Need a book? Engineering books recommendations...
Re: IDR[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: IDR
- From: Tom Chiu <Tomchiu(--nospam--at)worldnet.att.net>
- Date: Tue, 20 Jan 1998 15:31:20 -0800
You should do it both ways: 1. Scale the dynamic analysis results by the factor of UBC base shear/Dynamic base shear and do a Code level stress check. 2. Calculate the Dynamic demand/capacity ratios of the members and compare them to acceptable D/C factors for various level of earthquakes, such as MCE, MPE etc. Tri-service manual has a list of acceptable D/C factors that you can use for reference. 3. If you have enough budget, you can also go a step further to do a Push-over analysis to find out the inelastic responses of the structure, to see if there is a collapse potential or not. Good luck, Tom Chiu, SE Tom Long wrote: > > We are designing a new 5 level airport in Manila, 188,000 m2. The type > of construction is concrete flat plate slab with drop panels. We are > using SAP2000 to analyze the structure. After we perform the analysis > and get the seismic forces from the response spectra analysis, should we > apply an IDR to reduce the forces before we compare them with the > capacity of the elements, or should we compare the d/c ratio to a > acceptable factor for the type of structure. > > Or in another case should we follow the UBC and just scale the results > from the dynamic analysis. > > Thank you > > Best regards, > Tom Long > Asia >
- From: Tom Long