摘要
本文根据结构的极限承载能力,使用框架网络分析法,洋细讨论了钢框架和钢筋混凝土框架的抗震模糊优化设计和可靠性分析问题。为了有效地预防在地震作用下进入塑性工作状态的结构可能出现的动力不安定塑性累加破坏,本文引入了动力安定(Dynamic shakedown)约束。同时提出便于塑性优化成果推广应用的β-结构的概念。通过本文方法的变换,任何平面框架均转化成仅受两个参数(α,β)控制。最后通过模糊可靠性分析,建立不同(α,β)值下的结构可靠度。设计者只需根据自己的设计要求,选择不同的(α,β)值,即可得具有一定可靠度保证的优化设计。 本文根据以上设计思想编制了计算程序(Fortran 77),在VAX11/750机上进行了大量计算,结果是令人满意的。
According to the limit load capacities of structures, the problems of aseismic fuzzy optimal design and reliability analysis of a steel frame and R.C. one is discussed in detail in this paper by using the mesh analysis method. The first theorem of dynamic shakedown is employed as a part of the constraint in order to prevent potential accumulative collapes while a structure works plastic state during earthquake. A new concept 'β-structure' is introduced for the convenience of applying plastic optimal design results to engineering practice. Making use of the method given in this paper, any plane frames might be converted into the structures governed by only two parameters α and β. After analysing the fuzzy reliability, the structure reliabilities corresponding to different sets of α and β are established. So the designer only has to choose a suitable set of α and β according to the design requirements, then the reliability of the structure will be determined.A computing program(in Fortran 77 ) was compiled and a large number of calculations had been done by computer VAX11/750. The results show that the suggested method is quite satisfactory.
出处
《土木工程学报》
EI
CSCD
北大核心
1990年第2期41-50,共10页
China Civil Engineering Journal
