Risk category iii and iv structures have more stringent drift limits to ensure better performance of the structure and serviceability after a seismic event. The 2006 edition of the ibc is expected to reference the 2005 edition of asce 7. Shelving, racks and wainscoting in such areas shall be of. The final story drift when considering the pdelta effect is calculated as follows. Comparison of the usa, china and japan seismic design procedures guangren yu 1, m. I found two equations in ubc 1997 but they were for story drift.
The allowable story drift should be greater than or equal to the design story drifts for each floor level. A diaphragm is rigid for the purpose of distribution of story shear and torsional moment when the lateral deformation of the diaphragm is less than or equal to two times the average story drift. Estimation of the maximum allowable drift at the top of a shear wall within elastic limits m. Seismic considerations for steel storage racks located in. Estimation of the maximum allowable drift at the top of a. The allowable drift limits placed by asce 716, as shown in table 1, are functions.
Combining nominal loads using allowable stress design 6. When designing for earthquakes, the story drift the relative displacement of adjacent stories must be checked against the ibc prescribed allowable story drifts. Asce 716 provisions for lateral drift determination. Intermediate steel moment frames with unlimited height 3f. The allowable drift of other structures with risk category i and ii is approximately 10 times the allowable drift under wind forces. Combining nominal loads using allowable stress design. The story drift is calculated as the relative elastic displacement of a story to the story below, as shown in figure 1.
Specification for structural steel buildings, allowable stress design, and load. Structure magazine asce 716 provisions for lateral. Minimum design loads for buildings and other structures. Khouri department of civil engineering, lebanese university, lebanon abstract there is a considerable uncertainty regarding the evaluation of the maximum allowable story drift as well as the maximum allowable lateral drift at the top of a building.
Drift limitations in a shear wall considering a cracked. Allowable story drift structuralintl bldg and residl. Pdf interstory drift, the relative translational displacement between two. Pdf a critical assessment of interstory drift measurements. Intermediate reinforced concrete moment frames with permitted height increase. I want to check my results against the ubc or ibc codes i got story displacements from sap2000. The 2000 ibc handbook, structural provisions my latest copy of same has an example where the 1st story height is 17. Story drift limitations are not applicable to storage rack structures with the. Drift limitations in a shear wall considering a cracked section. Minimum design loads for buildings and other structures water.
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