【作者】 马宏伟；

【导师】 郝际平； 姜维山；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2003， 博士

【摘要】 随着科学技术的进步和发展，使用功能好、施工快捷、造价低、性能好的钢梁与混凝土柱体系在日本得到了较为广泛的应用。连续复合螺旋箍约束混凝土柱、钢与混凝土组合梁所组成的结构体系比钢梁与混凝土柱体系更具优越性。它降低了结构的自重，节约材料，净使用面积和净高得到了增加，同时具有一般混凝土结构和钢结构的优点。尤其在我国建筑钢材产量逐年递增的时候，组合梁—连续复合螺旋箍混凝土柱结构体系的提出符合建设部建筑产业化及大力发展建筑用钢的要求。端板螺栓连接的组合梁、连续复合螺旋箍混凝土柱节点和连接钢筋传力的组合梁、连续复合螺旋箍混凝土柱节点就是适用于这种体系的节点类型。其中连接钢筋传力的组合梁、连续复合螺旋箍混凝土柱节点更是节点类型中的大胆创新。弄清此类节点的破坏机理、节点核芯区的承载力、在水平低周反复荷载作用下的滞回性能、组合梁配筋率等因素对节点强度等特性的影响对于指导设计、推广组合梁与复合螺旋箍混凝土柱体系、相关的规程制定都有着重要的价值。就此，本文着重做了以下几个方面的工作： 第一次进行了足尺的端板螺栓连接的组合梁、连续复合螺旋箍混凝土柱节点试件和连接钢筋传力的组合梁、连续复合螺旋箍混凝土柱节点试件的拟静力实验，以及相应的模拟节点核芯区试件的拟静力实验，来研究节点的强度、抗震性能等特性，根据实验现象和实验结果，提出了相应的构造措施。 第一次用实体单元对混凝土、钢材以及钢筋组成的端板螺栓足尺节点试件与模拟节点核芯区试件进行三维建模，而且同时考虑了端板与柱表面的接触问题及钢材、混凝土、钢筋等各种材料的非线性，通过合理的单元选取及网格划分，精确地分析了节点区应力的分布，并研究了低周反复荷载作用下节点的抗震性能，对比了实验与有限元分析的结果。作者同时分析了组合梁混凝土强度、组合梁配筋率、组合梁钢材强度对端板螺栓节点抗震性能的影响。 第一次通过构造奇异单元来建立带初始裂纹的节点有限元模型，将断裂问题的研究引入到端板螺栓节点的有限元分析中，并通过ANSYS软件中Parametric Design Language编程来计算裂纹尖端的J积分值、应力强度因子，根据断裂力学中的K准则、J积分准则判断初始裂纹是否会重新启裂。作者同时分析了初始裂纹宽度、组合梁混凝土强度和组合梁配筋率对裂纹尖端处J积分值、裂纹嘴张开位移等断裂参数的影响。 根据实验结果对两种类型的节点提出了基于实验研究的节点核芯区承载力公式；另外对端板螺栓节点，根据有限元分析结果提出了基于有限元分析的节点核芯区承载力公式，并对比了节点核芯区承载力实验值、按本文两种公式一基于实验基础上的经验公式、基于有限元分析基础上的节点核芯区抗剪承载力公式计算值。 本文的实验和理论分析结果，可供设计、相关研究参考，同时对断裂力学在结构工程领域的分析有借鉴意义。更多还原

【Abstract】 With the improvement of science and technology, the composite structure constituted by steel beam and concrete column has been applied more and more in Japan because of low cost and good performance, the structure system constituted by composite beam (SC beam) and continuous compound spiral hoop reinforced concrete column (CCSHRC column) has more superiority than the structure constituted by steel beam and concrete column. In the SC beam and CCSHRC column structure system the structural dead-weight is depressed, the clean use area increases and less materials are used, this system also posses the advantages of the normal concrete structure and steel structure. Especially in the time that the civil structural steel product yield increases by degrees year after year, the bringing forward of this system accords construct ministry’s appealing of construction industrialization and developing the structural steel products using. The endplate bolted SC beam and CCSHRC column joint and the bar passing force’s joint of SC beam and CCSHRC column are the same with SC beam and CCSHRC column structure system, the bar passing force’s joint of SC beam and CCSHRC column is audacious innovation of joint types. The joints’ failure mechanism, the bearing capacity of core zone, hysteretic behavior under horizontal load and influence of the ratio of reinforcement in SC beam on the joint’s behavior are not clear, and making these clear is very important in guiding design, popularizing the SC beam and CCSHRC column structure system and correlative code. At this point, the paper mainly does work as follows:For the first time the quasi-static tests are done to the full size endplate bolted connection of the SC beam and CCSHRC column specimen, the full size bar passing force’s joint of SC beam and CCSHRC column specimens and the corresponding simulating core zone specimens to study the joint’s seismic behavior and strength, the configuration advise is brought forward according to the test phenomenon and the test results.For the first time the three dimension finite element model of the full size endplate bolted connection specimen and simulating core zone specimen are set up by the solid element, the contact problem of the endplate and column surface and the material nonlinear of concrete, steel and bar are taken into account in modeling at the same time, the stress distributing in joint zone is accurately analyzed by the rational element meshing, also the seismic behavior of the joint under cyclic load is studied, the test results and finite element results are contrasted. Finally theauthor analyzes the concrete strength, the ratio of reinforcement in the SC beam and steel strength’s influences on the joints seismic behavior.For the first time the endplate bolted connection’s finite element model with the original crack is set up by the singular element, the fracture problem study is introduced to the finite element analyzing. The J integral value and stress intensity factor of the crack tip are calculated by the ANSYS Parametric Design Language program, and the developing of original crack is judged from the K Rule and J Integral Rule. Finally author analyzes the width of the original crack, concrete strength and the ratio of reinforcement in SC beam’s influences on the fracture parameters such as the J integral value and crack mouth open displacement.The core zone bearing capacity formulas of two types of joints based on the tests are brought forward respectively according to the tests. For the endplate bolted connection of SC beam and CCSHRC column, the core zone bearing capacity formula based on the finite element analyzing is also brought forward, at the same time the test values of core zone’s bearing capacity, the formula calculating values based on test and based on finite element analyzing are compared.The results of test and finite element analysis can guide the design of endplate bolted connection of SC beam and CCSHRC column, simultaneously the paper is use for reference in structural fracture analysis.更多还原