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首页> 外文期刊>Advances in Structural Engineering >Reliability-based performance design optimization for seismic retrofit of reinforced concrete buildings with fiber-reinforced polymer composites
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Reliability-based performance design optimization for seismic retrofit of reinforced concrete buildings with fiber-reinforced polymer composites

机译：基于可靠性的纤维增强聚合物复合材料钢筋混凝土建筑抗震性能设计优化

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摘要

Fiber-reinforced polymer composites can be externally bonded to reinforced concrete members which provide an effective seismic retrofit strategy for reinforced concrete structures. For seismic retrofit of a complex building structure, due to the large number of structural members, an optimum design which ensures the use of the minimum amount of fiber-reinforced polymer to achieve a given level of seismic performance is highly desirable for economic reasons. In addition, such an optimum design approach is best built on a probabilistic basis so that various sources of uncertainties in the design process can be appropriately accounted for. This work therefore studies an efficient reliability-based optimization approach for the seismic retrofit design of reinforced concrete structures using fiber-reinforced polymer composites. The structural performance is assessed at the system level using nonlinear pushover analyses. In the proposed approach, the inelastic interstory drift ratios are modeled as indeterministic variables to consider the uncertainties of earthquake loading. By contrast, the thickness of the fiber-reinforced polymer jacket is considered as a deterministic design variable. The reliability-based design approach is formulated by minimizing fiber-reinforced polymer cost subject to prescribed structural reliability constraints. Using the results of nonlinear static pushover analyses and reliability analyses, the reliability index constraints are explicitly formulated with respect to the deterministic design variables based on the virtual work principle as well as Taylor series expansion. A numerical optimality criteria method is derived and programmed to solve this reliability-based nonlinear retrofit design optimization problem. A design example is included to illustrate the application of the new optimization approach.
机译：纤维增强的聚合物复合材料可以从外部粘结到钢筋混凝土构件上，从而为钢筋混凝土结构提供了有效的抗震改造策略。对于复杂建筑结构的抗震改造，由于大量的结构构件，出于经济原因，非常需要确保使用最小量的纤维增强聚合物以达到给定水平的抗震性能的最佳设计。另外，这种最佳设计方法最好在概率的基础上建立，以便可以适当考虑设计过程中各种不确定性来源。因此，这项工作研究了一种有效的基于可靠性的优化方法，用于使用纤维增强聚合物复合材料的钢筋混凝土结构的抗震加固设计。使用非线性推覆分析在系统级别评估结构性能。在该方法中，将非弹性层间位移比建模为不确定变量，以考虑地震荷载的不确定性。相比之下，纤维增强的聚合物护套的厚度被认为是确定性的设计变量。基于可靠性的设计方法是通过在规定的结构可靠性约束下使纤维增强的聚合物成本最小化来制定的。利用非线性静力推覆分析和可靠性分析的结果，基于虚拟工作原理以及泰勒级数展开，针对确定性设计变量明确制定了可靠性指标约束。推导并编程了数值最优准则方法，以解决基于可靠性的非线性改造设计优化问题。包含一个设计示例，以说明新优化方法的应用。

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