地震作用下混合桥结合段的极限承载力分析

采用Nishiumi算法分析地震作用下混合桥结合段的极限承载力时,未考虑贯穿钢筋对混合桥结合段剪力键承载力的影响作用,分析出的极限承载力结果与实际结果差异较大。提出新的地震作用下混合桥结合段的极限承载力分析方法。通过分析计算得到栓钉类剪力键和钢筋混凝土柱类剪力键的极限承载力,设计新的极限承载力分析试验,通过设计剪力键试件、试件地震加载和试验测试点安置和测试内容安排,分析地震作用下混合桥结合段剪力键的极限承载力。分析结果说明,所提方法可准确分析地震作用下混合桥结合段剪力键的极限承载力,且分析得到的极限承载力结果与实测结果几乎一致,误差不超过7%。

Ultimate Bearing Capacity of the Joint Sections ofMixed Bridges under Earthquake Action

The effect of through-reinforcing rebar on the bearing capacity of the shear connectors of the hybrid bridge is not considered when the Nishiumi algorithm is used for analyzing the ultimate bearing capacity of the joint sections of hybrid bridges under earthquake action; therefore, the analysis results of ultimate bearing capacity are considerably different from the actual results. A new analysis method has been proposed in this study with respect to the ultimate bearing capacity of the joint sections of a hybrid bridge under earthquake action. Further, the ultimate bearing capacities of the stud-type and the RC column-type shear connectors were obtained through analysis and calculation, and a new ultimate bearing capacity analysis test was designed. Using the design of the shear connector specimens, the seismic loading of the specimens, and the test arrangement, the ultimate bearing capacity of the shear connector in the joint sections of a hybrid bridge was analyzed under earthquake action. The analysis results exhibited that the proposed method can accurately analyze the ultimate bearing capacity of the shear connector in the joint sections of a hybrid bridge under earthquake action; the analysis results were almost the same as the measured results and exhibited a difference of less than 7%.