沉箱外壁和隔墙内力计算优化  

Internal force calculation optimization of caisson outer wall and partition wall

作　　者：刘海欣[1] 王勇健[1] 张丽珍[1] LIU Haixin;WANG Yongjian;ZHANG Lizhen(CCCC-FHDI Engineering Co.,Ltd.,Guangzhou 510230,China)

机构地区：[1]中交第四航务工程勘察设计院有限公司,广东广州510230

出　　处：《水运工程》2024年第5期55-60,共6页Port & Waterway Engineering

摘　　要：现行规范对于沉箱构件内力计算进行简化,忽略上部结构对构件的约束。将考虑沉箱上部结构对构件施加有效约束时的横向跨中弯矩和支座弯矩结果与规范计算模式结果进行对比分析,并比较不同计算模式下的构件顶部1.5l内(l为仓格间距)和构件底部1.5l内的内力。结果表明,当考虑沉箱上部结构对构件施加有效约束时,沉箱构件上部的横向跨中弯矩可减少约36%,支座弯矩可减少约14%,可显著优化结构设计,同时须核算构件竖向强度。虽然结构约束条件与底部相似,但由于荷载分布不同,构件顶部不适合采用三边固接一边简支模型计算内力;沉箱构件内力分布不均匀,边缘仓格的内力远大于中间仓格的内力,弯矩增加超过30%,对于仓格少于或等于2个的小型沉箱设计时尤其值得注意,此时建议建立整体模型进行分析计算。The current code simplifies the internal force calculation of caisson members,ignoring the constraints of the superstructure on the members.We carry out the comparative analysis of transverse mid-span bending moment and support bending moment results by considering the effective constraints of the superstructure on the members with results of code calculation pattern,and compare the internal forces within 1.5 l at the top of the member and 1.5 l at the bottom of the member under different calculation patterns.The results show that when the upper structure of the caisson imposes effective constraints on the members,the transverse mid-span bending moment of the upper part of the caisson member can be reduced by about 36%,and the support bending moment can be reduced by about 14%,which can significantly optimize the structural design.At the same time,it is necessary to calculate the vertical strength of the members.Although the structural constraint conditions are similar to those at the bottom,due to the different load distribution,the top of the member is not suitable for calculating the internal force by using the three-side consolidation and one-side simply supported model.The internal force distribution of caisson members is uneven.The internal force of the edge compartment is much larger than that of the middle compartment,and the bending moment increases by more than 30%.It is particularly noteworthy for the design of small caissons with less than or equal to 2 compartments.In this condition,it is recommended to establish an overall model for calculation.

关 键 词：沉箱 构件内力 约束 计算 

分 类 号：U656[交通运输工程—港口、海岸及近海工程]