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A study on seismic performance of semi-rigid connection in steel frame

钢框架半刚性连接抗震性能研究

基本信息

批准号：
04452242
负责人：
MORITA Koji
金额：
$ 3.33万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452242/
关键词：
Steel frame RHS column Composite beam Semi-rigid connection Hysteretic characteritic Lateral strength Lateral rigidity Local failure 合成ばりエネルギー吸収能力

项目摘要

The connection type, which the steel element of the composite beam is welded directly to the steel flange of the rectangular hollow section (RHS) column without any diaphragms, was selected for an example of the semi-rigid composite joint.The composite beam-and-RHS column subassemblage specimens, whose connection strength are of the following three categories classified by the strength ratio of the semi-rigid connection to the composite beam member, that is (i) the yielding of the beam flange is expected in advance of the connection, (ii) the yielding of the beam flange is expected after the connection, and (iii) the failure of the connection is expected in advance of the yielding of the beam flange, were carried out. The hysteretic characteristic of the subassemblages is stable spindle type until the drift angle of 1/25 regardless of the difference of failure mode. And the relationship between the moment (jM) and local rotational angle of the connection (jrheta) is obtained for each connection.Three 2 bay-2 story unbraced steel frames consisted of the composite beams and RHS columns, whose beam-to-column connections without diaphragms are of the above three categories, were tested. The obtained load-drift angle relationship of each frame is stable spindle type with satisfactory deformation capacity regardless of the difference of failure mode. The effect of the semi-rigid behavior of the connection on the structural behaviors of the frames is analyzed by using the rotational spring model for the connection.In addition, as jM-jrheta relationships of this type connections can be analyzed precisely by the three dimensional elasto-plastic finite element method, the formulation of the jM-jrheta relationship of the connections is possible by accumulating the results of the case studies by the finite element analysis.

以半刚性组合节点为例，选择将组合梁的钢单元直接焊接到矩形空心截面柱的钢法兰上，而不需要任何隔板的连接方式。采用组合梁- rhs柱组合试件，按照组合梁构件的半刚性连接强度比，将组合梁- rhs柱的连接强度分为三类，即(1)连接前预期梁翼缘屈服，(2)连接后预期梁翼缘屈服，以及(3)连接在梁翼缘屈服前预期破坏。无论失效模式的不同，在漂移角为1/25之前，组件的滞回特性都是稳定的主轴型。得到了每个连接的力矩（jM）与连接局部转角（jrheta）之间的关系。试验了3个由组合梁和RHS柱组成的2湾2层无支撑钢框架，其无隔板的梁柱连接属于上述三种类型。得到的各框架的载荷-漂移角关系无论破坏模式的不同都是稳定的主轴型，具有满意的变形能力。采用连接的转动弹簧模型，分析了连接的半刚性性能对框架结构性能的影响。此外，由于该类型连接的jM-jrheta关系可以通过三维弹塑性有限元方法精确分析，因此可以通过有限元分析积累案例研究的结果来制定连接的jM-jrheta关系。