不同材料强化加层节点抗震性能试验研究
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摘要
为了研究轻钢结构加层中节点加固后的抗震性能,设计制作了一个传统植筋节点和2种不同材料强化节点进行拟静力试验,对3种不同形式的加层中节点的破坏现象、滞回曲线、骨架曲线、刚度退化、耗能能力以及2种材料的强度利用率等进行了分析研究.研究结果表明:3个轻钢结构加层节点的破坏形态均为梁铰破坏,这2种新型节点的抗震性能均优于传统植筋节点,其中外包钢强化节点的滞回曲线最为饱满,耗能能力最强,承载力最高;碳纤维强化节点能够延缓节点的开裂.
In order to study the seismic behavior of the strengthened medium nodes between adding steel story and concrete frame,the pseudo-static tests were carried out among the three types of nodes strengthened by traditional plant steel,carbon fiber sheet and encased steel separately.Performance of the three specimens was evaluated in terms of failure phenomena,hysteretic curves,skeleton curves,stiffness degradation,energy dissipation and efficiency of the two strengthening materials.Results show that all joints failures are due to the plastic hinges formed at the end of the beams;the seismic performance of the two new types of joints strengthened by encased steel and carbon fiber sheet is better than the traditional plant steel one,and the hysteresis curve envelope area of outer steel plate strengthening joint is the biggest,and its energy consumption capacity and bearing capacity are the most powerful;the node strengthened by carbon fiber sheet can slow down the speed of cracking.
In order to study the seismic behavior of the strengthened medium nodes between adding steel story and concrete frame,the pseudo-static tests were carried out among the three types of nodes strengthened by traditional plant steel,carbon fiber sheet and encased steel separately.Performance of the three specimens was evaluated in terms of failure phenomena,hysteretic curves,skeleton curves,stiffness degradation,energy dissipation and efficiency of the two strengthening materials.Results show that all joints failures are due to the plastic hinges formed at the end of the beams;the seismic performance of the two new types of joints strengthened by encased steel and carbon fiber sheet is better than the traditional plant steel one,and the hysteresis curve envelope area of outer steel plate strengthening joint is the biggest,and its energy consumption capacity and bearing capacity are the most powerful;the node strengthened by carbon fiber sheet can slow down the speed of cracking.
引文
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[9]GBT50107-2010,混凝土强度检验评定标准[S].
[10]GB/T228.1-2010,金属材料.拉伸试验.第1部分:室温试验方法[S].
[2]张涛.既有建筑顶部钢结构加层的结构设计与抗震性能分析[D].北京:清华大学,2005.
[3]王燕,徐永春.轻钢增层结构模型的地震反应试验研究[J].力学与实践,1999,21(5):31-36.
[4]雷宏刚,秦纪平.轻钢结构增层可行性及相关问题研究[J].太原理工大学学报,2001,32(4):331-334.
[5]王燕,李金成.轻钢增层结构的研究与应用[J].青岛建筑工程学院学报,1998,20(3):10-13.
[6]崔艳秋,柳锋,崔涛.轻钢结构在建筑物增层设计应用中的若干问题[J].山东建筑工程学报,2001,16(3):30-33.
[7]宋锋.钢结构跃层加层技术及其工程应用研究[D].北京:清华大学,2004.
[8]吴培成.轻钢增层结构抗震设计方法的研究[D].兰州:兰州理工大学,2006.
[9]GBT50107-2010,混凝土强度检验评定标准[S].
[10]GB/T228.1-2010,金属材料.拉伸试验.第1部分:室温试验方法[S].
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