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Development of plastic shear link and upgrade of steel structural ductility

塑料剪力连接件开发及钢结构延性升级

基本信息

批准号：
09450179
负责人：
FUKUMOTO Yuhshi
金额：
$ 6.08万
依托单位：
FUKUYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450179/
关键词：
cyclic load plastic shear link ductility steel pier plate girder low yield steel 繰り返しせん断荷重塑性リンクダクティリティー斜張力場極低降伏点鋼

项目摘要

This report is to develop the plastic shear link concept which is applicable to the seismic-resistant dissipation of bridges. A total of twelve welded 1-section specimens is tested under cyclic shear loading. The length and height of the specimens are 2240mm and 800mm, respectively with the web thickness of 4, 5, and 7mm. The web is separated in two square panels with 800mm width by the vertical stiffeners. The width and the thickness of the flanges are 300mm and l2mm, respectively. Steel grades of the web are mild steel of SM400 and low yield steel of LY100.Followings are the main research results from the cyclic shear loading tests :The specimens made of the mild steel reach to the maximum shear load at the beginning of the loading cycles, and the shear load capacity gradually decreases to the constant shear force. The webs of these specimens collapse one side. The specimens made of the low yield steel gradually reach to the constant shear force at the large shear displacement of the loading cycles due to the strain hardening of the materials. The webs of these specimens collapse both sides. The constant shear load capacity decreases when the flanges largely deform toward the web at the extremely large shear displacement. The energy dissipation increases in proportion to the shear displacement. The thicker webs are more effective in the shear load capacity and the energy dissipation. The low yield steel is more effective than the mild steel in the energy dissipation.

本文提出了适用于桥梁抗震耗散的塑性剪力杆概念。在循环剪切荷载作用下，共对12个焊接单截面试件进行了试验。试件长2240mm，高800mm，腹板厚度4、5、7mm。腹板由两个800mm宽的方形板由垂直加强筋隔开。法兰的宽度和厚度分别为300mm和l2mm。腹板的钢种为SM400低碳钢和LY100低碳钢。循环剪切加载试验的主要研究结果如下：低碳钢试件在加载周期开始时达到最大剪切荷载，剪切承载能力逐渐降低至恒剪切力。这些标本的网有一侧塌陷。由于材料的应变硬化，低屈服钢试样在大剪切位移加载循环下逐渐达到恒定剪切力。这些标本的蛛网两侧塌陷。在剪切位移极大的情况下，当翼缘向腹板发生较大变形时，其恒剪承载力下降。能量耗散随剪切位移成比例增大。较厚的腹板在抗剪承载力和耗能方面更有效。低碳钢比低碳钢耗能更有效。