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seismic response modification coefficient
Posted by on March 10, 2010 at 12:56 AM. | 1 Comment »

dear sir/madam

I want to know if the "R" is different in ASD or LRFD method, is it depend on load combinations also?


thanks before


Design Load of Knee brace
Posted by on March 5, 2010 at 2:28 PM. | 1 Comment »

For portal frame rafters, what is magnitude of the force subjected to the knee brace resulting from preventing the rafter compression flange to deform?

a friend of mine told me that it’s about 5% of the compression force in the rafter

if it’s x%…then x is the force resulted from the laterlal torsional buckling at the particular point…?

Using Alignment Chart for Portal Frame Rafters and Columns
Posted by on March 5, 2010 at 2:16 PM. | 1 Comment »

I have a tapered Column and a Haunched rafter, how can I get "K" from the Chart while the Column’s moment of Ineria is not uniform along the column and rafter’s length…?