【作者】 苏云鹏；

【导师】 郭秉山；

【作者基本信息】 西安科技大学 ， 结构工程， 2003， 硕士

【摘要】 钢框架梁柱端板连接是应用最为普遍的连接形式之一，但是由于其几何形态的复杂性，节点强度的计算方法并不十分令人满意。本文的目标在于要建立一个能够反映端板连接实际受力情况的节点强度计算模型。 为了使理论分析有充分而且精确的基本数据，本文改进了Bahaari和Sherbourne提出的四边形塑性壳单元有限元模型，建立了能够考虑焊缝、摩擦力和预应力等因素影响的端板连接节点的三维实体单元有限元模型。利用现有的有限元分析软件ANSYS对两个与实际试验试件具有相同尺寸的模型进行了计算，校正了有限元模型分析所应用的参数。对12个自行设计的有限元试件进行了计算并对计算结果进行了分析，同时研究了端板厚度、螺栓直径以及螺栓布置的变化对端板连接强度的影响。 在有限元计算的基础上，本文分析了影响节点强度的主要因素，包括：(1)螺栓和端板的强度；(2)柱翼缘的抗压强度；(3)柱腹板的抗压强度。通过对12个试件的有限元计算结果的分析，本文提出了一种新的端板强度计算方法，这种方法基于传统的T形件连接强度理论。新方法引入了腹板加强作用参数，提出了更为合理的端板连接节点处梁端截面的应力分布假设，能够很好地计算端板连接的强度。其计算过程分为两步：(1)计算梁受拉翼缘的极限拉力；(2)计算端板连接的极限弯矩。通过新方法计算结果与有限元计算结果的对比，证明了新方法计算简便、精度高、便于应用。 本文所建立的有限元模型也适用于其它端板连接性能的研究。本文给出的端板强度计算方法对于钢结构端板连接节点的设计有一定的参考价值。更多还原

【Abstract】 Because of the geometry complexity of bolted beam-column end-plate connections, the strength models presented in the past few decades can not predict the ultimate strength of end-plate connection in a satisfactory precision. So the goal of this paper is to establish a reasonable strength model of end-plate connections.The benchmark data for theoretical analysis are obtained by calculation results of finite element models. In order to have a sound finite element model, the plastic quadrilateral shell elements model established in 1996 by Bahaari and Sherbourne is improved by using solid 8 nodes elements in ANSYS programs. The improved finite model, calibrated by comparing the test data and the results of numerical calculation, can deal with the factors such as welding, contact and pretension. With the establishment of new model, total 12 finite element specimens, subdivided into 4 groups according to end-plate thickness, bolt diameter and bolt arrangement in two directions, are analyzed.Furthermore, in order to predict the force at beam tension flange when end-plate yields, Kulak method, applied to determine the ultimate strength of the T-stub connections, are modified by introducing a parameter C. The general solution of parameter C is also provided in this paper. Two hypothesises, different from the traditional viewpoints, about stress distribution in beam section at the connection of beam and end-plate are presented by author to determine the ultimate moment of end-plate connection.The finite element model established in this thesis can be used to study other capacities of end-plate connections. The method of predicting the ultimate strength of end-plate connections given in this thesis can be referred by designers.更多还原