【摘要】 为更合理评价亚健康桥梁剩余承载力,该文提出通过截面折减反馈计算法对亚健康简支T梁桥的应变进行控制,从而确定桥梁临界使用承载力和限载指标行之有效的评估方法。通过旧桥荷载试验实测数据与有限元模型计算结果的比值,推算其刚度折减系数,再算出亚健康桥梁折减抗弯惯性矩以及质心位置,修正有限元计算模型,进行反馈计算。通过控制应变,以折减设计荷载的方式求出桥梁内力,进而确定旧桥的限载指标。通过旧桥检测实例,验证该限载措施的有效性和该评估方法的可行性。更多还原

【Abstract】 In order to evaluate the remaining load capacity of sub-health bridges reasonably, this paper proposed a method for evaluating the remaining load capacity and the limited load index of the sub-health simply supported T beam bridge according to the measured loading test data. Through comparing the measured results with FE model, the stiffness reduction coefficient was calculated. Then the deducted bending inertia moment and the centroid relocation of the sub-health bridge were figured out. These parameters were then inputted to the FE model for conducting a feedback calculation. Lastly, the limited load index was predicted by calculating the critical internal force in terms of decreasing the design load according to the controlled-stain. A sub-health bridge case was presented to verify this method.更多还原