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Efficient optimum seismic design of reinforced concrete frames with nonlinear structural analysis procedures

机译：具有非线性结构分析程序的钢筋混凝土框架的高效最佳地震设计

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摘要

Performance-based seismic design offers enhanced control of structural damage for different levels of earthquake hazard. Nevertheless, the number of studies dealing with the optimum performance-based seismic design of reinforced concrete frames is rather limited. This observation can be attributed to the need for nonlinear structural analysis procedures to calculate seismic demands. Nonlinear analysis of reinforced concrete frames is accompanied by high computational costs and requires a priori knowledge of steel reinforcement. To address this issue, previous studies on optimum performance-based seismic design of reinforced concrete frames use independent design variables to represent steel reinforcement in the optimization problem. This approach drives to a great number of design variables, which magnifies exponentially the search space undermining the ability of the optimization algorithms to reach the optimum solutions. This study presents a computationally efficient procedure tailored to the optimum performance-based seismic design of reinforced concrete frames. The novel feature of the proposed approach is that it employs a deformation-based, iterative procedure for the design of steel reinforcement of reinforced concrete frames to meet their performance objectives given the cross-sectional dimensions of the structural members. In this manner, only the cross-sectional dimensions of structural members need to be addressed by the optimization algorithms as independent design variables. The developed solution strategy is applied to the optimum seismic design of reinforced concrete frames using pushover and nonlinear response-history analysis and it is found that it outperforms previous solution approaches.
机译：基于性能的地震设计提供了对不同水平的地震危害的结构损伤的控制。尽管如此，处理钢筋混凝土框架最佳性能的地震设计的研究数量相当有限。该观察可能归因于需要非线性结构分析程序来计算地震要求。钢筋混凝土框架的非线性分析伴随着高计算成本，需要先验的钢筋知识。为了解决这个问题，以前的钢筋混凝土框架最佳性能的地震设计研究使用独立的设计变量来代表优化问题中的钢筋。这种方法驱动到大量的设计变量，其呈指数级倍率地缩小优化算法达到最佳解决方案的能力。本研究介绍了钢筋混凝土框架最佳性能的地震设计量身定制的计算有效手术。所提出的方法的新颖特征是它采用了一种基于变形的迭代程序，用于设计钢筋混凝土框架的钢筋，以鉴于结构构件的横截面尺寸，以满足其性能目标。以这种方式，只需要通过优化算法作为独立设计变量来解决结构构件的横截面尺寸。使用推送和非线性反应历史分析应用开发的解决方案策略应用于钢筋混凝土框架的最佳地震设计，并发现它优于先前的解决方案方法。

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