摘要
桥梁结构中各种不确定性的存在加大了可靠性评估的难度,而且对于复杂桥梁往往难以获取相应的功能函数。本文针对上述问题提出基于非概率可靠性理论的响应面界限法,用于求解非概率可靠性指标,评估在役桥梁的可靠性,建立一套适用于在役桥梁的非概率可靠性评估流程。研究以三跨PC连续刚构桥为例,通过确定区间变量参数,利用Midas软件建立桥梁有限元模型;以中跨的跨中截面为控制截面,获取极限弯矩等参数,利用Matlab软件对获取的数据进行处理,并利用提出的响应面界限法求解非概率可靠性指标η,结果为η=1.15762>1,表明在役桥梁处于可靠状态。算例分析表明,基于响应面界限法的非概率可靠性评估方法,便于求解非概率可靠度指标,对在役桥梁进行可靠性评估具有较强的优势。
Uncertainties in bridge structures gave rise to difficultly conducting the non-probabilistic reliability evaluation of existing bridges and difficultly obtaining the performance function for complicated bridge structures. This paper presented the non-probabilistic response surface limit method based on non-probabilistic reliability theory to solve these problems. T he presented response surface limit method was used to evaluate the non-probabilistic reliability of existing bridges by solving non-probabilistic reliability index. Then the non-probabilistic reliability evaluation process for existing bridges was built. Taking a three-span PC continuous rigid frame bridge as an example, by determining the interval variables,the finite element model was built utilizing the Midas software. The middle section of the middle span was selected as the control section,the ultimate bending moment and other parameters were obtained,and the data obtained was processed using the Matlab software. The non-probabilistic reliability index was solved and that was η=1.15762〉1, therefore,the existing bridge was reliable. T he illustrative example showed that, using the presented non-probabilistic reliability evaluation methods was convenient to solve non-probabilistic reliability index, and there was a great advantage in estimating the non-probabilistic reliability of existing bridges.
作者
边晓亚
陈旭勇
陈谦
樊建平
BIAN Xiao- ja;CHEN Xu- yong;CHEN Qian;FAN Jian-ping(School of Civil Engineering and Architecture,Wuhan Institute of Technology,Wuhan 430074,China;Wuhan H anyang Municipal Construction Group Corporation,Wuhan 430050,China;School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《土木工程与管理学报》
北大核心
2018年第4期107-111,共5页
Journal of Civil Engineering and Management
基金
国家自然科学基金(51708428
51408444)
武汉工程大学校内科学基金研究项目(K201723)
关键词
桥梁
非概率
可靠性
界限法
响应面
bridge
non- probabilistic
reliability
limit method
response surface
