钢筋砼框架结构的可靠性优化设计研究

提出了一种融结构可靠性分析与结构优化设计于一体的钢筋砼框架结构的可靠性优化设计方法。利用优化技术对传统的概率网络估算技术（PNET）进行改进，通过考虑代表机构之间的相关性，使寻找代表机构和计算结构体系失效概率的方法得到了简化。在分部优化策略的基础上，导出了钢筋砼梁、柱结构可靠性的约束公式，建立了钢筋砼框架结构基于可靠性优化设计的。设计计算结果表明，这种方法实现了结构设计的安全性和经济性的平衡，不仅适用于钢筋砼框架结构，而且还可用于其他钢筋砼结构。

Optimum Design of Reinforced Concrete Frame Structure Based on Reliability

A method of optimum design of rein forced concrete frame structure based on reliability is proposed,which integrates advantages of the reliability analysis and optimum design. The traditional probabilistic network evaluation technique (PNET) is improved by optimization techniques. The effects of correlation between collapse modes are taken into ac count in the estimation of collapse probability, and it is simplified to look for representative modes and to calculate structural collapse probability. On the basis of the distributing optimum strategy, the restricted formula for girders and columns of the reinforced concrete frame structure is derived, and the mathematical model of reliability-based optimum design for the reinforced concrete frame structure is obtained. The calculations show that the new method balances the economical factor with safety in concrete frame stracture design and could also be used in other concrete seructures.