世博会主题馆预应力混凝土梁-钢骨变截面劲性柱节点设计及试验研究
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摘要
为研究预应力混凝土梁-钢骨变截面劲性柱节点的破坏特征及受力性能,进行了4个模型试件的低周反复荷载试验。观察了各节点的受力过程及破坏形态,并分析了试件的荷载-位移滞回曲线、骨架曲线、承载能力和延性等力学特性。结果表明:预应力混凝土梁-钢骨变截面劲性柱节点典型破坏形态是梁端弯剪破坏,该类节点的延性与混凝土梁柱节点相似,位移延性系数为2.0,柱内钢骨可提高节点的承载能力及刚度;柱内钢骨变截面可有效改善节点的延性性能,而对承载能力没有影响;节点处混凝土的浇筑质量对节点的整体受力性能影响较大。最后对该类节点给出了设计及施工建议。试验研究成果可为预应力混凝土梁-钢骨变截面劲性柱节点工程研究及应用提供参考。
In order to investigate the failure modes and the mechanical behavior of joints of prestressed beam and steel reinforced concrete column of variable steel sections,four specimens were tested under reversed cyclic loading.The failure process and patterns were observed.The mechanical behavior such as the load-displacement hysteresis loops,skeleton curves,load carrying capacity,and ductility were analyzed.It is shown that the main failure patterns of the joints of prestressed beam and reinforced concrete column of variable steel section are shear-bending at the beam root.The ductility of such joint is similar to concrete joint,the ductility factor of displacement is 2.0.Steel member in column can increase load carrying capacity and stiffness.Ductility of joints would be improved by using steel column of variable sections,however it is not effective to increase load carrying capacity.Poor quality of concrete have great effect upon mechanical behavior of the joints.Suggestions for design and construction are also presented.
In order to investigate the failure modes and the mechanical behavior of joints of prestressed beam and steel reinforced concrete column of variable steel sections,four specimens were tested under reversed cyclic loading.The failure process and patterns were observed.The mechanical behavior such as the load-displacement hysteresis loops,skeleton curves,load carrying capacity,and ductility were analyzed.It is shown that the main failure patterns of the joints of prestressed beam and reinforced concrete column of variable steel section are shear-bending at the beam root.The ductility of such joint is similar to concrete joint,the ductility factor of displacement is 2.0.Steel member in column can increase load carrying capacity and stiffness.Ductility of joints would be improved by using steel column of variable sections,however it is not effective to increase load carrying capacity.Poor quality of concrete have great effect upon mechanical behavior of the joints.Suggestions for design and construction are also presented.
引文
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[2]YB 9082—2006钢骨混凝土结构技术规程[S].(YB 9082—2006 Technical specification for steel-reinforced concrete structures[S].(in Chinese))
[3]房贞政,陈伟恩,郑则群.劲性柱-钢梁节点拟静力试验研究[J].地震工程与工程振动,2003,23(2):45-50.(FANG Zhenzheng,CHEN Weien,ZHENGZequn.Quasi static experimental study on joint of steelconcrete composite structure[J].EarthquakeEngineering and Engineering Vibration,2003,23(2):45-50.(in Chinese))
[4]张海霞,周兴国,朱浮声,等.钢骨高强混凝土框架节点拟动力试验研究[J].东北大学学报:自然科学版,2004,25(8):796-798.(ZHANG Haixia,ZHOUXingguo,ZHU Fusheng,et al.Experimental study onframe joints of steel-encased high-strength reinforcedconcrete with dynamics simulation[J].Journal ofNortheastern University:Natural Science,2004,25(8):796-798.(in Chinese))
[5]程文襄,高仲学,苏毅,等.钢骨混凝土柱框架节点的试验研究[J].建筑结构学报,2002,23(2):36-40.(CHENG Wenrang,Gao Zhongxue,SU Yi,et al.Experimental study of frame joints with steel reinforcedconcrete column[J].Journal of Building Structures,2002,23(2):36-40.(in Chinese))
[6]郭子雄,庄云,黄群贤,等.SRC柱-RC梁组合件抗震性能试验研究[J].建筑结构学报,2009,30(2):39-46.(GUO Zixiong,ZHUANG Yun,HUANG Qunxian,et al.Experimental study on seismic behaviors of SRCcolumn-RC beam hybrid subassemblies[J].Journal ofBuilding Structures,2009,30(2):39-46.(inChinese))
[7]薛建阳,赵鸿铁,杨勇.型钢混凝土节点抗震性能及构造方法[J].世界地震工程,2002,18(2):61-63.(XUE Jianyang,ZHAO Hongtie,YANG Yong.Seismic behavior and construction method of steelreinforced concrete joints[J].World EarthquakeEngineering,2002,18(2):61-63.(in Chinese))
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