悬挑施工平台高强螺栓附墙节点抗剪性能研究

Research on Shear Resistance of High-strength Bolt-attached Wall Nodes of Cantilever Construction Platform

为研究悬挑支撑施工平台体系与剪力墙连接的附墙节点抗剪性能,进行4个高强螺栓附墙节点足尺试件的抗剪性能试验,分析附墙节点的损伤过程、破坏形态、极限承载力。对试件进行数值模拟,分析应变、应力特征及损伤破坏过程。结果表明,高强螺栓附墙节点在剪切荷载作用下主要破坏形态为螺栓剪断与剪力墙局部混凝土压碎;混凝土强度等级由C30提高至C50时,试件极限承载力提高11.43%~16.83%;采用抗剪吊筋的试件较无抗剪吊筋试件极限承载力提高15.46%~21.05%;有限元模拟结果与试验结果基本一致。

In order to study the shear resistance of the wall-attached node connected by the cantilevered support construction platform system and the shear wall,four full-scale specimens of the high-strength bolt-attached wall nodes are tested for the shear resistance of the wall-attached nodes to analyze the damage process,damage pattern,ultimate bearing capacity. Numerical simulation is performed on the specimen to analyze the strain,stress characteristics and damage and failure process. The results show that the main failure modes of the high-strength bolt-attached wall nodes under shear load are bolt shear and local concrete crushing of the shear wall. When the concrete strength level is increased from C30 to C50,the ultimate bearing capacity of the specimen is increased by 11. 43% ~ 16. 83%. The ultimate bearing capacity of the specimens with shear suspension bars is increased by 15. 46% ~ 21. 05% compared with the specimens without shear suspension bars,and the finite element simulation results are basically consistent with the test results.