组合加固混凝土悬挑梁力学性能研究

Research on mechanical properties of compositely reinforced concrete cantilever beam by composite reinforcement method

基于某工程悬挑结构的加长方案,提出了增大截面、屋面吊挂、增设拉杆以及增设型钢支撑这几种加固方案,对比分析各加固方案后,最终选择增设型钢支撑这一组合加固方案。为研究加固节点的受力性能,采用ABAQUS软件对节点进行模拟加载,分析节点在设计荷载(1.3恒载+1.5活载)及1.2倍设计荷载作用下的材料应力及塑性应变开展过程。结果表明,在设计荷载作用下,节点的悬挑梁支座处出现了一定的塑性应变,但并未随荷载加大而继续扩展,说明加固后的节点具有足够的承载力,能够满足改造后的建筑功能要求,组合加固法在该工程中是安全可行的。最后,对组合加固法在施工过程中的重点、难点进行总结,为后续改造工程提供参考。

Based on the extension scheme of the cantilever structure in a project,several reinforcement schemes were proposed,such as increasing cross-section,roof hanging,adding steel tie rods and adding structural steel supports.After comparing and analyzing each reinforcement scheme,the combined reinforcement scheme of adding structural steel supports was finally chosen.In order to study the mechanical performance of the reinforced joints,ABAQUS software was used to simulate the loading of the joints and analyze the material stress and plastic strain development process of the joints under the design load(1.3 dead load+1.5 live load)and 1.2 times the design load.The results show that under the design load,a certain plastic strain appears at the cantilever beam support of the joint,but it does not continue to expand with the increase of the load,which indicates that the reinforced joint has enough bearing capacity to meet the functional requirements of the reconstruction building,and the combined reinforcement method is safe and feasible in this project.Finally,the key points and difficulties of the combined reinforcement method in the construction process were summarized to provide reference for subsequent reconstruction projects.