单索面斜拉桥主梁变宽段模型试验方法  

Test method on mutative width girder segment of single plane cable-stayed bridge

作　　者：叶梅新[1] 李恩良[1] 侯文崎[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《中南大学学报（自然科学版）》2011年第1期199-206,共8页Journal of Central South University:Science and Technology

基　　金：河南省交通科技规划项目(2006326)

摘　　要：在研究单索面混凝土斜拉桥边跨具有变宽段受力情况的模型试验中,将斜拉索力分解为水平和竖向2个分力,水平分力通过张拉布置在箱梁内的体外预应力钢束来模拟,竖向分力通过设置在主梁底部相应位置的弹性支撑梁提供的竖向反力来模拟;通过桥面分布荷载、边界条件荷载和斜拉索荷载的同步协调加载来保证各工况荷载在结构变宽段内引起的轴力和弯矩均与实桥的相似,从而保证模型截面应力与实桥的等效。分析计算和试验结果表明:在各工况荷载作用下,模型变宽段内的顺桥向弯矩与实桥相应荷载下的弯矩基本相似,各工况加载模式正确反映了实桥的受力状态;试验值的分布规律与理论值的分布规律吻合较好,各工况荷载作用下模型截面应力与实桥截面应力等效;研究成果也为同类桥梁的研究提供了一定的理论和试验基础。In the simulation method for concrete single plane cable-stayed bridge model test, the cable force was divided into horizontal force and vertical force, and then the horizontal force was loaded by tensioning prestressed tendon and the vertical one was loaded by the elastic simple supported beams supporting the girder at the bottom deck of the model. Through the deck load, boundary condition load and cable load＇s synchronously loading to ensure the model＇s moment along the bridge＇s length was similar to that of the real bridge, so as to ensure the cross section stress of model was equivalent to that of the real bridge. Calculation and test results show that the model＇s moment on the mutative girder is similar to that of the real bridge under each load condition. The load model reflects the real bridge＇s stress state accurately. The distribution of the test values can meet the theoretical value very well, so is the cross section stress. The test also provides an important reference for study on the similar bridges.

关 键 词：单索面斜拉桥 主梁变宽段 缩尺模型 等效模拟 

分 类 号：U443.27[建筑科学—桥梁与隧道工程]