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建立构件的优化准则是钢筋混凝:匕结构抗震最优设计的一个基本步骤。在地震区,设计钢筋混凝土结构时可以采用较高的含钢率以及较小的结构断面,以减轻自重并确保结构的韧性。按此目的,本文采用 Lagrange 乘子方法推导了钢筋混凝土结构构件的优化准则。文中采用梁、柱的含钢率与截面高度作为结构构件的设计变量,求出满足钢筋混凝土结构设计规范“TJ10-74”给定约束条件下使钢筋与混凝土费用之和为最小时的最优解。将所得的结果应用于一座位于八度地震区的热电厂主框架,说明本文所介绍的优化方法具有较大的经济意义。
The optimization criteria for establishing the component is a basic step of the seismic optimum design of the concrete structure. In seismic zones, higher steel rates and smaller structural sections can be used when designing reinforced concrete structures to reduce their own weight and to ensure structural toughness. For this purpose, the Lagrange multiplier method was used to derive the optimization criteria for reinforced concrete structural members. In this paper, the steel and beam heights of beams and columns are used as the design variables of the structural members, and the sum of the costs of reinforcing steel and concrete under the given constraint conditions of “TJ10-74” satisfying the design specifications for reinforced concrete structures is minimized. Optimal solution. The results obtained are applied to a main frame of a thermal power plant located in the 8.0-degree seismic zone, which shows that the optimization method described in this paper has great economic significance.