大型地下连续墙钢筋笼动态吊装过程分析

Analysis on Dynamic Hoisting Process of Reinforced Cage for Large Diaphragm Wall

基于三维有限元数值模拟方法,对超大型地下连续墙钢筋笼施工吊装过程进行了动态数值模拟。以钢筋笼从水平到竖直的起吊过程中0°、30°、45°、60°四种工况建立了能够模拟动态吊装过程的有限元模型。根据数值模拟结果分析了动力效应影响下的笼体受力规律,确定出了吊装过程的最不利工况。研究结果表明: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。

Dynamic numerical simulation based on 3 D FEM is conducted on the hoisting process of the reinforced cage of ultra-large-scale diaphragm wall. The finite element model is established to simulate four conditions of 0°, 30°, 45° and 60° from horizontally to vertically of dynamic hoisting process of reinforced cage. This paper analyzes the stress law of reinforced cage under the dynamic effect and makes sure the most unfavorable condition of hoisting process according to the numerical simulation result. The study results show that the dynamic effect is obvious in the hoisting process of reinforced cage, the maximum stress of the longitudinal truss rebar and transverse truss rebar will appear under 30° condition. The stress distribution is as the whole that the stress is larger near the part of hoisting point, and the dynamic effect is very obvious. When the welding damage occurs in this part, it is extremely likely to cause the construction accidents, which should be paid attention to.