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基于压弯破坏曲面的桥墩可靠性分析

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非对称桥梁结构悬臂施工期间会对下部结构产生较大的不平衡弯矩,为分析钢筋混凝土(Reinforced Concrete,RC)墩柱在不平衡弯矩导致的双轴压弯下的可靠性,提出了基于压弯破坏曲面的可靠性分析方法.该方法使用倪克勤公式作为功能函数,并通过钢筋与混凝土本构关系求解倪克勤公式所需要的轴心受压承载力与单向偏压承载力,将RC墩柱的材料特性、几何特性、所受外部荷载作为随机变量,基于可靠指标物理意义,使用罚函数法将可靠指标求解问题转化为无约束最优化问题,利用遗传退火算法求解RC墩柱的可靠指标.采用该方法对文忠路上跨合肥东站改扩建工程主桥46号桥墩进行可靠性分析,结果表明:在悬臂施工至自重不平衡弯矩最大状态下,P1～P3支墩可靠指标分别为5.44、5.05、5.94;对可靠指标影响程度较大的随机变量依次为结构自重、钢筋强度和混凝土抗压强度,而风荷载对可靠指标影响相对较小.
Reliability Analysis of Bridge Piers Considering Compressive-Flexural Failure Mechanism
The cantilever construction of the asymmetric superstructure of a bridge would induce great unbalanced bending moments in the substructure.To analyze the reliability of the reinforced concrete(RC)piers under biaxial compression induced by the unbalanced bending moments,a reliability analysis method considering the compressive-flexural failure mechanism is proposed.In this method,the Nikitin formula is used as a function,and the constitutive relation between reinforcement and concrete is applied to solve the axial compression bearing capacity and unidirectional eccentric compression bearing capacity.With the material property and geometrical property of the RC piers as well as the external loads as random variables,the issues that should be solved using reliability indexes are converted to unconstrained optimal issues based on the physical meaning of the reliability indexes,and the genetic simulated annealing algorithm is used to obtain the reliability indexes of the RC piers.The method has been applied to the reliability analysis of the pier No.46 of the main bridge of the reconstruction project of Hefei East Station that crosses Wenzhong Road.The results demonstrate that when the cantilever construction was progressed to the stages of self-weight unbalance and maximum bending moments,the reliability indexes of piers P1-P3 are 5.44,5.05 and 5.94,respectively.The impacts of the random variables on the reliability indexes weaken from the self-weight of superstructure to the strength of reinforcement and to the compressive strength of concrete,while the impact of wind loads is relatively minor.

bridge engineeringpierasymmetric cantilever constructioncompressive-flexural failure mechanismreliability analysissensitivity analysisengineering application

王佐才、王建业、辛宇、石岩

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合肥工业大学土木与水利工程学院,安徽合肥 230009

安徽省道路与桥梁检测工程研究中心,安徽 合肥 230009

中铁四局集团有限公司设计研究院,安徽 合肥 230023

桥梁工程 桥墩 非对称悬臂施工 压弯破坏曲面 可靠性分析 灵敏度分析 工程应用

国家自然科学基金国家自然科学基金

5227830152308310

2024

10.20052/j.issn.1671-7767.2024.03.011

世界桥梁
中铁大桥局集团有限公司

世界桥梁

CSTPCD北大核心
影响因子：0.928
ISSN：1671-7767
年,卷(期)：2024.52(3)
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