桥梁动力测试及舒适性评价研究

摘要:

本文通过对某先简支后连续钢混组合梁动力测试,发现桥梁制动试验时人明显感觉梁体水平晃动厉害,文中通过测试对该现象产生原因进行了分析,并对桥梁舒适性评价进行了研究,研究结果表明该桥顺桥向振动处于人体容易感受到频域范围,目前桥梁顺桥向振幅值最大值不超过3mm,且桥梁顺桥向阻尼比较大,刹车后桥梁纵向能够立即消能,伸缩缝工作均正常,表明该振动对桥梁安全运营影响不大,目前规范关于梁桥振动研究和评价指标较少,本文所采用的评价方法可为同类桥梁作参考。

Abstract:

Through the dynamic test of a simply supported and then continuous steel-concrete composite beam, it is found that when the bridge brake test is carried out, it is obvious that the beam sways horizontally. The causes of this phenomenon are analyzed through the test and the comfort evaluation of the bridge is studied. The research results show that the vibration along the bridge is in the frequency domain that can be easily felt by the human body. At present, the maximum along-bridge amplitude of the bridge does not exceed 3mm, and the bridge along-bridge damping is relatively large, the longitudinal energy dissipation of the bridge can be immediately after braking, and the expansion joint works normally, which indicates that the vibration has little influence on the safe operation of the bridge. At present, there are few research and evaluation indexes on beam-bridge vibration in the code. The evaluation method adopted in this paper can be used as a reference for similar bridges.