公路钢筋混凝土梁桥抗震可靠性分析
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摘要
地震可靠度是桥梁抗震研究中的重要问题.采用Monte Carlo方法对按现行结构设计规范和抗震设计规范设计的公路钢筋混凝土桥主梁进行受弯、受剪可靠度分析,对不同烈度地震作用下梁的可靠度进行校核,研究地震发生概率、材料强度、配筋率等因素对抗震可靠度的影响.在此基础上,基于延性设计思想,分析主梁"强剪弱弯"概念设计的可靠性.分析结果表明,按现行规范设计的钢筋混凝土梁具有较大抗震可靠指标,基本满足目标可靠度要求;但在弯剪共同作用条件下,应适当减小弯矩影响系数,以提高"强剪弱弯"概念设计的可靠性.
Reliability analysis is made of reinforced concrete beams designed based on current seismic codes using the method of Monte Carlo.The shear and bend resistant reliability index of the beams under three degrees of seismic intensity is checked,and influences of earthquake occurrence probability,material strength and reinforcement ratio on reliability index are studied.Based on the principle of ductility design,the reliability of the design of strong-shear and weak-bend is analyzed.The results indicate that the beams designed based on the current codes have enough reliability index,but the reliability of strong-shear and weak-bend design is relatively low.It is necessary to reduce the influence coefficient for bend in order to satisfy the design requirements.
Reliability analysis is made of reinforced concrete beams designed based on current seismic codes using the method of Monte Carlo.The shear and bend resistant reliability index of the beams under three degrees of seismic intensity is checked,and influences of earthquake occurrence probability,material strength and reinforcement ratio on reliability index are studied.Based on the principle of ductility design,the reliability of the design of strong-shear and weak-bend is analyzed.The results indicate that the beams designed based on the current codes have enough reliability index,but the reliability of strong-shear and weak-bend design is relatively low.It is necessary to reduce the influence coefficient for bend in order to satisfy the design requirements.
引文
[1]中华人民共和国交通运输部.JTG/T B02-01-2008.公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
[2]贡金鑫,魏巍巍.工程结构可靠性设计原理[M].北京:机械工业出版社,2007:103-112.
[3]Hsin Yu Low,Hong Hao.Reliability Analysis of Direct Shear and Flexural Failure Modes of RC Slabs under ExplosiveLoading[J].Engineering Structures,2002(24):189-198.
[4]陈兵,廖光明,赵雷.基于响应面法的复式钢箱提篮拱桥地震可靠度分析[J].四川大学学报:工程科学版,2008,40(3):44-47.
[5]马宏旺,赵国藩.钢筋混凝土梁抗震可靠度校核以及强剪弱弯设计可靠性分析[J].建筑结构,2000,30(10):3-8.
[6]J Wvan de Lindt,Gin-Huat Goh.Effect of Earthquake Duration on Structural Reliability[J].Engineering Structures,2004(26):1585-1597.
[7]高小旺,鲍霭斌.地震作用的概率模型及其统计参数[J].地震工程与工程振动,1985,5(1):13-22.
[8]中华人民共和国交通部.JTG D62-2004.公路钢筋混凝土及预应力混凝土桥涵设计规范[S].北京:人民交通出版社,2004.
[9]李广慧.高速公路桥梁结构体系可靠性评估[R].北京:中国地震局地球物理研究所,2003.
[2]贡金鑫,魏巍巍.工程结构可靠性设计原理[M].北京:机械工业出版社,2007:103-112.
[3]Hsin Yu Low,Hong Hao.Reliability Analysis of Direct Shear and Flexural Failure Modes of RC Slabs under ExplosiveLoading[J].Engineering Structures,2002(24):189-198.
[4]陈兵,廖光明,赵雷.基于响应面法的复式钢箱提篮拱桥地震可靠度分析[J].四川大学学报:工程科学版,2008,40(3):44-47.
[5]马宏旺,赵国藩.钢筋混凝土梁抗震可靠度校核以及强剪弱弯设计可靠性分析[J].建筑结构,2000,30(10):3-8.
[6]J Wvan de Lindt,Gin-Huat Goh.Effect of Earthquake Duration on Structural Reliability[J].Engineering Structures,2004(26):1585-1597.
[7]高小旺,鲍霭斌.地震作用的概率模型及其统计参数[J].地震工程与工程振动,1985,5(1):13-22.
[8]中华人民共和国交通部.JTG D62-2004.公路钢筋混凝土及预应力混凝土桥涵设计规范[S].北京:人民交通出版社,2004.
[9]李广慧.高速公路桥梁结构体系可靠性评估[R].北京:中国地震局地球物理研究所,2003.
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