基床系数对“井”字梁闸底板结构影响的研究  

The Influence of Subgrade Reaction Coefficient on Well-shaped Beam Sluice Bottom Board

作　　者：俞伟 卢廷浩[2] 

机构地区：[1]淮安市水利勘测设计研究院有限公司南京分公司,江苏南京211102 [2]河海大学岩土工程研究所,江苏南京210098

出　　处：《人民珠江》2018年第1期77-80,共4页Pearl River

摘　　要："井"字梁闸底板在水利工程水闸底板设计及应用中较为少见,针对新疆某"井"字梁拦河闸,研究了基床系数对闸底板沉降、内力分布规律的影响及其确定的方法。结果表明:在正常挡水情况下,当基床系数较小时,"井"字梁竖向沉降较为明显,弯矩值较大,随着基床系数取值的增加,竖向沉降和内力值有所减小,最终趋于稳定数值;联合有限元法和弹性地基梁法求解"井"字梁内力,可以合理的确定基床系数的取值;"井"字梁闸底板的弯矩和剪力极值均发生在纵梁和横梁相交处的截面上,截面底部处于受弯和顶部处于受压状态,闸室上部结构向下传递的荷载基本由"井"字梁承担。研究结果可为类似结构形式的水闸设计及应用提供借鉴。The well-shaped beam sluice bottom board is relatively rare in the design and application of water conservancy projects. Aiming at a well-shaped beam sluice in Xinjiang province, this paper studied influences and confirmative methods of subgrade reaction coefficient on gate floor sedimentation and internal force distribution. Results indicated that, in normal water retaining condition, when subgrade reaction coefficient was small, the vertical sedimentation of well-shaped beam was relatively obvious and bending moment value was large. With the increase of subgrade reaction coefficient, vertical sedimentation and internal force value were slightly reduced and finally tended to be stable. The finite element method and elastic foundation beam method were used to solve internal force of"well" girder, which could confirm the value of subgrade reaction coefficient rationally. Well-shaped beam sluice' s bending moment and shearing force were located on the intersection of stringer and beam. The bottom section kept in bending state and top part kept in compressed state. Load from superstructure of lock chamber was basically borne by the well-shaped beam. Research results could provide references for water gate design and application of similar structure form.

关 键 词：“井”字梁闸底板 基床系数 弹性地基梁法 有限元法 沉降 内力 

分 类 号：TV698.2[水利工程—水利水电工程] TV91