常规设计中，钢框架梁柱节点连接设置双腹角钢连接、平端板连接以承受竖向荷载，设计中将节点假定为铰接，不传递任何弯矩，只传递全部竖向剪力。采用支撑体系来抵抗侧向力。1994年美国北岭地震震后调查结果显示，钢框架结构的抗侧力体系在承受严重破坏后，设计中被认为只承受竖向荷载的钢框架成为第二道抗震体系，继续承受地震荷载，取得一定得效果，而这正是设计中所忽略的。在中心支撑结构体系中，假定支撑与节点板的连接在支撑屈服、或体系中其他非弹性变形之前发生出现断裂，将会大大的降低钢支撑框架的抗震延性，此时带节点板的钢框架成为最主要的抗震体系，因此需要对该结构梁柱节点的刚度、强度进行探究。
因为缺乏必要的试验论证，本文拟采用有限元软件ABAQUS对带支撑节点板的梁柱连接节点进行足尺建模。由于连接节点中存在复杂的接触、预应力以及数量庞大的单元，因此有必要对建立的模型进行单元选择、合理部件简化和选取适当分析方法。首先建立了一个简化高强螺栓连接部件，分别采用了降温法、bolt load两种方法施加螺栓的预应力，对比两种方法数值结果发现：采用实体单元而言，两种方法计算结果接近，建议当连接节点存在大量的高强螺栓时采用降温法。本文提出的MPC beam简化螺栓单元可以提升计算速度会，但是需要选择适当的个数的连接单元。采用壳单元模拟连接板件后，导致连接刚度偏大，因此需要慎重选择壳单元。
采用实体单元、隐式算法，并根据实际的连接节点尺寸，本文建立了16个不同尺寸与构造的有限元模型，经过综合分析对比得出：考虑节点板的影响与未考虑节点板的影响，节点的初始转动刚度与强度出现很大的变化，考虑节点板后，节点的力学性能具有明显的半刚性；在双腹板角钢的基础上增加底角钢、或增加角钢厚度，对节点的初始转动刚度与强度有明显的提高；将平端板设置为外伸端板或增加端板的厚度，能提高节点初始转动刚度与强度。
ABSTRACT
In conventional design, steel frame beam-column connections are set with double web Angle or flush end plate connections to withstand vertical load, the designedconnectionareassumed as the simple connection, which not to pass any moment, just passed the whole vertical shear load. Brace system is used to resist lateral force. After The 1994 Northridge earthquake investigation, according to the results of the lateral force resistant system of steel frame structure after suffering serious damage, is considered only bear vertical load in the design of steel frame as the second seismic system, continue to resist seismic load, achieved a certain surprisedeffect, which is ignored in the common design. In centrically braced frames, the assumption is that gusset plate connection appear rupture before the buckling of brace or other inelastic behavior, this situation is the extreme situation in the earthquake and greatly reduce the seismic ductility of steel braced frame, steel frame with gusset plate as the main seismic system in this time, so we need to research the structural performance of the beam-column joints.
Because of the lack of the necessary test, this paper use the finite element software ABAQUS to modeling the full-scale connections. However, in connection with a large number of complexcontact and pre-stress, so it is necessary to model the connections by reasonable and proper selection of components to simplify analysis method.Bolt pre-stress load are applied by the method of temperature change and bolt load item in ABAQUS, the results of the two methods are reliable for solid element, and summarized the applicable range of the two methods in the thesis. The MPC beam simplified model can simplify the high strength bolt connection, as the same time computing speed will greatly improve, but need to selection of the number of connectors to a certain amount of analysis and comparison. After using SHELL element, the connection will be rigid, the results is comparatively large difference, so of SHELL element selection should be carefully.
16Finite element models were considered in this chapter 4, through comprehensive analysis comparison: considering the influence of connections with or without gusset plate, the initial rotational stiffness and strength appear very large change, after considering gusset, mechanics performance has obvious semi-rigid behavior. the double web angles with gusset plate increase seat Angle, or increase the thickness of the Angle, initial rotational stiffness and strength of the connection has obvious enhancement. Sets the flush end plate to extended end plate or increase the thickness of end plate, can improve the initial rotational stiffness and strength.
目录
摘要 1
ABSTRACT 3目录 1
第1章 绪论 1
1.1 研究背景与意义 1
1.2 国内外研究现状 3
1.2.1 国内研究现状 3
1.2.2 国外研究现状 4
1.3 本文主要研究内容 7
第2章 有限元分析基本理论 8
2.1 有限元分析的优点 8
2.2 连接分析的特点 8
2.3 ABAQUS分析设置选择 9
2.3.1 分析类型和求解器选择 9
2.3.2 实体单元（solid element） 10
2.3.3 壳单元（shell element） 11
2.3.4 梁单元（beam element） 12
2.3.5 连接单元（connector element） 12
2.3.6 接触定义 13
2.4 本章小结 14
第3章 高强螺栓连接模型简化分析 15
3.1 引言 15
3.2 模型尺寸 15
3.3 高强螺栓连接预应力施加方法对比 16
3.3.1 Bolt load方法 16
3.3.2 降温法 17
3.3.3 降温法与bolt-load方法结果对比 18
3.4 连接板采用实体单元、螺栓采用梁单元 19
3.5 壳单元简化模型 21
3.6 显式算法（ex
