复合主拱圈加固石拱桥弹塑性本构关系研究  

Research on elastic-plastic constitutive relation of stone arch bridge reinforced by composite main arch circle method

作　　者：乔文靖[1,2] 宋一凡[1] 陈书生[1] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]西安工业大学建筑工程学院,陕西西安710032

出　　处：《广西大学学报（自然科学版）》2013年第1期100-105,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：国家交通运输部西部交通建设项目(2011318812970);中央高校基本科研业务专项资金项目(CHD2011JC195)

摘　　要：根据复合主拱圈加固石拱桥时截面以承受轴力为主,弯矩较小的受力特点,基于原拱圈和加固层共同工作、协调变形原理,针对加固后的石拱桥,推导出适合有限元分析的混凝土与砌体理想弹塑性复合材料的本构关系。对某复合主拱圈加固的石拱桥应用推导的本构关系,采用有限元软件ANSYS建立了数值分析模型,并对该本构关系进行校核检验。结果表明:采用混凝土与砌体理想弹塑性复合材料非线性计算结果和混凝土与砌体分开的两种材料非线性计算结果非常接近,复合材料非线性的计算值比两种材料非线性的计算值小,轴力小3%～5%,弯矩小7%～8%。给出的混凝土和砌体的理想弹塑性本构关系在复合主拱圈加固石拱桥时有足够的可靠性,可供同类桥梁结构分析应用。Because all sections of stone arch bridge reinforced by composite main arch circle method bear axial forces and only bear very small bending moment, the constitutive relation of an ideal elas- tic-plastic structure of concrete and masonry, which can be applied to finite element analysis is de- duced based on the theory that original arch and reinforced layer can work together and coordinate deformation. This constitutive relation is applied to reinforced stone arch bridges, and it is verified by finite element models that are established with ANSYS software. The results show that the calcu- lated nonlinear value of ideal elastic-plastic composite material of concrete and masonry is close to that of concrete and masonry when they are analyzed respectively. The calculated nonlinearity value of the composite material is smaller than that of the two materials： axis force can be reduced by 3% to 5%, and bending moment can be reduced by 7% to 8%. The constitutive relation of ideal elastic- plastic composite material of concrete and masonry is reliable, and can be applicable in the analysis of the same kind of bridge structures.

关 键 词：复合主拱圈 石拱桥 有限元 本构关系 材料非线性 

分 类 号：U442.53[建筑科学—桥梁与隧道工程]