摘要
提出了采用钢管混凝土巨型斜交网格结构体系作为超高层建筑筒中筒结构外筒,并提出"强节点"的钢管混凝土空间相贯节点构造,自行研制可加载20000kN的空间加载设备,对8个钢管混凝土空间相贯节点进行试验,得到了节点破坏形态,承载能力及破坏过程;制作了3个同比例、同材料的钢管混凝土短柱试件,进行轴压试验;通过短柱试验结果确定约束混凝土本构关系的参数;采用节点试验结果及约束混凝土本构模型,对节点试件进行了有限元全过程模拟,为钢管混凝土空间相贯节点的应用提供了有效的计算方法。通过切开试验后的节点试件和短柱试件,研究了钢管混凝土应变与其内部混凝土破坏形态的关系,指出钢管内部混凝土的破坏程度受应变影响较大。
A tube-in-tube structural system is presented, in which the obliquely crossing lattice system composed of concrete filled steel tubes （CFST） is used as the outer tube in ultrahigh-rise buildings, and the detailed CFST intersecting connection is proposed, which satisfies the ＂stronger connection＂ criteria. Eight specimens of the connection are tested by a self-equilibrating steel loading equipment with the capacity of 20000kN, to investigate the failure mode, ultimate capacity and collapse procedure. Meanwhile three CFST short column specimens with the same dimension and material are tested in compression to determine the constitutive relation of confined concrete. Based on the test results and the constitutive model of confined concrete, the whole loading response of the specimen is simulated using finite element program, and the effective calculation method for the connection is provided. Observing the inner of the tested specimens, it is found that the failure of the confined concrete depends on its strain.
出处
《工程力学》
EI
CSCD
北大核心
2009年第5期102-109,共8页
Engineering Mechanics
基金
广东省自然科学基金项目(06105416)
华南理工大学亚热带建筑科学国家重点实验室开放研究项目(2008KA01)
关键词
钢管混凝土
斜交网格
节点试验
破坏形态
有限元分析
concrete filled steel tube
obliquely crossing lattice
connection test
failure modes
finite element analysis
