钢框架新型节点力学性能有限元分析-结构工程专业论文.docxVIP

Finite Finite element analysis on mechanical behavior of new style Steel frames beam．column connections Abstract The steel framework is one of the commonly used structural systems in modern constructions．During the 1994 Northridge and 1995 Kobe earthquake， the typical beam-column connections in steel moment·resisting frame suffered brittle failures．After the two erthquakes，beam—column connections and its influence on the steel frameworks’seismic behavior became one foeUS． Reduced beam—column connections are one kind of these new style connections，the familiar style include the Reduced beam section(Dog--bone) and the Weakend web．These new styles connections in order to make the plastic hinge moved out wothout reducing carrying capacity of beam—column comlections obviously，and to protect the brittle connection area．then the ductility of the connections can be improved and the ductile design on steel frame can be realized，This paper use big finite element program to analyse many models with different parameters of the two types reduced beam·column connections．The aim is to know every parameter how to influenee eonnetions carrying capacity and the hysteresis behavior．Through the research and analisis，the paper give the reasonable parameters of the two types reduced cOnnectiOns． Through this paper’s research，we can get some conclusions：reasonable reduced parameters to the twe type reduced connections can make the plastic hinge move out to protect the brittle corrections’Rrea，and can without reduelng the carrying capacity,seismic behavior obviously,the ductility of connetions can be improved． Keywerds：reduced beam—column connections；plastic hinge；seismic behavior； hysteresis behavior；ductile design 插 插 图 清 单 图1．1北岭地震前普遍采用的梁柱节点 ． ． ． ．8 图1．2加强型节点示意图．． ． ．． ．． 8 图1，3两种常见的削弱式节点 ．．．． ． ．9 图L 4狗骨式节点形式 ．．． ． ． ． 9 图1．5狗骨式粱柱节点原理 ． 10 图I．6腹板开洞式节点 ．．．．． ．． ． ． ．．11 图2．1全焊接梁柱节点 ． ． 17 图2．2高强螺栓连接梁柱刚节点． ．．18 图2．3栓焊混合型梁柱节点 ． ． ．．20 图3．I标准节点模型和两种削弱式节点 26 图3．2