基于逆可靠度法的钢管混凝土拱肋稳定性分析  

Inverse Reliability Analysis for Stability of Arch Ribs of CFST Arch Bridges

作　　者：袁腾文 YUAN Tengwen(The Communications Planning Surveying and Designing Institute of Shanxi Province,Taiyuan 030012,China)

机构地区：[1]山西省交通规划勘察设计院,太原030012

出　　处：《结构工程师》2020年第1期54-59,共6页Structural Engineers

摘　　要：针对钢管混凝土拱肋稳定性评估指标单一的问题,提出了一种基于逆可靠度分析的拱肋稳定安全系数评估方法。该方法通过一次逆可靠度算法将稳定安全系数和可靠指标联系起来,求得的稳定安全系数满足预先给定的目标可靠指标,同时考虑结构中存在的不确定性因素,从而建立起具有目标可靠指标和稳定安全系数的拱肋稳定性评估方法。运用所提方法对一工程实例进行计算,并进行参数分析。计算结果表明,随着目标可靠指标的逐渐增加,拱肋稳定安全系数呈递减趋势;折减系数对拱肋稳定安全系数的影响显著,钢材强度对拱肋稳定安全系数的影响相对较小。Considering shortcoming of single index in assessing stability of concrete-filled steel tubular arch ribs,an inverse reliability based evaluation method for stability safety factor of the arch ribs was proposed.This method was derived based on the inverse first-order reliability method(IFORM)being capable of linking the structural stability safety factor with the structural reliability index,where the stability safety factor obtained satisfies the predetermined target reliability index,taking into account uncertainties existing in the structure.Thus,a method for evaluating stability of arch rib with target reliability index and stability safety factor was established.Feasibility of the method was checked in a typical construction example.The results show that increasing the target reliability index gradually,the stability safety factor of the arch rib appears a decreasing trend;the reduction coefficient has a significant effect on the stability safety factor of arch rib,and the effect of steel strength on the stability safety factor of arch rib is relatively small.

关 键 词：稳定安全系数 理论分析 钢管混凝土拱肋 逆可靠度法 目标可靠指标 

分 类 号：U441[建筑科学—桥梁与隧道工程]