【作者】 李法雄；

【导师】 聂建国；

【作者基本信息】 清华大学 ， 土木工程， 2011， 博士

【摘要】 组合梁斜拉桥在我国大跨桥梁建设中得到广泛应用，但对其空间受力行为及时变效应的研究尚不完善。本文综合试验研究、理论分析和数值模拟等方法对组合梁斜拉桥空间受力行为及时变效应进行了深入的研究，提炼出一套较为系统的简化设计方法，并实现了组合梁斜拉桥全过程空间受力行为分析。论文主要工作包括以下7个方面：1）建立了能够同时考虑翼板剪力滞效应和界面滑移效应的实腹型组合梁在弯矩和轴力作用下的剪力滞理论分析模型，理论模型和解析解得到了有限元方法和试验结果的有效验证（第2章）。2）提出了波形钢腹板组合梁斜拉桥方案，并建立了能够考虑腹板剪切变形的波形钢腹板梁理论模型。在此基础上，引入翼板翘曲位移函数，建立了能够同时考虑翼板剪力滞效应和腹板剪切变形的波形钢腹板组合梁在弯矩和轴力作用下的剪力滞理论分析模型（第3章）。3）完成了3个不同截面形式组合梁斜拉桥主梁节段模型空间受力性能静力加载试验（第4章）。4）在试验研究、理论分析和数值模拟基础上，从构件和体系两个层次提炼出一套组合梁斜拉桥主梁空间受力行为实用设计方法（第5章）。5）采用混凝土徐变分析逐步递推计算方法，将一维混凝土收缩徐变分析拓展到三维应力空间，基于ABAQUS软件平台自主开发三维混凝土收缩徐变分析程序3DTDAP，并通过已有试验和工程实例分析，验证了分析程序的有效性（第6章）。6）基于ABAQUS软件平台自主开发斜拉索多次张拉调整用户子程序，结合三维混凝土收缩徐变分析程序，实现了组合梁斜拉桥全过程空间受力行为分析，并对组合梁斜拉桥在三个阶段的主梁空间受力行为进行探讨，验证了组合梁斜拉桥空间受力行为实用设计方法（第7章）。7）基于斜拉桥施工全过程分析模型，对实腹型组合梁和波形钢腹板组合梁两种主梁形式斜拉桥时变行为进行探讨，实现了按龄期调整有效弹性模量法在组合梁斜拉桥时变行为分析中的应用，并对简化分析结果进行了比较验证（第8章）。本论文属于国家自然科学基金资助项目（项目编号：50438020）。更多还原

【Abstract】 Composite cable-stayed bridges are widely used in China, but the researches ontheir spatial structural behavior and time-dependent effect are not fully addressed. Bymeans of specimen tests, theoretical and numerical analyses, the spatial structuralbehavior and time-dependent effect of composite cable-stayed bridge are studied, andthen a series of complete practical design methods are proposed.The main work of this thesis including7concepts:1) A theoretical modelconsidering both shear lag in the flange and slip effect on the interface ofsteel-concrete composite girder is established, and then the theory model andanalytical solutions are verified by test results and finite element analysis(chapter2).2) With fully recognized of structural behavior of corrugated web, a new type of cablestayed bridge with composite girder consisting of corrugated web is proposed, andthen beam model considering shear deformation in the web is established. Byintroducing warping displacement function, the theoretical model considering bothshear lag in the flange and shear deformation in the web of composite girder withcorrugated webs is established (chapter3).3) Tests of three composite girders withdifferent sections under the combination loads of bending moment and axial force areconductted (chapter4).4) According to the works of specimen tests, theoretical andnumerical analyses, a series of practical design methods of composite girder incomposite cable stayed bridge are proposed in component and structural systemlevels (chapter5).5) By introducing gradually recursive calculation method inconcrete creep analysis, three-dimension concrete creep and shrinkage analysisprogram are developed based on the user subroutine of finite element analysissoftware ABAQUS, and then the reliability of the program is verified by comparingwith the existing tests and engineering example analysis (chapter6).6) Byembedding stayed cables multi-drawing program and concrete creep and shrinkageanalysis program into three-dimension cable stayed bridge spatial model, the complexspatial structural behavior of composite cable stayed bridge in all stages are studied,and then practical design methods of composite girder are proved to be reliable(chapter7).7) Considering the whole construction stages, the time-dependent effects of composite cable stayed bridges with different types of girders are studied. Then,the age-adjusted effective modulus method is introduced to analysis time-dependenteffect of composite cable-stayed bridge, which may give a more simplified processduring preliminary design stage (chapter8).This dissertation is sponsored by National Natural Science Foundation ofChina (NSFC) program (#50438020).更多还原