For example, when using UBC-97, clause 1629.9.3 and tables’ 16-L or 16-M should be satisfied.
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Building Irregularity checks are depending on the code that we are using, although there are similarities. The designer should review the structural arrangement of the structural elements to ensure that the code requirements against building irregularity will be satisfied. Wind Drift should be check according to the limitations 1/400 to 1/600 of the story height (ASCE 7-10, CC.1.2) considering the service load combination, 1.0Dead Load + 0.50 Live Load +0.70 Wind Load as specified in ASCE 7-10 commentary CC-3.
For detailed seismic drift limitations, kindly visit the sections in the code that are mentioned above. The allowable story drift should be greater than or equal to the design story drifts for each floor level. Under Drift Check, there are two checks to consider:Ĭalculated story drift using the Maximum Inelastic Response Displacement, Δm shall be in accordance with UBC 97, Section 1630.10.2 and or to Table 12.12-1 of ASCE 7-10.
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READ ALSO: 2 Methods on How to Scale Base Shear in ETABS Values in excess of 0.1 indicate the probability of building collapse and failure in design. The values larger than 0.06 indicates severe damage while the values larger than 0.025 indicates that the damage is serious enough and already a serious threat to human safety. This means that the greater the drift, the greater the damage in the structure.
The difference between the roof and floor displacement is called inter-story drift.įor example, for a 10-meter high story, an inter-story drift of 0.10 indicates that the roof is displaced 100 millimeters in relation to the floor below. Stay tuned for another article on how scaling is accomplished in ETABS to be posted soon.ĭeflection Control is specified in terms of Story Drift which is defined as the lateral displacement of one level relative to the level above or below or simply the difference of the deflections at the center of mass at the top and bottom of the story under considerations. You may read the detailed principle of scaling or balancing on our previous article, Scaling of Base Shear Results from Static and Dynamic Analysis. To properly distribute the forces, the base shear obtains or calculated from the dynamic analysis should be reduced to a certain percentage of the base shear results that is determined from the static force procedure. Scale Factors or Balancing of Response Spectrum READ ALSO: 10 Checklists in Reviewing ETABS Modelįor further information, the summary of seismic provisions considering base shear and overturning effect as per UBC 97 and ASCE 7-10 has been discussed in previous articles, Seismic Analysis: UBC 97-Provisions and Seismic Analysis: ASCE 7 and IBC 12 Provisions respectively.ģ.