Focusing on a multi-connected simply supported-to-continuous small box girder bridge,this paper comprehensively analyzed the seismic resistance of the small box girder from the aspects of calculation scale determination,seismic fortification category and objective,checking calculation content and method,seismic performance and law,etc.The results showed that under E1 and E2 earthquakes,the most unfavorable part of the pier force was at the pier bottom and was controlled by bending.Under the El earthquake,the structure was in an elastic state,which can be judged by the initial yielding moment of the member section.Under the E2 earthquake,whether the structure enters the plastic phase was determined by the equivalent yielding moment.If the structure enters the plastic phase,the focus should be on analyzing the displacement capacity of the pier top,the rotation capacity of the plastic hinge area at the pier bottom,and the shear strength.This research can provide a reference for the design and evaluation of the seismic performance of multi-connected small box girder bridges.
关键词
小箱梁/抗震设计/首屈弯矩/等效屈服弯矩/能力保护设计
Key words
small box girder/seismic design/initial yielding moment/equivalent yielding moment/capability protection design
维普
万方数据