【摘要】 以基于抗震性能设计基本原则-"投资-效益"准则为理论支撑,提出了将多目标遗传算法与延性抗震设计、地震风险相结合的抗震结构集成全寿命抗震优化设计的新方法,建立了规则桥梁圆形单柱RC桥墩多目标全寿命造价优化设计的通用框架。并应用NSGA-II建立了以圆形单柱RC桥墩截面直径、纵筋和箍筋的配筋率为决策变量,以初始造价和地震损失期望为多目标的全寿命造价优化设计模型。计算结果表明:RC桥墩多目标全寿命造价优化设计为投资者提供了更加灵活的初始投资的选择空间,同时NSGA-II也为该优化设计提供了一个较好的算法支持。更多还原

【Abstract】 Based on the cost-effectiveness criterion,a fundamental principle for performance-based seismic design,a new method for optimizing total life-cycle seismic design of bridge piers was put forward with the consideration of multi-objective genetic algorithm,seismic ductility design and earthquake risks. According to which,the general framework of multi-objective total life-cycle cost optimization design for regular reinforced concrete single circular bridge piers was established. On the platform of NSGA-II,a total life-cycle cost optimization model of this pier was constructed with the decision variable as section diameter; the ratios of the longitudinal reinforcement,the lateral reinforcement,the initial cost of the structure and the expectation of earthquake loss as multiple objectives.The calculation results indicate that this method can provide the investors with a more flexible initial investment options,meanwhile NSGA-II can also equip the designers with a better algorithm support for optimization design.更多还原