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为评价中国省道 S101 线昭阳至永善公路改建工程 K111+409.5 桥的受力状况与工作性能该桥是一种新型结构形式桥其上部结构为直腹板带翼箱梁具有一定的科研试验性。通过静动载试验研究其真实受力状况静载试验是在相应的测试截面按照试验荷载效率合理布载并测试主梁各截面相应测点应力和位移动载试验是通过模态试验和跑车试验来测试该桥的固有频率、阻尼比和冲击系数。结果表明该桥主拉应变校验系数、挠度和应变校验系数均未超出标准容许值 1桥梁实际工作性能很好相对残余应变和残余挠度最大值分别为 9.36% 和 2.21%都未超出标准容许值 20%桥梁整体处于弹性变形阶段在动力荷载作用下桥梁第 1 阶竖向自振频率为 4.883阻尼比为 0.005%应变测试所得冲击系数在 1.07~1.26 之间竖向实测的频率大于理论计算频率桥梁整体结构刚度满足设计要求。

直腹板带翼箱梁桥荷载试验研究与承载力评定