钢箱梁桥桥面铺装层动态响应分析

Dynamic response of deck overlays of steel box under live load

主要针对动态荷载作用 ,对桥面铺装层结构参数敏感性作了分析 ,揭示了结构参数对桥面铺装层应变的不同于静态荷载作用时的影响方式 .计算以典型结构为基础 ,变化各种参数 ,考察得到的频率或铺装层最大横向正应变 ,定性或定量地分析了参数变化对铺装层的间接或直接影响 .间接影响是基于结构频率的变化情况 ,低阶频率在参数变化前后发生明显变化的 ,表明该参数对铺装层应变影响较大 ,反之则可能较小 .直接影响是通过铺装层最大横向正应变的变化而得到 .分析显示 ,动荷载作用下 ,箱梁宽度、下部结构、顶板厚度、U肋厚度、荷载通过的横向位置等均对应变产生了较大影响 ,而箱梁高度对应变的影响不大 .

This paper analyzes the impact of structure parameters of steel box under dynamic load, which is different from the circumstances under static load. Typical structure is adopted. Through altering its dimensions, frequencies or strains can be calculated and the essentiality of these parameters can be measured. If the low frequencies change remarkably after some parameter being altered, it implies that this parameter can obviously affect the strain of deck pavement, otherwise, this parameter makes little influence. The maximal transverse strain of pavement is another value for estimating the efficiency of these parameters. The results show that width of box, nether structure, thickness of deck and U-rib, and transverse position of load all strongly influence the strain of pavement, however, the height of box makes little effect.