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本文以总费用为目标函数,对地震区钢筋混凝土烟囱进行优化设计。设计变量是各设计截面钢筋混凝土筒壁厚度、垂直和水平筋含钢率以及描述烟囱外形的参数。因此,优化了每个计算截面和烟囱形状。为了节省机时,将设计变量分为直接的和从属的,用复形法和满约束设计求解。考虑了烟囱实际受载情况:自重、风荷载、水平和竖向地震力、日照温差、温度效应和P—△效应。国家现行规范中各项规定均得到满足。所以,程序可以直接应用于实际工程设计。计算了两个实例,并与原设计方案进行了比较。
This paper takes the total cost as the objective function to optimize the design of the reinforced concrete chimney in the seismic area. The design variables are the thickness of the reinforced concrete wall of each design section, the steel ratio of the vertical and horizontal tendons, and the parameters describing the chimney shape. Therefore, each calculation section and chimney shape is optimized. In order to save machine time, design variables are divided into direct and subordinate, using complex method and full constraint design. The actual loading conditions of the chimney are considered: dead weight, wind load, horizontal and vertical seismic forces, temperature difference in sunshine, temperature effect and P-△ effect. All the provisions of the current national regulations are met. Therefore, the program can be directly applied to the actual engineering design. Two examples were calculated and compared with the original design.