\r张锡治^{1, 2}，章少华³，徐盛博³，李青正³，李星乾\r³\r
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AuthorsHTML:\r张锡治^{1, 2}，章少华³，徐盛博³，李青正³，李星乾\r³\r
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AuthorsListE:\rZhang Xizhi^{1, 2}，Zhang Shaohua³，Xu Shengbo³，Li Qingzheng³，Li Xingqian\r³\r
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AuthorsHTMLE:\rZhang Xizhi^{1, 2}，Zhang Shaohua³，Xu Shengbo³，Li Qingzheng³，Li Xingqian\r³\r
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Unit:\r1. 天津大学建筑设计研究院，天津 300072；
2. 滨海土木工程结构与安全教育部重点实验室(天津大学)，天津 300072；
3. 天津大学建筑工程学院，天津 300072\r
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Unit_EngLish:\r1. Architectural Design & Research Institute of Tianjin University，Tianjin 300072，China；
2. Key Laboratory of Coast Civil Structure Safety of Ministry of Education，Tianjin University，Tianjin 300072，China；
3. School of Civil Engineering，Tianjin University，Tianjin 300072，China\r
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Abstract_Chinese:\r\r为研究端板与柱间灌浆层对端板连接\rRCS\r节点抗震性能的影响，以端板与柱间灌浆层厚度、灌浆层强度以及螺栓预拉力为主要研究参数，进行了\r4\r个端板连接\rRCS\r节点试件的低周反复加载试验．基于试验数据，研究了各试件的破坏形态、滞回性能、承载能力、刚度退化规律、延性、耗能能力和变形组成等．试验结果表明：强柱弱梁型端板连接\rRCS\r节点的破坏形态为梁铰破坏机制，灌浆层出现压碎脱落现象，整个受力过程中钢梁端板、灌浆层和柱面之间连接紧密，未出现滑移现象，端板和\rRCS\r节点之间的连接和传力可靠，表现出良好的受力性能．各试件滞回曲线呈梭形，梁端塑性铰充分耗散能量，具有较好的抗震性能；反复荷载作用下端板与柱间灌浆层的损伤累积导致节点延性和耗能能力降低，其降低幅度随灌浆层损伤程度增加而增大；各试件刚度退化规律基本一致，灌浆层的损伤累积导致刚度退化加剧；节点的变形主要来自钢梁的变形，在整个加载过程中，各试件端板连接变形较小，在极限位移角时，试件\rRCS1\r、\rRCS3\r和\rRCS4\r由端板连接变形引起的位移所占比例分别为\r1.5\r%\r、\r1.8\r%\r和\r2.7\r%\r．各试件弯矩\r-\r转角关系曲线呈现出明显的非线性特征，试件\rRCS1\r～\rRCS4\r按刚度分类均属于半刚接节点，节点初始转动刚度随灌浆层厚度增加而提高，但提高幅度有限．\r\r
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Abstract_English:\r\rTo study the influence of a grout layer between an end-plate and a column on seismic behavior of end-plate-connection RCS joints\r，\rwe conducted a test in which four end-plate-connection RCS joints were put under cyclic loads with grout layers of different thicknesses and strengths between an end-plate and a column with pretension in a bolt\r．\rBased on experimental data\r，\rwe analyzed failure modes\r，\rhysteresis behavior\r，\rbearing capacity\r，\rstiffness degradation law\r，\rductility\r，\renergy dissipation capacity\r，\rand deformations of the joints\r．\rThe test results indicate that end-plate-connection RCS joints that are designed according to the strong column-weak beam concept show a typical plastic-hinge failure mode at the end of the steel beam\r．\rPartial crushing of the grout layer was observed during the test\r．\rThroughout the test period\r，\rthe connection among the end-plate\r，\rgrout layer\r，\rand column was tight and no slippage was observed\r．\rThe connection and transmission forces of the end-plate-connection RCS joints were reliable and showed good structural behavior\r．\rEach specimen exhibited good seismic behavior and had shuttle-shaped hysteresis curves\r．\rThe plastic-hinge deformation at the end of the beam resulted in good energy dissipation capacity\r．\rThe accumulation of damage to the grout layer between the end-plate and the column under cyclic loads resulted in reduced ductility and energy dissipation at the joints\r，\rand when damage to the ground layer was considerably serious\r，\rthe ductility and energy dissipation of the joints decreased rapidly\r．\rStiffness degradations of each specimen were almost the same\r，\rand the accumulation of damage to the grout layer accelerated the stiffness degradation of the joints\r．\rDeformations of the joints were mainly caused by the steel beam\r，\rand the rotation of the end-plate was small throughout the test period\r．\rWhen rotation failures occurred in specimens RCS1\r，\rRCS3\r，\rand RCS4\r，\rthe ratios of the deformation caused by the rotation of the end-plate to the total deformation were 1.5\r%\r，\r1.8\r%\r and 2.7\r%\r，\rrespectively\r．\rThe bending moment-rotation curves of each specimen show obvious nonlinear characteristics. Specimens RCS1\r—\rRCS4 are categorized as having semi-rigid connections\r．\rThe initial rotational stiffness of joints improves when the thickness of the grout layer increases\r，\rbut the range of improvement is limited\r．\r\r
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Keyword_Chinese:RCS节点；端板连接；灌浆层；抗震性能；弯矩-转角关系；半刚接节点\r

Keywords_English:RCS joint；end-plate-connection；grout layer；seismic behavior；moment-rotation relationship；semirigid connections\r


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