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为了研究车辆随机荷载作用下的大跨径钢桥面铺装层动响应,首先根据目前钢桥面铺装的平整度现状,利用功率谱密度函数模拟桥面不平度;然后选取单轮车辆模型计算由桥面不平度引起的行驶车辆随机动荷载;最后采用瞬态动力分析方法计算了铺装层的竖向位移及最大横向拉应力等主要力学响应,并与以往的移动恒载作用下铺装层的动响应及静力计算结果做了比较.分析表明,针对铺装层而言,相邻的2块横隔板的跨中位置为最不利荷载位置;考虑桥面不平度情况下铺装层的最大竖向位移和最大横向拉应力的峰值分别是只考虑冲击系数的移动恒载作用下的1.33倍和1.39倍.研究结果为铺装层的混合料和结构设计提供了理论依据,对桥面施工及维护提出了严格要求.
In order to study the dynamic response of pavement of long-span steel deck under random loading of vehicles, firstly, according to the current flatness status of steel deck pavement, the power spectral density function is used to simulate the roughness of deck; then, Calculating the random dynamic load of the driving vehicle caused by the unevenness of the bridge deck; finally, the main mechanical response of vertical displacement and the maximum transverse tensile stress of the pavement is calculated by transient dynamic analysis method, and compared with the previous mechanical constant load The dynamic response of the loading layer and the static calculation results are compared. The analysis shows that for the pavement layer, the midspan position of the two adjacent diaphragms is the most unfavorable loading position. Considering the unevenness of the deck surface, The maximum vertical displacement and the maximum transverse tensile stress peak respectively are 1.33 times and 1.39 times respectively under the action of constant load only considering the impact coefficient.The research results provide theoretical basis for the design of mixture and structure of pavement, The bridge deck construction and maintenance made stringent requirements.