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为了克服传统塑性设计未考虑结构的累积耗能的不足,结合基于能量结构设计方法和塑性设计理论的基本概念,对钢筋混凝土框架结构基于能量的塑性优化设计方法展开研究。由RC框架结构的破坏机构推导得到结构相应的破坏荷载方程,利用能量平衡原理转化成能量约束方程;考虑规范要求和其他约束方程,利用单纯形法对目标函数进行线性规划求得结构构件的最小抗弯需求;根据构件最小抗弯需求对梁柱尺寸和配筋率进行最优化设计。以某二层单跨平面RC框架结构为实例,验证了上述优化方法的合理性和可行性。
In order to overcome the shortcomings of the traditional plastic design without considering the cumulative energy consumption of the structure, the energy-based plastic optimal design method of reinforced concrete frame structure is studied based on the basic concepts of energy structure design method and plastic design theory. The corresponding failure load equation of the structure is deduced from the failure mechanism of RC frame structure, and the energy constraint equation is used to transform the energy constraint equation. Considering the requirements of the specification and other constraint equations, the linear function of the objective function is obtained by using the simplex method to obtain the minimum of structural components Bending demand; optimal design of beam-column size and reinforcement ratio according to minimum bending requirements of components. Taking a two-story single-span RC frame structure as an example, the rationality and feasibility of the above optimization method are verified.