钢框架梁柱狗骨式节点受力性能的有限元分析-结构工程专业论文.docxVIP

The The Finite Element Analysis Research on Working Behavior of Reduced Bearn Section Connections ABSTRACT 11le beam-column connections are crucial for multi and high storeys．In the past， they are designed into rigid joints，which call resist horizontal load and earthquake load．But In the Northridge Earthquake and Kobe Earthquake，lots of血e traditional rigid{oints of steel frame appeared brittle failures and the plastic deformation did not happen in the beam at all-TheY were not up to the seismic fortification criterion．So researchers try to develop a new style ofjoints to enhance the aseismatic capability of steel frame．Reduced Bcanl Section style connection is one of tlle most popular connection style． Researchers believe that the weakened section will yield first under the earthquake． when the rational man-made weakening was taken on the beam flange．And the plastic hinge will appear on the weakened section finally． With the exiting data．Finite Element Analysis for steel frame with Reduced Beam Section style beam．column connections was performed with ANSYS numerical simulation in this PaDer．It analyzes the changes and distribution of stress of this connection．A comparison of fatigue behavior under different stress amplitude is carded out in the ANSYS fatigue calculation function．The aim is to see the contribution which the Reduced Beam Section do to the super high cycle fatigue behavior and the low cycle fatigue． Key words： reduced beam section numerical simulation fatigue 插图清单图1．1常见的刚性节点构造形式 插图清单 图1．1常见的刚性节点构造形式 一l 图1-2 NORTHRIDGE地震中梁柱焊接连接处的失效模式 2 图2-1加强式节点示意图 图2-2削弱式节点示意图 “ 图2．3狗骨式节点示意图 ”8 图2-4狗骨式节点几何参数示意图 ”8 图2．5截面应力分布 ”9 图3．1 4盯—_Ⅳ曲线图和LGJ盯一￡GⅣ曲线图 ·20 图3．2应交一寿命的山L4N$ON-COFFIN公式 20 图3．3疲劳极限图近似模型 22 图3-4雨流计数法 25 图3．5寿命评估过程 26 图3-6三种寿命预测方法的关系 26 图3-7疲劳破损过程 ·28 图3-8漏斗形试件 28 图4．1 SOLⅢ45几何形状图 · ··33 图4-2材料非线性属性 33 图4．3几何模型 34 图4-4狗骨式节点有限元模型 35 图4-5约束模型 35 图4．6梁端力加载模型 36 图4．7梁端力120KN时应力云图 ”36 图4．8梁端力160KN时应力云图 ．．-． “36 图4-9梁端力170KN时应力云图 ”37 图4-10梁端力220KN时应力云图 37