基于可靠性分析的混凝土结构耐久性优化设计  

Reliability-based optimum design of durability about concrete structures

作　　者：周建民[1] 

机构地区：[1]上海铁道大学土木建筑学院,上海200331

出　　处：《铁道学报》2000年第B05期57-61,共5页Journal of the China Railway Society

摘　　要：耐久性设计是一个具有重大经济意义的研究课题。本文引入时变广义可靠度概念并建立相应的计算模式 ,提出了基于可靠性分析的耐久性优化设计方法。对 1 6 m跨度铁路混凝土桥梁标准设计 (图号 :专桥 1 0 2 3)进行的耐久性优化设计结果表明 :影响耐久性的主要因素是气候环境、混凝土质量和保护层厚度 ;应根据不同的环境情况 ,按使用寿命划分不同的保护层厚度取值范围 。Research for durability design about concrete structures has economic significance. The concept of time dependent reliability and the calculating model are proposed in this paper.In addition, the durability optimum design method based on reliability analysis is suggested also. By the result of optimizing for standard design of 16 m span railway concrete bridge (drawing number:1023), the following conclusions are obtained:the climate, the property of concrete and the depth of cover have a great influence on durability;the depth of cover should be chosen according to environmental condition and demand of service life, and the adoption of the maximum allowable depth of cover is an optimum economic alternative.

关 键 词：可靠性 混凝土耐久性 使用寿命 优化设计 

分 类 号：U448.33[建筑科学—桥梁与隧道工程] U442.52[交通运输工程—道路与铁道工程]