吊装过程中纵向桁架筋受力数值模拟分析

NUMERICAL SIMULATION ANALYSIS OF LONGITUDINAL TRUSS REINFORCEMENT STRESS IN HOISTING PROCESS

在地下连续墙钢筋笼制作时,为合理构建钢筋笼骨架,布置吊点。通过建立模型进行有限元数值模拟,研究了吊装过程中钢筋笼0°、22.5°、45°、67.5°和90°这5种情况,简单掌握纵向桁架筋吊装过程中的轴力弯矩变化,数值计算出纵向桁架筋因钢筋笼倾角变化下内力的变化。结果表明起吊过程中纵向桁架筋内力不会出现突变性的变化,能准确找出关键节点并加以控制。可见通过数值模拟计算出的数据,从整体上把握桁架筋的内力变化情况,进一步指导现场施工。

Lifting points shall be arranged in order to reasonably construct the reinforcement cage skeleton during the fabrication of reinforcement cage of diaphragm wall.The five situations of reinforcement cage 0°,22.5°,45°,67.5°and 90°in the hoisting process are studied,and the changes of axial force and bending moment in the hoisting process of longitudinal truss reinforcement are simply mastered by establishing a model for finite element numerical simulation.The change of internal force of longitudinal truss reinforcement under the change of reinforcement cage inclination is calculated numerically.The results show that the internal force of longitudinal truss reinforcement will not change abruptly in the lifting process,and the key nodes can be accurately found and controlled.It can be seen that the data calculated by numerical simulation can grasp the internal force change of truss reinforcement as a whole and further guide the on-site construction.