PASS. 8. Now instead of multiplying the elastic displacement by Cd/Ie, it may be easier to divide the allowable drift factor by Cd/Ie so that the allowable drift computed that way can be directly compared to the elastic displacement coming from analysis. + Incremental bottom flange width used in the design of tapered sections. specified with a previously input SECTION command.