| 考虑弯剪耦合作用的梁桥可靠度评估 |
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| 引用本文： | 王晓明.考虑弯剪耦合作用的梁桥可靠度评估[J].同济大学学报(自然科学版),2012,40(3):0338-0343. |
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| 作者姓名： | 王晓明 |
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| 作者单位： | 1. 长安大学桥梁系,陕西西安,710064
2. 同济大学桥梁系,上海,200092 |
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| 基金项目： | 西部交通建设科技项目(200731882231) |
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| 摘 要： | 在役梁桥的评估需考虑弯剪耦合作用.将抗力与效应由一元随机变量拓展成二元随机变量,引入美国AASHTO规范采用的修正压力场理论,建立弯剪耦合抗力与弯剪复合效应的概率模型,提出了考虑弯剪耦合作用的可靠度评估方法.算例分析表明,对于复合效应中弯矩、剪切分量都较大的截面,其失效机制是弯剪耦合破坏,传统方法计算结果偏不安全,有必要采用考虑弯剪耦合作用的可靠度评估方法.
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| 关 键 词： | 钢筋混凝土梁桥 弯剪耦合 二元随机变量 可靠度评估 修正压力场理论 |
| 收稿时间： | 2010/5/14 0:00:00 |
| 修稿时间： | 1/7/2012 12:00:00 AM |
Beam Bridges Reliability Assessment considering Moment-shear Coupling Effect |
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| Wang xiaoming.Beam Bridges Reliability Assessment considering Moment-shear Coupling Effect[J].Journal of Tongji University(Natural Science),2012,40(3):0338-0343. |
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| Authors: | Wang xiaoming |
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| Institution: | 1.Department of Bridge Engineering,Changan University,Xi’an 710064,China;2.Department of Bridge Engineering,Tongji University,Shanghai 200092,China) |
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| Abstract: | Based on the modified compression field theory(MCFT) adopted in AASHTO load and resistance factor design(LRFD) specification,the probability models of moment-shear coupling resistance and effect were established. The resistance and effect variables were expanded from unary random variables into binary random variables. A new reliability assessment method was proposed by taking moment-shear coupling effect into consideration.The example analysis shows that for the cross-section bearing both larger moment and shear effect component,the failure mechanism is the moment-shear coupling failure,the traditional method results in unsafe conclusion,and it is necessary to consider the moment-shear coupling effect during reliability assessment. |
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| Keywords: | reinforcement concrete(RC) beam bridges moment shear coupling binary random variable reliability assessment modified compression field theory (MCFT) |
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