實(shí)腹式型鋼混凝土十字形柱抗震性能研究*
李凱文1，2，王玉玲2，萬鑫2，張波3
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（1 無錫環(huán)境科學(xué)與工程研究中心， 無錫 214153； 2 無錫城市職業(yè)技術(shù)學(xué)院， 無錫 214153； 3 同濟(jì)大學(xué)結(jié)構(gòu)工程與防災(zāi)研究所， 上海 200092）
［摘要］對(duì)4個(gè)不同軸壓比、配鋼率、加載方向的實(shí)腹式型鋼混凝土十字形柱進(jìn)行了低周反復(fù)加載試驗(yàn)，通過觀測試件各階段的開裂變形及破壞形態(tài)，并分析其破壞機(jī)理，得到其荷載位移滯回曲線、骨架曲線、剛度退化、強(qiáng)度衰減、耗能能力及位移延性系數(shù)。通過分析試件的位移延性系數(shù)，得到影響實(shí)腹式型鋼混凝土十字形柱延性的主要因素。結(jié)果表明，實(shí)腹式型鋼混凝土十字形柱試件在其剪跨比為3.25時(shí)發(fā)生彎曲破壞形態(tài)；軸壓比較高時(shí)，試件強(qiáng)度衰減幅值較小，試件達(dá)到極限承載力后剛度退化較快，延性降低；配鋼率加大，試件極限承載力有較大提高，強(qiáng)度衰減和剛度退化相對(duì)平穩(wěn)；相同條件下，沿45°方向加載的試件極限承載力比沿工程軸加載的試件極限承載力高，且達(dá)到極限承載力后剛度退化較快。［關(guān)鍵詞］十字形柱; 實(shí)腹式型鋼; 軸壓比; 配鋼率; 抗震性能中圖分類號(hào)：TU398+.7 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2015)22-0080-05
Research on seismic behavior of solid-web steel reinforced high-performance concrete cross-shaped columnLi Kaiwen1,2, Wang Yuling2, Wan Xin2, Zhang Bo3（1 Center of Environment Civil Engineering, Wuxi 214153, China; 2 Wuxi City College of Vocational Technology, Wuxi 214153,China; 3 Research Institute of Structural Engineering & Disaster Reduction,Tongji University, Shanghai 200092, China)Abstract: A series of low cyclic loading tests were carried out on 4 solid-web steel reinforced concrete cross-shaped columns with different axial compression ratios, steel ratios and loading directions. Through the observation of cracking and failure modes in each process and analysis of failure mechanism, the load-displacement hysteresis curves were obtained as well as skeleton curves, stiffness degradation, strength degradation, energy dissipation capacity and displacement ductility coefficients. The main factors which influence the ductility of the column were studied by analyzing displacement ductility coefficients. The test results indicate that the column will bend failure with the shear span ratio of 3.25. When the axial pressure is relatively high, the attenuation amplitude of the specimen strength is smaller, and the stiffness degradation is faster while the ductility decreases. When the steel ratio increases, the ultimate bearing capacity of the specimen is improved, and the strength attenuation is relatively smooth as well as stiffness degradation. Under the same conditions, the ultimate bearing capacity of the specimen along the loading direction of 45°is higher than that of the specimen along the loading direction of engineering axis, and the stiffness degradation of the former one is more rapid than the latter one.Keywords: cross-shaped column; solid-web steel; axial compression ratio; steel ratio; seismic behavior
*江蘇省第四期“333工程”培養(yǎng)資金省級(jí)資助項(xiàng)目（BRA2012027）。作者簡介：李凱文，研究員級(jí)高級(jí)工程師，Email：996817275@qq.com。
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