腹板摩擦式自定心预应力混凝土框架梁柱节点的试验研究
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摘要
提出了一种腹板摩擦式自定心预应力混凝土框架梁柱节点形式,并通过14个低周反复加载试验,对节点在循环荷载下的力学行为以及耗能特性进行研究,分析钢绞线预应力、螺杆预应力、梁端钢套、螺旋箍筋等参数对于节点性能的影响。试验结果表明,腹板摩擦式自定心预应力混凝土框架梁柱节点具有震后自动复位、主体结构基本无损、耗能机制明确等优点。梁端的钢套避免了混凝土梁柱在相对转动时的局部受压破坏,而位于梁端腹板的摩擦装置则提供了良好的耗能能力。随着初始预应力的加大,节点的初始刚度、临界张开弯矩加大并具有更强的自定心能力;节点的耗能效果主要受摩擦力的大小控制,预应力螺杆的正应力越大,耗能效果越明显。为保证槽钢的传力和摩擦耗能效果,须加强柱预埋钢板在框架柱中的锚固。
A beam-column connection of self-centering prestressed concrete(SCPC) frame with web friction devices is proposed.Mechanical behavior and the energy dissipation(ED) mechanism are investigated through fourteen low cyclic tests.The influence of parameters(initial tendon forces,initial bolt forces,steel jacket at the beam end and spiral hoops,etc.) on the performances of the connections are analyzed.Test results show that the SCPC connection has a good self-centering capacity and an explicit ED mechanism,and that the beams and columns can be damage-free after earthquake.The steel jacket at the beam ends avoids local crushing of the concrete as the beam rotates against the column.The friction device at the beam web provides the ED capacity.As the initial prestressing forces increase,higher initial stiffness,imminent gap-opening moment and larger self-centering capacity are obtained.The ED capacity is mainly controlled by the friction forces.The larger the normal forces of the friction bolts are,the better the ED effect is.To ensure the transfer of friction loads from channels and the energy dissipation,the anchorage of the embedded steel plates in the column needs to be enhanced.
A beam-column connection of self-centering prestressed concrete(SCPC) frame with web friction devices is proposed.Mechanical behavior and the energy dissipation(ED) mechanism are investigated through fourteen low cyclic tests.The influence of parameters(initial tendon forces,initial bolt forces,steel jacket at the beam end and spiral hoops,etc.) on the performances of the connections are analyzed.Test results show that the SCPC connection has a good self-centering capacity and an explicit ED mechanism,and that the beams and columns can be damage-free after earthquake.The steel jacket at the beam ends avoids local crushing of the concrete as the beam rotates against the column.The friction device at the beam web provides the ED capacity.As the initial prestressing forces increase,higher initial stiffness,imminent gap-opening moment and larger self-centering capacity are obtained.The ED capacity is mainly controlled by the friction forces.The larger the normal forces of the friction bolts are,the better the ED effect is.To ensure the transfer of friction loads from channels and the energy dissipation,the anchorage of the embedded steel plates in the column needs to be enhanced.
引文
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[7]罗青儿,王蕴,翁煜辉,等.装配整体式钢筋混凝土框架梁柱节点的试验研究[J].工业建筑,2009,39(2):80-83(Luo Qinger,Wang Yun,Weng Yuhui,et al.Experimental study of beam-column joint of precastmonolithic R.C.frame[J].Industrial Construction,2009,39(2):80-83(in Chinese))
[8]董挺峰,李振宝,周锡元.装配式混凝土框架结构及其抗震性能研究[J].建筑技术,2006,37(11):844-847(Dong Tingfeng,Li Zhenbao,Zhou Xiyuan.Studies onpre-cast concrete frame structure and its anti-seismicperformance[J].Architecture Technology,2006,37(11):844-847(in Chinese))
[9]柳炳康,田井锋,张瑜中,等.低周反复荷载下预压装配式PC框架延性性能和耗能能力[J].建筑结构学报,2007,28(3):74-81(Liu Bingkang,Tian Jingfeng,ZhangYuzhong,et al.Behavior of ductility and energy dissipationof prestressed precast concrete frame under low-cyclicreversed loading[J].Journal of Building Structures,2007,28(3):74-81(in Chinese))
[2]Garlock M E M.Design,analysis,and experimental behaviorof seismic resistant post-tensioned steel moment resistingframes[D].Bethlehem,Pennsylvania:Lehigh University,2002
[3]Wolski M E.Experimental evaluation of a bottom flangefriction device for a self centering seismic moment resistantframe with post-tensioned steel moment connections[D].Pennsylvania:Lehigh University,2006
[4]Lin Y C,Ricles J,Sause R,et al.Earthquake simulationson a self-centering steel moment resisting frame with webfriction devices[C]//Proceedings of the 2009 StructuresCongress,2009
[5]Christopoulos C,Filiatrault A,Uang C M,et al.Posttensionedenergy dissipating connections for moment-resisting steelframes[J].Journal of Structural Engineering,2002,128(9):1111-1120
[6]赵斌,吕西林,刘丽珍.全装配式预制混凝土结构梁柱组合件抗震性能试验研究[J].地震工程与工程振动,2005,25(1):81-87(Zhao Bin,Lu Xilin,Liu Lizhen.Experimental study on seismic behavior of precast concretebeam-column subassemblage with fully assembled joint[J].Earthquake Engineering and Engineering Vibration,2005,25(1):81-87(in Chinese))
[7]罗青儿,王蕴,翁煜辉,等.装配整体式钢筋混凝土框架梁柱节点的试验研究[J].工业建筑,2009,39(2):80-83(Luo Qinger,Wang Yun,Weng Yuhui,et al.Experimental study of beam-column joint of precastmonolithic R.C.frame[J].Industrial Construction,2009,39(2):80-83(in Chinese))
[8]董挺峰,李振宝,周锡元.装配式混凝土框架结构及其抗震性能研究[J].建筑技术,2006,37(11):844-847(Dong Tingfeng,Li Zhenbao,Zhou Xiyuan.Studies onpre-cast concrete frame structure and its anti-seismicperformance[J].Architecture Technology,2006,37(11):844-847(in Chinese))
[9]柳炳康,田井锋,张瑜中,等.低周反复荷载下预压装配式PC框架延性性能和耗能能力[J].建筑结构学报,2007,28(3):74-81(Liu Bingkang,Tian Jingfeng,ZhangYuzhong,et al.Behavior of ductility and energy dissipationof prestressed precast concrete frame under low-cyclicreversed loading[J].Journal of Building Structures,2007,28(3):74-81(in Chinese))
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