预加轴力下加强冷弯T型方钢管节点抗冲击试验研究

Experimental study on axially pre-loaded stiffened cold formed square tubular T-joints under impact loading

为深入研究加强方式对T型方钢管节点的抗冲击性能的影响,文章进行了预加轴力下加强冷弯T型方钢管节点抗冲击性能试验研究,研究了主管内部加劲肋和主管上翼缘垫板加强对节点试件冲击力、支管顶部及主管底部变形发展等受力性能指标的影响.通过试验得到管节点在冲击荷载作用下的破坏模态、冲击力和位移时程曲线以及荷载-位移关系曲线,获得加强后节点在冲击荷载作用下的抗冲击工作机理,为管结构抗冲击设计和加固维护提供参考.

In order to study the effect of stiffened methods on impact resistance of square tubular T-joints deeply, impact tests on axially pre-loaded stiffened cold-formed square tubular T-joints(inner-stiffenedchordand upper flange plate reinforcement) were conducted to highlight the effect on the impact force, deformation development for the top of brace and bottom of chord. The failure modes, load-displacement curves, time history of impact force and displacement curves were obtained to reveal the impact resistance mechanism of stiffened tubular T-joints under impact loading, which canprovide some suggestions to choose relevant reinforced methods for designing and strengthening the building.