在役梁桥弯曲抗力概率模型的确定方法  

The Moment Resistance Probability Model Determination for Existing Beam Bridges

作　　者：王晓明[1] 石雪飞[2] 阮欣[2] 

机构地区：[1]长安大学桥梁工程研究所,西安710064 [2]同济大学桥梁工程系,上海200092

出　　处：《结构工程师》2013年第4期51-56,共6页Structural Engineers

基　　金：中国博士后科学基金(2013M532000);中央高极基才科研业务费长安大学专项资金资助项目(2013G121010)

摘　　要：抗力的计算模式不确定性对在役桥梁的可靠度评估影响显著。按照从本构到结构的分析思路,采用纤维模型进行材料非线性分析以反映梁桥的弯曲承载力;基于检测数据的概率统计结果,采用Monte-Carlo抽样技术模拟梁桥的随机特性,建立了基于纤维模型的实测弯曲抗力统计技术,编制了随机弯曲抗力分析系统(FMRA),能够充分反映既有梁桥弯曲抗力的自身随机特性,可以准确确定评估目标结构自身的计算模式不定性。The uncertainty of resistance calculation has significant influence on reliability assessment. Based on the relationship between constitutive relation and the structural character, the fiber model, which considers material non-linearity, was employed to analyze the moment resistance in this paper. With the probability dis- tribution from field test data, the Monte-Carlo method was used to simulate the stochastic characteristic of beam bridges. A new moment resistance statistical technique based on the fiber model was proposed. The ran- dom moment resistance analysis system （FMRA） was developed. The proposed method can reasonably reflect the moment resistance random characteristics and calculation mode unet^rlnlntv nf ,=~r;~Hn,~ h^om 1..-;A~

关 键 词：计算模式不确定性 纤维模型 Monte—Carlo 可靠度评估 OPENSEES 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]