夹层板整体曲面形桥墩防撞装置受力性能分析

Analysis of Mechanical Properties of Pier Anti-collision Device by Sandwich Plate with Overall Curved Surface

为了解一种新型夹层板整体曲面形桥墩防撞装置的防撞性能,采用数值计算法对不同夹层板厚度的曲面形防撞套箱,以不同角度、不同位置撞击时的受力性能进行了对比分析。研究结果表明:夹层板外层钢板表面各向应力绝对值均为内层钢板的2倍以上;外层钢板表面的各向压应力相差不大,并向四周迅速减小;内层钢板表面应力在撞击点附近有拉压变化,竖向应力的绝对值比横向应力的大;夹层板曲面防撞套箱正撞的几率小,斜撞时能明显降低套箱的受力,撞击点的竖向偏离应力降幅远大于水平向偏离应力的降幅;夹层板厚度变化对钢板应力的影响大于对凹陷深度的影响。

In order to study the erashworthiness of a new type of bridge pier anti-collision device by sandwich plate with overall curved surface, the mechanical properties of anti-collision box by sandwich plates of different thicknesses with overall curved surface were compared for analysis from different impact angles and in different impact positions with numerical method. The results show that the absolute values of stress in two directions on the surface of the outer steel plate of sandwich plate are 2 times as those on the surface of the inner steel plate; the compressive stress values in different directions on the surface of outer steel plate have little difference, and decrease quickly around; the stress on the surface of the inner steel plate has the change of tension- compression near the point of impact, and the absolute value of the vertical stress is greater than that of the transverse stress; the pier anti-collision box by sandwich plate with overall curved surface has little chance of head-on impact, oblique impact can obviously reduce the stress of the box, the reduced degree of stress at the impact point with vertical deviation is much greater than that with horizontal deviation; and the change of sandwich plate thickness has greater influence on the stress of the steel plate than on the indentation depth.