摘要
基于三维有限元数值模拟法,对超大型地下连续墙钢筋笼施工吊装过程进行动态数值模拟。以钢筋笼从水平到竖直的起吊过程中0°,30°,60°3种工况建立能够模拟动态吊装过程的有限元模型,并进行现场试验。结合数值模拟和现场试验结果分析了动力效应影响下的笼体受力规律,确定了吊装过程的最不利工况,并在此分析方法基础上对钢筋笼吊装施工进行损伤分析和方案优化分析。研究结果表明:有限元数值模拟结果和现场试验结果基本吻合,验证了理论分析的正确性;钢筋笼吊装过程中动力效应明显,30°时纵向、横向桁架钢筋出现最大应力,应力分布整体表现为吊点位置附近应力较大,且动力效应非常明显,当该部位出现焊接损伤时,极易造成施工事故,应予以重视;通过对吊装方案进行优化,可显著提高吊装施工的安全性和经济性。
Dynamic numerical simulation based on 3D FEM was conducted on the lifting process of the reinforcement cage of ultra large scale diaphragm wall. The degrees of 0°,30°,60° from horizontal to vertical were chosen as the basic working conditions of the FEM to simulate the dynamic lifting process.With the influence of dynamic effect,the stress distribution of the reinforce cage was studied,through both numerical simulation and field test methods. The most unfavorable condition of lifting process was found,damage analysis and optimization analysis were also conducted with this numerical method. The results show that the results of the finite element simulation are in accord with the field test,which confirms the correctness of the theoretical analysis. The dynamic effect is obvious during the lifting process,the maximum stress of the longitudinal and transverse truss bars appeares under 30° condition,and the stress near the lifting points is large while the one far away from the lifting points is relatively smaller. Welding damage near the lifting points can easily lead to construction accident,which should be attached great importance. Optimization analysis for lifting schemes can significantly improve the safety and economy of the construction.
出处
《施工技术》
CAS
北大核心
2016年第20期91-95,共5页
Construction Technology
基金
国家自然科学基金资助项目(51178362)
武汉市城建委科技计划项目(201411)
关键词
地下连续墙
吊装
动力系数
应力
数值模拟
diaphragm wall
hoists
dynamic coefficient
stress
simulation
