摘要
空间钢-混凝土组合节点核心区的受力特征、破坏模式是建立双向地震作用下节点计算模型的基础,也是准确评估组合结构体系抗震性能的关键问题之一。完成4个方钢管混凝土柱-组合梁空间节点在双向加载条件下的抗震性能试验,重点研究混凝土楼板的组合作用、节点核心区混凝土、节点形式等对空间组合节点抗震性能的影响。各试验模型在加载过程中均产生明显的节点核心区剪切变形,并表现出较好的延性和耗能能力,最终则因核心区混凝土破碎和钢管开裂而丧失承载力。试验表明,混凝土楼板与钢梁的组合作用以及对节点核心区的约束作用、钢管柱内填混凝土均能够明显改善空间节点的受力性能。相对于中柱组合节点,角柱节点的核心区受力较小,整个节点具有更高的承载能力和刚度。
The failure modes of panel zones at composite steel and concrete joints under bi-directional loading are fundamentals in developing and validating nonlinear analysis models and conducting performance simulations. In this study, four specimens for the joint between concrete-filled square steel tubular column and composite steel-concrete beam were tested under bi-directional cyclic loads to investigate the effects of concrete slab, core concrete and joint location on the seismic behaviors of 3D joints. All specimens exhibited large shear deformation in panel zones and ductile behaviors in the loading process, and eventually failed due to the crush of core concrete and fracture of steel tube. Experimental results also showed that concrete slab and core concrete may obviously improve the seismic performance of 3D composite joints. Compared with interior joints, the strength and stiffness of the comer joint were higher.
出处
《土木工程学报》
EI
CSCD
北大核心
2014年第4期47-55,共9页
China Civil Engineering Journal
基金
国家自然科学基金(90815006
51222810)
清华大学自主科研资助计划(2012Z06117)
