波折钢腹板内衬混凝土组合梁力学性能与设计方法研究

波折钢腹板组合梁以其优越的力学性能: 自重轻；预应力施加效率高；施工周期短；受力合理；良好的抗震性能等广泛应用于桥梁工程。 . 提出波折钢腹板内衬混凝土构造提高组合梁负弯矩区的结构性能。采用模型试验、理论分析、数值模拟相结合的方法系统研究波折腹板内衬混凝土组合梁的承载性能以及传力机理。由于钢腹板剪切屈曲以及翼缘局部屈曲受内衬混凝土约束，波折腹板组合梁剪切与弯曲承载性能大大提高。基于模型试验，建立考虑材料与接触非线性的实体有限元模型，分析研究波折腹板内衬混凝土梁几何与材料参数、以及波折腹板与内衬混凝土连接程度对承载性能的影响。最终提出建立波折钢腹板内衬混凝土组合结构的刚度与强度计算理论与设计方法，完善波折钢腹板组合桥梁设计理论与方法，为波折腹板组合结构桥梁在我国的应用与推广提供理论基础和依据。

The composite girders with corrugated steel webs have excellent properties, such as lightness, efficiency of introducing prestress forces, short construction period, optimum force distribution, good seismic performance, and aesthetics appearance etc., which have greatly promoted the application in bridge engineering. . A new type of partially encased composite I-girder with corrugated steel web has been proposed to improve the structural performance of continuous girders under hogging moment. The mechanical behaviors of such partially encased composite I-girders under shear and flexural loading have been experimentally and analytically investigated. The partially encased composite girders has superior shear and bending strength compared to steel I-girders, since shear bucking of steel web and local buckling of flange are restricted by concrete encasement. A three dimensional finite element model with material and contact nonlinearity is established and verified by the experiments. Subsequently, a parametric study is carried out to examine the effects of geometric and material properties on the mechanical behaviors which include corrugation, height, thickness, connection degree between steel web and concrete encasement. Finally, calculation models of stiffness and strength for partially encased composite girder with corrugated web are proposed. In addition, the predicted shear, bending strength and shear-bending interaction curve are compared with the experimental and numerical results to prove the accuracy and applicability of those proposed calculation models. All the findings including calculation models, design methods and curves from experimental, numerical and analytical studies may provide reference for design and construction of composite bridges with corrugated steel webs.