多层钢框架梁柱T型节点连接性能的试验研究

【作者】 梁亚雄；

【导师】 王秀丽；

【作者基本信息】 兰州理工大学 ， 结构工程， 2003， 硕士

【摘要】 钢结构建筑以其特有的优越性，加之我国钢产量的飞速上升，近年来发展势头迅猛，尤其是在多高层建筑中，钢结构得到了广泛的使用，取得了很大的经济及社会效益。钢框架结构是多层和高层建筑的主要结构体系之一。而钢框架结构梁柱节点连接的好坏则是实现结构强度与延性的关键。但在1994年Northridge和1995年阪神地震中，梁柱连接发生了大量的脆断现象，显示出了人们对于钢框架梁柱栓焊连接节点认识上的不足。为了避免人员伤亡和财产损失，研究新的、性能优良的节点连接方式，找出新型节点在循环荷载作用下的破坏机理，提出新的节点构造和抗震设计对策，不仅具有重要的理论意义，同时也具有重大的工程意义。 目前的抗震设计“强柱弱梁”原则是利用梁上的塑性铰来消耗能量；“强节点弱杆件”原则是为了弥补“常用设计法”所带来的不足。节点的设计，集中到一点，就是如何实现延性设计。 本文采用试验研究、理论分析、有限元程序分析相结合的方法，对钢框架梁柱T型节点连接的形式进行了系统的分析与研究。 本次试验共进行了四组试验，分别考虑了梁柱螺栓连接的铰接连接、半刚性连接以及梁柱栓焊连接的刚性连接。整个过程真实再现了梁柱连接的三种连接形式的工作过程，通过数据的记录、整理，得出了一些比较客观的规律。 为了便于比较，为了更加精确地模拟梁柱焊接和螺栓共同连接的形式在循环荷载作用下的脆断行为，本文在试验的基础上，采用了有限元软件ANSYS进行了分析。实体模型的建立，考虑了接触区的状态非线性，以模拟高强螺栓的预拉力、螺栓连接区的摩擦接触，对承受轴力的梁柱刚性连接方式在循环荷载作用下的滞回性能进行了计算分析。 最后，通过对比分析，得出了一些具有实际工程意义的结论与建议，对工程设计具有重要的参考价值，同时也为进一步的研究梁柱连接节点的新型形式打下良好的基础。更多还原

【Abstract】 As a result of the advantages of steel structure buildings, at the same time with fast speed of output of steels, they appear quickly in recent years, especially for multi-story and high-rise building, steel structures are widely used, and good economic and social benefits are obtained. One of dominating structural systems is steel moment frames. Moreover, whether beam-to-column connections are good or not, it is a key of realizing structural intensity and ductility. But during the 1994 Northridge Earthquake and 1995 Hyogoken-Nanbu Earthquake, beam-to-column connections experienced a great deal of brittle fracture phenomenon, which indicated that the performance on the damage mechanism of some style joints were rather inadequate. In order to avoid similar damage in future, investigation of some further new and finer joint types of the beam-column connections, analyses of the damage mechanism of new joints types under cyclical load and advance of new aseismatic design measure are not only significant from the theoretical aspect, but also important in practice.At present, strong column weak beam principle is to consume energy in virtue of plastic-hinge which comes into being in the beam, strong joints weak pole is used to make up some shortage of common design method. How to design connections of the column to the beam, the way that is required is to how to realize ductility design of joints.In this paper, experiment study, theoretic analysis, FEM program are combined, T-type connections of beam-to-column are carried out systems analysis and research.In this experiment, four groups tests were made, including pin-connected, semi-rigid connection of bolted beam-to-column connections, rigid connection of welded flange-bolted web beam-to-column connections. The whole process reappeared work truth of three types connection of beam-to-column, by dint of recording data, trimming, some useful disciplines are obtained.In order to contract and to predict the brittle fracture behavior of welded-bolted beam-to-column joints under cyclical load, on the basis of experiments, software ANSYS was adopted to analysis the results. In order to predict high-strength bolts pretension and contact-friction in contact zone, status nonlinear in contact zone is adopted in FEM model. The computation and analysis on the behavior of beam-to-column rigidity joints subjected to constant axial pressure on the top of column and cyclical load at tip of beam is carried out.At last, some conclusions and design recommendations are provided for actual practice, they are very useful for engineering design. This paper plays a basis role of more investigation about beam-to-column connections.更多还原