钢—混组合梁桥动力性能及滑移效应试验研究

Experimental Study on Dynamic Performance and Slip Effect of Steel-Concrete Composite Beam Bridge

对钢—混组合梁桥的动力性能和滑移效应进行综合试验研究和理论分析,并对桥梁的动力性能、滑移效应以及行车的舒适性进行了评价。现场实测钢—混组合梁桥在汽车活载作用下结合面处相对滑移情况,以及桥梁的脉动效应和跑车的自振特性、动挠度、阻尼比等动力响应值,再将现场实测值、规范计算值和有限元计算值进行比较分析。试验结果表明,在最大设计活载作用下,结合面处纵向滑移量平均值小于0.02mm,滑移效应对结构受力性能影响很小,可以忽略不计;钢—混组合梁桥的振动频率较低、柔性较大,阻尼比相对较小;汽车活载作用下,钢—混组合梁桥的结构动力响应和动力特性均良好,能够满足道路行车舒适性的要求。

Comprehensive experimental study and theoretical analysis for the dynamic performance and slip effect of the steel-concrete composite beam bridge are carried out. Slip situation at the combined surface and pulsating effect of the steel-concrete composite beam bridge under live load of vehicles, and the dynamic response values of the bridge＇s natural vibration, dynamic deflection and damping ratio are taken on site and compared with the calculated values by the design codes and finite element calculation value The test results show that under the maximum design live load, the average slip value at the joint surface is less than 0.02mm, and the slip effect has little impact on the mechanical performance of the structure, so it can be neglected. The steel-concrete composite beam bridge has low vibration frequency, large flexibility and relatively small damping ratio. Under dynamic load, the structural dynamic response and dynamic characteristics of the bridge structure are good, satisfying the driving comfort requirements.