马宏旺    吕西林
（同济大学土木工程学院结构工程与防灾研究所  上海 200092）

[提要]  基于现行建筑抗震设计规范，把设计变量（荷载、材料强度和几何尺寸）看作随机变量，针对钢筋混凝土框架梁进行优化设计。目的是使设计的梁在满足现行规范要求的基础上，能保持一致的可靠性，同时使设计造价达到最小。文中可靠度分析和优化计算都基于Monte-Carlo随机模拟方法。
[关键词]  钢筋混凝土梁  可靠度  优化  Monte-Carlo法

Seismic optimization design for reinforced concrete beams based on reliability theory following code for seismic design buildings is finished. Design parameters are regarded as random variables. It aims to keep uniform reliability and the mlnlmum cost for designing reinforced concrete beams. The Monte Carlo simulation method is employed to reliability analysis and optimization calculation.
Keywords:  reinforced  concrete  beam; reliability; optimization; Mote-Carlo simulation