基于动静力试验的连续空心板桥建模方法研究

Study on modeling method of continuous hollow slab bridge based on dynamic and static test

以结构连续空心板桥为研究对象,以空心板的横截面形式和虚拟横梁取值为参变量,建立四种梁格分析模型。在静力试验中四种模型的平均挠度校验系数分别为0.40、0.48、0.44和0.53,动力特性中各一阶频率的最大差值约10%。分析结果表明,在新桥建模分析时,空心板主梁的横截面建议取考虑铰缝填料后的名义横截面,虚拟横梁截面考虑为矩形截面,高度取其铰缝实际高度,宽度取梁格所对应的纵梁的长度。

The structural continuous hollow slab bridge is taken as the object of study.Four kinds of beam grid analysis models are established taking the cross section of hollow plate and the value of virtual beam as parameter variables.In the static test,the average deflection calibration coefficients of the four models are 0.40,0.48,0.44 and 0.53,respectively,and the maximum difference of the first natural frequencies in the dynamic characteristics is about 10%.The analysis results show that the cross section of the hollow plate main beam is proposed to use the nominal cross section which considers the joint filler in the new bridge modeling analysis,the cross section of the virtual beam is taken as a rectangular cross section,and the height is taken as the actual height of the hinge joint,the width is the length of the longitudinal beam corresponding to the beam grid.