地震下可恢复框架结构冷弯型钢构件试验研究
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摘要
对地震时作为多层建筑抗弯钢架能量耗散构件的薄壁冷弯型钢(CFS)进行了试验研究。试验采用6个螺栓连接的梁-柱节点,在连接区域的板件和梁的翼缘上使用不同的出平面加劲肋。CFS连接件的滞后性能表明其具有较高的耗能能力和足够的延性,满足抗震设计规范的要求。在连接区域的钢梁内使用出平面加劲肋,能够提高连接件的弯矩-转角特性,强度提高35%,延性提高75%。弹性周期后连接件的滑动使其具有较好的滞回性能,能量耗散能力提高了240%。连接件试样可以作为刚性连接,其全部或部分强度取决于连接加劲肋。
This paper presents an experimental investigation on the use of thin-walled cold-formed steel (CFS) sections as energy dissipative elements for earthquake resistant moment frame multi-storey buildings. The tests were performed on six bolted beam-to-column connections, using through plates and curved flange beams with different types of out-of-plane stiffeners in the connection region. The hysteretic behaviour of the CFS connections shows high seismic energy dissipation capacity and sufficient ductility to satisfy code requirements for seismic design. The use of out-of-plane stiffeners inside the beams in the connection region results in improvement of the moment–rotation behaviour of the connection by up to 35% in strength and 75% in ductility. Mobilising connection slip after the elastic cycles provides highly stable hysteretic behaviour and an increase of up to 240% in energy dissipation capacity. The tested connections can be classified as rigid with partial or full strength depending on the connection stiffeners.
This paper presents an experimental investigation on the use of thin-walled cold-formed steel (CFS) sections as energy dissipative elements for earthquake resistant moment frame multi-storey buildings. The tests were performed on six bolted beam-to-column connections, using through plates and curved flange beams with different types of out-of-plane stiffeners in the connection region. The hysteretic behaviour of the CFS connections shows high seismic energy dissipation capacity and sufficient ductility to satisfy code requirements for seismic design. The use of out-of-plane stiffeners inside the beams in the connection region results in improvement of the moment–rotation behaviour of the connection by up to 35% in strength and 75% in ductility. Mobilising connection slip after the elastic cycles provides highly stable hysteretic behaviour and an increase of up to 240% in energy dissipation capacity. The tested connections can be classified as rigid with partial or full strength depending on the connection stiffeners.
引文
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