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Base-isolated structures for shake table tests were initially designed based on the component test results and the equivalent lateral force procedure.
The results show that increased diaphragm flexibility leads to inter-story drifts that are dramatically large and inertial forces that are considerably different from calculated values using the equivalent lateral force procedure described in current seismic codes.
Therefore, the objective of this study is to evaluate the performance of DDBD on a regular concrete special moment resisting frame compared to two varians of FBD, equivalent lateral force procedure and response spectrum analysis.
Current seismic codes allow regular structures to be designed using an equivalent lateral force procedure if the interstory drifts calculated on the basis of the design lateral forces are less than the specified allowable story drifts.
For this structure, comparable seismic loads are specified in Canada and Chile, whereas significantly lower seismic effects are prescribed in the U.S. In all countries, use of the dynamic (response spectrum) analysis method resulted in lighter and more flexible structures compared to the equivalent static force procedure.
Therefore, the modal response spectrum analysis appropriately considering the contribution of higher modes, rather than the equivalent lateral force procedure only considering the fundamental mode, is suggested for the preliminary design of mid-story isolated buildings prior to performing nonlinear responses history analyses.
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Three models for the track and two loading procedures (the Moving Forces procedure and the Train Structure Interaction procedure) were used.
The folding of the structure during incubation is probed by the next round of the force-ramping procedure (force-probing).
Among these were the benefits of the reduction-in-force procedures established by civil service regulation.
Sometime this summer, Hayden plans to publish reduction-in-force procedures to deal with the naysayers, if need be.
These benefits include that set forth in 5 U.S.C. § 7513(a) (1976 ed., Supp. IV): "[A]n agency may take [adverse action] against an employee only for such cause as will promote the efficiency of the service". [p788] Similarly, his veteran status entitled Fitzgerald to the protection of the reduction-in-force procedures established by civil service regulation.
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