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(清華大學(xué)土木工程系結(jié)構(gòu)工程與振動(dòng)教育部重點(diǎn)實(shí)驗(yàn)室，北京 100084)
［摘要］介紹了3個(gè)鋼筋混凝土梁-鋼管混凝土組合柱節(jié)點(diǎn)試件在梁端豎向往復(fù)荷載作用下的試驗(yàn)研究，其中一個(gè)為梁彎曲破壞的“強(qiáng)核芯區(qū)弱梁”試件，兩個(gè)為核芯區(qū)剪切破壞的“強(qiáng)梁弱核芯區(qū)”試件。試驗(yàn)結(jié)果表明，三個(gè)試件都有大的變形能力，但峰值荷載時(shí)弱核芯區(qū)試件的核芯區(qū)剪切變形占節(jié)點(diǎn)總變形的50%以上，而強(qiáng)核芯區(qū)試件的這一比例很?。蝗鹾诵緟^(qū)試件核芯區(qū)的箍筋和鋼管屈服，而強(qiáng)核芯區(qū)試件核芯區(qū)的箍筋和鋼管未屈服；弱核芯區(qū)試件的耗能能力小于強(qiáng)核芯區(qū)試件的；對(duì)于核芯區(qū)破壞的試件，減小核芯區(qū)的箍筋間距，可以增大節(jié)點(diǎn)的耗能能力和減小核芯區(qū)的剪切變形。
［關(guān)鍵詞］鋼筋混凝土梁-鋼管混凝土組合柱節(jié)點(diǎn)；核芯區(qū)；抗震性能；試驗(yàn)
Tests on seismic behavior of RC beam-composite steel tube confined concrete column joints
Qian Jiaru, Jiang Yuan(Key Laboratory for Structural Engineering and Vibration of Education Ministry,Department of Civil Engineering, Tsinghua University，Beijing 100084, China)
Abstract:Tests about three reinforced concrete beam-composite steel tube confined concrete column joint specimens under cyclic loads at the beam cantilever ends are introduced. Among three specimens, one was strong core and weak beam specimen, and two were strong beam and weak core specimens. Test results show that all specimens have large deformation capacity, but at the peak load more than 50% of the total deformation of the weak core specimens is contributed by the shear deformation of the core, while this ratio of the strong core specimen is small. The stirrups and the tube in the core of the weak core specimens yield while those of the strong core specimen do not yield. The energy dissipation capacity of the weak core specimens is smaller than that of the strong core specimen. For the weak core specimens, reducing the stirrup space can increase the energy dissipation capacity and decrease the shear deformation of the core.
Keywords:RC beam-composite steel tube confined concrete column joint; core area; seismic behavior; test
*國(guó)家自然科學(xué)基金重大研究計(jì)劃重點(diǎn)項(xiàng)目(90815025)。
作者簡(jiǎn)介：錢稼茹，教授，Email:qianjr@tsinghua.edu.cn。
參考文獻(xiàn)
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［2］GB50010—2002混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范［S］. 北京：中國(guó)建筑工業(yè)出版社，2002.
［3］MEINHEIT D F, JIRSA J O. Shear strength of RC beam-column connections［J］. Journal of Structural Engineering, ASCE, 1981, 107(11): 2227-2244.