中国公路桥梁承载能力评定规程的可靠性水准.pdf

第32卷第4期
公路交通科技
Vol 32 No 4
2015年4月
Journal of Highway and Transportation Research and Development
Ap.2015
doi:10.39%69/jisn.1002-0268.2015.04.01
中国公路桥梁承載能力评定规程的可靠性水准
张劲泉,冷艳玲,李万恒,程寿山
(交通运输部公路科学研究院,北京10008
摘要:分析了我国公路桥梁永载能力评定规程的可靠性水准,明确了提高该规范可靠性水准的需求及方法;借鉴美
国基于可拿性的规范的相关研究所用的方法理论,推导出了计算規范隐含可靠度的公式,并采用方法计算了我
国现行公路桥梁设计规范的强度极状态方程的隐含可靠度,计算的隐可靠度值与规范規定的目标可靠度值较吻
合;然后应用被方法,计算出了我国公路桥梁评定规范度极限状态方程的隐含可靠度;最后,比较了中、美公路
桥梁承截能力评定方法的可靠性水准、适用范国、评定基准期、目标可靠度、抗力模型及荷载模型,对我国公路桥
梁承栽能力评定规程的进一步完善有指导意义。另外,本文分析了美国統计桥梁历史失效概率的方法。
关词:桥梁工程;可靠性水准;校准;永载能力评定;荷載抗力因子
中图分类号:U4411.2
文献标识码:A
文章编号:1002-0268(2015)04-0059-05
Reliabilty Level of Load-bearing Capacity Evaluation Specification of
Highway Bridges in China
ZHANG Jin-quan, IENG Yan-ling, L Wan-heng, CHENG Shou-shan
Research Institute of Highway, Miis of ranspo, Beijing 1088, China)
Abstract We analyzed the reliability level of current highway bridge load-bearing capacity evaluation code of
China, specified the requirement and the methods to upgrade the reliability level of this code. Using the
method and theory used in the related researches of American reliability-based code for reference, we derived
a formula to calculate the implied reliability index of the curent code, and calculated the implied reliability
index of the strength limit state equation in the current Chinese highway bridge design code with this formula
which is complied with the target reliability index of the same code. Then, we calculated the implied
reliability index of the strength limit state equation in the current load-hearing capacity evaluation code with
this method. At last, we curnpared the reliability levels scopes, time periods, target reliability indexes
resistance modes and load modes of the Chinese load-bearing capability code and American load rating code
which would serve as a guidance to upgrade the current highway bridge load-bearing capability code. We also
analysed the procedures by which American codes defined the historical failure rates of highway bridges
Key words: bridge engineering; reliability level; calibration; load-bearing capacity evaluation; load and
resistance tactor
材料性能、构件几何参数等)均为随机变量,然而,
0引言
由于该规程没有明确其目标可靠度,尚属于半经验
我国公路桥梁承载能力评定方法基于荷载抗性半可靠性的评定规程。本文分析了我国公路桥梁
力因子评定方法,方法中所涉及的各参数(如荷载、承载能力评定规程(以下简称“现评定规程”)的
收稿时间:20l4-07-02
基金项目:交通运输部建设科技项目(2013318223040)
作者简介:张劲泉(1963-),男、江苏泰州人,研究员.(g.zhang@rob.cn
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