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本文首次采用广义最优性准则设计钢筋混凝土框架,并建议一种区别有效约束和无效约束的方珐,名为“分组穷举法”。除了考虑规范所要求的一般行为约束和界限约束以外,还特别注意了层间侧移约束和总体侧移约束的计算。 在上述方法的基础上,编制了钢筋混凝土框架优化设计的GHKY-85微电子计算机程序(Fortran 77),把有限单元技术与准则优化技术相结合。对于普通的刚架结构,经过三、四次迭代,只用十分钟机时左右即可获得满意的结果。 文末给出一个工程设计实例。计算结果表明:工程造价比现行设计方法可降低8～16％。
For the first time, this paper adopts the generalized optimality criterion to design the reinforced concrete frame, and proposes a method to distinguish the effective constraint from the invalid constraint, which is named “grouping exhaustion method”. In addition to considering the general behavioral and boundary constraints required by the specification, special attention is also paid to the calculation of the inter-layer lateral migration constraints and the overall lateral migration constraints. Based on the above methods, a GHKY-85 microelectronics computer program (Fortran 77) was designed to optimize the design of reinforced concrete frames, and the finite element technology was combined with the optimization of the criteria. For an ordinary rigid frame structure, after three or four iterations, satisfactory results can be obtained with only about ten minutes of machine time. At the end of the article, an engineering design example is given. The calculation results show that the engineering cost can be reduced by 8 to 16% compared with the current design method.