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How to model for flexible diaphragm analysis?? Help[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: How to model for flexible diaphragm analysis?? Help
- From: Seaintonln(--nospam--at)aol.com
- Date: Fri, 23 Jul 1999 15:12:57 EDT
In the past I would break a complicated geometry down into smaller blocks and analyze each separately - accumulating the shears at the junction of each block. If I have a structure with skewed walls or if the roof is at a skewed angle from another block, I would have isolated this area and designed it for lateral movement normal to its angle. The '97 code suggests that we split the design into flexible and then rigid (torsion) analysis and compare the results from each - increasing the shear as needed due to torsion. This poses a bit of a problem as it becomes easier to model the whole structure for rigid diaprhagm and shearwall distribution since it produces a point for Center of Mass, Rotation and where the lateral load is to be applied. Is it still valid to break apart the flexible diaphragm analysis to account for the difficulties of skewed sections and leave the Torsional analysis as the complete system? If not, can anyone suggest how to set up the flexible model as a whole and how I would distribute shear to the skewed sections? Would I simply place gridlines in the two major axis runing through the center of skewed walls and taking tributary areas btween gridlines and finding the priniple vectors for each of the skewed walls??? I would appreciate some comments. Thanks Dennis PS. Ultimately I would like to be able to relate this to a spreadsheet tool.
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