带加劲肋的圆端形夹层板桥墩防撞套箱受力分析

发布时间：2018-08-01 15:18

【摘要】：带圆端头的桥墩是常见的桥墩形式之一,为探讨该种圆端形桥墩在采用夹层板防撞套箱时内部设置不同形式和数量加劲肋对防撞性能的影响,采用数值计算法,通过静力等效的荷载作用方式,对分别设置不同数量的水平加劲肋和竖向加劲肋的夹层板防撞箱内、外层钢板在最不利正撞时的应力和变形进行了对比分析。结果表明:设置水平加劲肋和竖向加劲肋均能有效减小防撞箱撞击点处夹层板的应力,但对内、外层钢板的应力减小程度不相同,对同一位置不同方向的应力减小程度也不相同;设置竖向加劲肋能有效减小防撞套箱撞击点处夹层板外层钢板的竖向和横向(水平向)应力,但对内层钢板只有效减小竖向应力;水平加劲肋只有效减小防撞套箱撞击点处夹层板外层钢板的竖向应力和内层钢板的横向应力,其他应力不明显;竖向加劲肋对撞击点处夹层板外层钢板的两个方向应力减少程度大于水平加劲肋的减少程度,而对内层钢板而言,水平加劲肋对撞击点处横向应力的减少程度大于竖向应力的减少程度;设置过多数量的水平加劲肋或竖向加劲肋对改善防撞箱受力和变形不明显,反而增加自重及成本,但由于现实中碰撞点是随机的,必须设置一定密度的加劲肋,特别是竖向加劲肋,而水平加劲肋不宜多设。
[Abstract]:The pier with round end head is one of the common pier forms. In order to discuss the influence of different forms and number of stiffening ribs on the anti-collision performance of this kind of round end pier, the numerical calculation method is adopted in order to discuss the influence of different forms and number of stiffening ribs on the anti-collision performance of this kind of circular end-shaped pier when adopting sandwich plate anti-collision sleeve box. Through the static equivalent load mode, the stress and deformation of the outer steel plate in the sandwich plate anti-collision box with different number of horizontal stiffeners and vertical stiffeners are compared and analyzed under the most unfavorable positive impact. The results show that both horizontal stiffener and vertical stiffener can effectively reduce the stress of the sandwich plate at the impact point of the collision box, but the stress reduction degree of the outer steel plate is different. The degree of stress reduction in different directions of the same position is also different, and the vertical stiffening rib can effectively reduce the vertical and horizontal (horizontal) stresses of the steel plate outside the sandwich plate at the impact point of the collision box. The horizontal stiffening rib can only effectively reduce the vertical stress of the outer steel plate and the transverse stress of the inner steel plate at the impact point of the crash-proof sleeve box, but the other stresses are not obvious. The degree of stress reduction in both directions of the vertical stiffener on the outer layer of the sandwich plate at the impact point is greater than that of the horizontal stiffener, but for the inner steel plate, The horizontal stiffener reduces the transverse stress at the impact point more than the vertical stress, and setting too many horizontal stiffeners or vertical stiffeners is not obvious to improve the force and deformation of the impact box, but increases the weight and cost. However, due to the random impact point in reality, stiffening ribs of certain density, especially vertical stiffeners, should be set up, but horizontal stiffeners should not be set up.
【作者单位】：华南理工大学土木与交通学院;
【基金】：国家自然科学基金项目(51278201) 广东省交通运输厅科技项目(粤交科2012-02-021) 广东省公路管理局科技计划项目(粤公研2011-28)
【分类号】：U441.5

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