【作者】 黄福云； 周志明； 丁玉仁； 宋永青； 林叶茂；

【Author】 HUANG Fuyun;ZHOU Zhiming;DING Yuren;SONG Yongqing;LIN Yemao;College of Civil Engineering,Fuzhou University;Pingtan Comprehensive Experimental Zone Transportation Investment Group Co.,Ltd;

【机构】 福州大学土木工程学院； 平潭综合实验区交通投资集团有限公司；

【摘要】 以某整体桥为工程背景,进行了采用H形ECC桩基的整体桥试设计,基于MIDAS/Civil软件建立了原桥与试设计桥的三维梁格模型,并对比分析了两者在恒载、活载、温度荷载以及地震荷载作用下的受力性能。分析结果表明,采用H形ECC桩基的试设计桥的承载能力、抗裂与变形能力均能满足规范要求。在恒载作用时,试设计桥主梁在桥台处负弯矩比原桥有显著降低,降幅为39.5%,跨中正弯矩增幅仅为4.2%,幅度较小;在活载作用(即汽车偏载)时,试设计桥主梁在桥台处负弯矩比原桥也有减少,降幅为15.9%。在温度荷载作用下,主梁、桥台与桩基的弯矩以及剪力均有显著减小,其中降温时桥台与桩基顶部的弯矩分别减少33.8%、38.4%。此外,在地震荷载作用下,试设计桥的位移响应(纵桥向)比原桥大,但是内力响应明显减少,以桩基最为明显,其弯矩降幅达到51.1%。更多还原

【Abstract】 Taking a practical integral abutment jointless bridge as the engineering background,a trial design of the integral abutment jointless bridge using H-shaped ECC pile foundation was proposed in this paper.The three-dimensional grid models of the original bridge and the trial design bridge were established using MIDAS/Civil software.The mechanical properties of the two bridges under dead load,live load,temperature load and seismic load were compared and analyzed.The results show that the load-bearing capacity,crack resistance and deflection of the trial-designed bridge can meet the requirements of the specification.The negative bending moment of the main girder of the trial-designed bridge at the abutment under dead load is significantly lower than that of the original bridge by 39.5%,and the positive bending moment in the middle of the span increases by 4.2%,which is relatively small.The negative bending moment of the main girder of the trial designed bridge at the abutment under the live load(i.e.,the unbalanced load of the vehicle) is also reduced compared to the original bridge,with a decrease of 15.9%.Under temperature load,the bending moments and shear forces of the main girder,abutment and pile foundation are significantly reduced,and the bending moments of the abutment and the top of the pile foundation are reduced by 33.8% and 38.4% respectively when the temperature drops.In addition,under the seismic load,the displacement response(longitudinal direction) of the trial-designed bridge is larger than that of the original bridge.However,the internal force response is significantly reduced especially for the pile foundation,whose bending moment is decreased by 51.1%.更多还原