Abstract
In most framed structures anticipated deformations in accordance with current codes fall into acceptable limit states, whereas they go through substantial residual deformations in the aftermath of severe ground motions. These structures seem unsafe to occupants since static imminent instability in the immediate post-earthquake may be occurred. Moreover, rehabilitation costs of extensive residual deformations are not usually reasonable. Apparently, there is a lack of detailed knowledge related to reducing residual drift techniques when code-based seismic design is considered. In this paper, reduced beam section connections as a positive approach are taken action to mitigate the huge amount of residual drifts which are greatly amplified by P-Δ effects. To demonstrate the efficacy of RBS, a sixteen-story moment resisting frame is analyzed based on a suite of 8 single-component near field records which have been scaled according to the code provisions. The results are then processed to assess the effects of RBS detailing on drift profile, maximum drift, and residual drift. Besides, a special emphasis is given to estimate overall trend towards drift accumulation in each story in the presence of RBS assembly. A main conclusion is that using this connection predominantly alleviates the adverse effects of P-Δ on amplifying residual drifts.
Highlights
In recent years, the downside of permanent displacements in moment resisting frames (MRFs) has focused researchers’ attention on the issue related to both the control of the structural integrity and resistance conservation against static incipient collapse in the aftermath of earthquake events
Of particular aspect in this study is to acquire knowledge about the variation of maximum and height-wise pattern of residual drifts (RDs) demands in designated frame in the presence of reduced beam section (RBS) assembly subjected to several earthquake ground motions
The influence of so-called RBS connections in reducing the amount of residual drifts mainly owing to P-Δ effects has been investigated
Summary
The downside of permanent displacements in moment resisting frames (MRFs) has focused researchers’ attention on the issue related to both the control of the structural integrity and resistance conservation against static incipient collapse in the aftermath of earthquake events. A huge amount of permanent lateral deformations owing to design-based earthquakes in structures may put residents’ safety at risk even though the repercussions of overall or partial structural damage are not serious. In this case, there is a remote possibility that these impaired structures still remain in operation. The underlying trend toward defining criteria in performance assessment guidelines is based on the limitation of maximum deformations in each structural component to acceptable level. Maximum deformations in conjunction with residual deformations play crucial parts in assessing the seismic performance of structures
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