单轴对称钢梁截面组合节点的抗震性能试验研究
Experimental study on seismic performance of composite connections with single axisymmetric steel beam section
投稿时间:2021-07-21  修订日期:2021-09-17
DOI:
中文关键词:  钢框架  组合节点  单轴对称钢梁截面  抗震性能  拟静力试验
英文关键词:steel frame  composite connections  single axisymmetric steel beam section  seismic performance  quasi-static tests
基金项目:国家自然科学基金项目(面上项目)
作者单位邮编
徐莹璐 西安建筑科技大学 710055
苏耀烜 长安大学 
尚永芳 长安大学 
郝际平 西安建筑科技大学 710055
郑宏 长安大学 
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中文摘要:
      为减小钢框架梁柱组合节点中梁下翼缘焊缝脆性破坏的风险,提出了采用单轴对称钢梁截面的梁柱组合节点形式,完成了3个1:2的组合节点试件的拟静力试验研究,分别考虑标准型钢梁截面、上窄下宽且仅梁下翼缘削弱型及仅梁下翼缘扩翼型组合节点试件,对各试件的破坏过程、滞回行为、关键部位的应变发展、耗能性能及延性等进行了详细分析。结果表明,焊缝质量有所保证的组合节点试件其加载点的荷载-位移滞回曲线饱满,具有良好的耗能性能;仅梁下翼缘扩翼型组合节点试件的塑性铰在扩翼板末端的钢梁截面上形成,在梁下翼缘反复屈曲的过程中母材逐渐开裂并向腹板延伸;正弯矩作用下组合梁截面的中和轴靠近梁上翼缘,从而显著加大了梁下翼缘处的应变水平;单轴对称钢梁截面组合节点形式有助于实现梁上塑性铰外移,减小梁下翼缘焊缝处的应变集中程度;实际工程中应切实保证梁翼缘对接焊缝的质量。
英文摘要:
      In order to reduce the brittle failure risk of the lower flange welds of steel frame beam-column composite connections, the beam-column composite connection with a single axisymmetric steel beam section was proposed. The quasi-static tests of three 1:2 composite connection specimens were conducted, and the specimens with the standard steel beam section, narrower beam upper flange and wider beam lower flange with weakened the beam lower flanges only, and widened the beam lower flanges only were considered. The failure process, hysteretic behavior, strain development of key sections, energy dissipation and ductility of each specimen were analyzed in detail. Results showed that, composite connection specimens with guaranteed weld quality had full load-displacement hysteresis curves at the loading point and good energy dissipation performance. The plastic hinge of the specimen with widened the beam lower flanges occurred in the steel beam section at the end of widened flange plates, and in the process of repeated buckling, the beam lower flange gradually cracked and extended to the steel web. Under the positive bending moment, the neutral axis of the composite beam section was close to the beam upper flange, leading to large strain level at the beam lower flange. The composite connection with a single axisymmetric steel beam section was conducive to move the plastic hinge away from the column face and thus reduce the strain concentration at the beam lower flange. The quality of beam flange butt welds should be guaranteed strictly in practical engineering.
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