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。
The bridge pier with round end is one of the common forms of piers, in order to investigate the influence of different forms and numbers of stiffening ribs in the internal on the anti-collision performance of the round-ended bridge pier using anti-collision box made of sandwich plate, the numerical calculation method is used to comparatively analyse the stress and deformation of the inner and outer steel plates of the sandwich plate anti-collision boxes with different numbers of horizontal and vertical stiffening ribs in the most unfavorable frontal collision by means of static equivalent load. The result shows that （1） to set up the horizontal or vertical stiffening ribs can effectively reduce the stress of sandwich plate at impact point on the anti-collision box, but the decrease degrees of inner steel plate stress and outer steel plate stress is different, the degree of stress reduction in different directions at the same position is different too; （2） the vertical stiffening ribs can effectively reduce the vertical and transverse （horizontal） stresses of the outer steel plate of the sandwich plate at the impact point of the anti-collision box, but can only effectively reduce the vertical stresses on the inner steel plate; （3） horizontal stiffening ribs can only effectively reduce the vertical stresses of the outer plate and the transverse stresses of the inner steel plate of the sandwich plate at the impact point,the other stresses reduction is not obvious ; （4） the degree of stress reduction of the vertical stiffening ribs is greater than that of the horizontal stiffening ribs in the 2 directions of the outer steel plate of the sandwich plate at the impact point, for the inner steel plate, the reduction degree of the transverse stresses at the impact point is greater than that of vertical stresses for the horizontal stiffening ribs ; （5） an excessive number of horizontal or vertical stiffening ribs cannot obviously improve the force and deformation of the anti-collision box, instead,
出处
《公路交通科技》
CAS
CSCD
北大核心
2017年第11期91-99,共9页
Journal of Highway and Transportation Research and Development
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)
关键词
桥梁工程
圆端形桥墩
数值计算法
加劲肋
夹层板防撞套箱
bridge engineering
round-ended bridge pier
numerical calculation method
stiffening rib
anti-collision box made of sandwich
