集中荷载作用下板的弯矩计算  

Calculation of slab bending moment under action of concentrated load

作　　者：陈际丰[1] 章少兰 仲维亮[1] CHEN Ji-feng;ZHANG Shao-lan;ZHONG Wei-liang(CCCC Water Transportation Consultants Co.,Ltd.,Beijing 100007,China)

机构地区：[1]中交水运规划设计院有限公司,北京100007

出　　处：《水运工程》2021年第10期184-187,193,共5页Port & Waterway Engineering

摘　　要：针对现行的JTS 167—2018《码头结构设计规范》中偏置荷载弯矩计算宽度公式b′_(c)=0.5b_( c)+y的限制条件“当b_(c)>B时,取b_(c)=B”将导致在板宽B<0.5 l 0时,内力计算结果偏大的问题,进行现行规范JTS 167—2018与旧规范JTJ 291—1998相关条文的对比分析。将有限元软件与规范公式计算的面板在集中荷载作用下弯矩及内力结果进行比较。结果表明,偏置荷载下的弯矩计算宽度b′_(c)=0.5b_( c)+y的限制条件“当b′_(c)>B时,取b′_(c)=B,当b′_(c)<B时,取b′_(c)=0.5b_(c)+y”较符合面板受力的实际情况。In view of the problem that the restrictive condition“when b_(c)>B,then b_(c)=B”in the current JTS 167—2018 Design Code for Wharf Structures for the formula b′_(c)=0.5 b_(c)+y for calculating width of bending moment under offset load will lead to the larger calculation result of internal force when the plate width B is less than 0.5 l 0,we make a comparative analysis of the relevant provisions in the current code JTS 167—2018 and the old code JTJ 291—1998,and compare the bending moment and internal force results of slab under concentrated load calculated by the finite element software and the code formula.The results show that the restrictive conditions“when b′_(c)>B,then b′_(c)=B;when b′_(c)<B,then b′_(c)=0.5 b_(c)+y”for the formula b′_(c)=0.5 b_(c)+y for calculating width of bending moment under offset load is more in line with the actual situation.

关 键 词：钢筋混凝土板 集中荷载 弯矩计算 

分 类 号：TU375.2[建筑科学—结构工程] U656.1[交通运输工程—港口、海岸及近海工程]