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Effects of Shear Behavior of Column-to-Beam Joint Panels on Beam Frexural Behavior

柱梁连接板的剪切行为对梁弯曲行为的影响

基本信息

批准号：
11650585
负责人：
TABUCHI Mototsugu
金额：
$ 1.79万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650585/
关键词：
Column-to-Beam Joint Panel Panel to Beam Strength Ratio Connection Detail Charpy Absorbed Energy Strain Concentration Brittle Fracture Plastic Deformation Capacity Transition Temperature 有限要素解析パネル耐力比スカラップ

项目摘要

When moment resisting steel frames are subjected to severe earthquake, high shear stress occurs in the panel zones of column-to-beam connections. The shear deformation of panel zones may induce secondary stress into the beam flange at the connection, and may cause the brittle fractures at the beam end In this study, loading tests were carried out to investigate the effects of the shear deformation of panel zones on the beam flexural behavior. Further, for the purpose of examining the strain distribution at the connection, numerical elasto-plastic analyses were carried out by using the finite element program. The Mowing conclusions can be made :1. The shear deformation of panel zones induces secondary stress into the beam flange at the connection, and increases the strain concentration at the beam flange.2. If the fracture toughness of the beam flange material is high, the brittle fracture of the beam flange cannot occur in early stage. So, the shear yielding of the panel zone can relieve the amount of plastic deformation that must be accommodated in the beam. As the result, the deformation capacity of frames increases as the panel to beam strength ratio decreases.3. In the case of the beam flange with low fracture toughness, the brittle fracture of the beam flange occurred, even if the panel to beam strength ratio was 0.85. In these tests, the fracture mode (ductile or brittle) depends on the test temperature rather than the panel to beam strength ratio. Therefore, although the panel yielding precedes the beam yielding, it is necessary to avoid the use of the beam flange with low fracture toughness, or to improve the connection detail in order to keep out the occurrence of shear cracks.

在强震作用下，抗弯钢框架柱梁连接节点的节点区会产生较高的剪应力。板区剪切变形会在连接处的梁翼缘产生二次应力，并可能导致梁端的脆性断裂。本文通过加载试验研究了板区剪切变形对梁受弯性能的影响。此外，为了检查连接处的应变分布，通过使用有限元程序进行了数值弹塑性分析。可以得出以下结论：1。板区的剪切变形在梁翼缘处产生次应力，增加了梁翼缘处的应变集中.如果梁翼缘材料的断裂韧性高，梁翼缘不会在早期发生脆性断裂。因此，面板区域的剪切屈服可以减轻梁中必须容纳的塑性变形量。结果表明，框架的变形能力随着板梁强度比的减小而增大.对于断裂韧性较低的梁翼缘，即使板梁强度比为0.85，梁翼缘也发生脆性断裂。在这些试验中，断裂模式（韧性或脆性）取决于试验温度，而不是板梁强度比。因此，尽管板的屈服先于梁的屈服，但仍有必要避免使用断裂韧性低的梁翼缘，或改进连接细节以防止剪切裂缝的发生。