地铁高架车站型钢混凝土转换短梁试验研究

摘要

The transfer joist of the integrated structure of bridge and building in elevated rail transit station has different loading characteristics to those in building structures and the design theory still needs improvement.On the background of the project of Chongqing elevated rail transit station,short transfer joists of both Steel Reinforced Concrete(SRC)and Steel Reinforced High Ductile Concrete(SRHDC)are studied with experiment method to provide suggestions for rational design.The failure mode,shear strength and deformation ability of the two options are analyzed with experimental data from static tests of scale specimens.The design methods for SRC and SRHDC short transfer beams with two side cantilevers on single span are summarized.Results show that SRC short transfer joist designed with current codes can meet the requirements of loading capacity and ductility.Compared with SRC short transfer joist under identical conditions,SRHDC short transfer joist though has a slight improvement of shearing capacity,but its shearing dissipation capacity increases significantly and the damage degree is effectively reduced.%高架车站"桥-建组合式"中的转换梁与建筑结构中的转换梁受力特点有所不同,设计理论尚待完善.结合重庆某高架车站工程项目,对型钢混凝土和型钢高延性混凝土转换短梁进行试验研究,为其合理设计提供建议.采用缩尺静力试验对比二者在破坏形态、抗剪承载力、变形能力等方面的不同,并总结单跨两侧带悬臂型钢(高延性)转换短梁的承载力设计方法.结果表明:采用现行规范设计的型钢混凝土转换短梁可以满足承载力和延性要求;其他条件相同时,型钢高延性混凝土转换短梁比型钢混凝土转换短梁的抗剪承载力略高,但可显著提高抗剪耗能能力、有效降低破坏时的损伤程度.