摘要
基于结构可靠度理论和《公路钢筋混凝土及预应力钢筋混凝土桥涵设计规范》JTGD 62—2004关于最大裂缝宽度的规定,对钢筋混凝土桥梁受弯构件按正常使用极限状态设计的可靠度进行了计算分析,并对比研究了作用效应比、计算模式不定系数、钢筋弹性模量、配筋率、钢筋直径和截面尺寸等随机变量对最大裂缝宽度可靠指标的影响程度。研究表明:最大裂缝宽度计算公式的可靠度基本满足设计要求,可变作用与永久作用的效应比对最大裂缝宽度的可靠度影响很大,而其他因素对最大裂缝宽度的可靠度影响较小。
Based on theory of structural reliability and regulation about the maximal crack width in the ＂code for design of highway reinforced concrete and prestressed concrete bridges and culverts＂,reliability of serviceability limit state for flexual members of reinforced concrete bridges is calculated and analyzed,and the influence of many random variables such as the ratio of action effects,uncertain modulus of calculating model,ratio of reinforcement,diameter of steelbars,section size of members is contrastive studied.Studies show that reliability of the formula for the maximal crack width in the code can satisfy with design and reliability index is more easily influenced by the ratio of action effects compared with other factors.
出处
《结构工程师》
2007年第4期35-39,共5页
Structural Engineers
关键词
钢筋混凝土桥梁
受弯构件
最大裂缝宽度
正常使用状态
作用效应比
可靠度
reinforced concrete bridge,flexual member,the maximal crack width,serviceability limit state,ratio of action effects,reliability
