中文摘要：

为研究钢-混凝土结合段全过程受力性能，结合东平大桥实桥，根据等效原则设计并完成了一榀钢-混凝土结合段模型试验。模型比例采用1：2．5，混凝土梁肋部分为T形截面，结合段采用钢箱混凝土横粱过渡。钢与混凝土粘结界面采用PBL剪力连接件构造，并辅以纵向预应力筋共同作用。试验过程进行了静力、疲劳和破坏3个阶段的加载。试验结果表明：设计荷载作用下，结合段具有良好的强度和刚度，应力水平较低；疲劳荷栽作用下，结合段的混凝土表层会有微小裂纹出现，但结构整体刚度依然良好；破坏荷载相对于设计荷载具有较高的安全储备。

英文摘要：

To study the whole process mechanical behavior of steel and concrete joint sections, in accordance with the actual Dongping Bridge and on the principle of equivalence, the model test of a steel and concrete joint section was designed and carried out. The scale of the model is 1 ： 2.5. The part of the concrete girder rib is the T-shape section and the transition at the joint section is the concrete-filled steel box cross beam. At the connection interface of the steel and concrete, the PBL shear connectors were used and the longitudinal prestressing tendons were arranged as well to join in the action of the shear connectors. In the model test, three stages of the static load, fatigue load and failure load were applied. The results of the test indicate that under the designed load, the joint section has good strength and rigidity and the stress levels are low. Under the fatigue load, microcracks appear in the surface of the concrete of the joint section, however, the global rigidity of the structure is still all right and relatively to the designed load, the failure load has rather high safety margin.