勁性環(huán)梁式鋼管混凝土節(jié)點滯回性能試驗研究*
趙毅1，徐禮華2
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(1 中原工學(xué)院建筑工程學(xué)院， 鄭州 450001； 2 武漢大學(xué)土木建筑工程學(xué)院， 武漢 430072)
［摘要］進(jìn)行了10個勁性環(huán)梁式鋼管混凝土節(jié)點的低周往復(fù)荷載的試驗研究，探討了牛腿長度、環(huán)梁截面尺寸、鋼筋錨固方式、軸壓比對節(jié)點破壞和抗震性能的影響。結(jié)果表明：此類節(jié)點有效實現(xiàn)了梁鉸破壞機(jī)制，滿足強柱弱梁的設(shè)計原則；牛腿長度及環(huán)梁截面尺寸是影響節(jié)點力學(xué)性能的主要因素，隨著牛腿長度及環(huán)梁截面尺寸的增加，節(jié)點的耗能能力及延性系數(shù)均增加，破壞模式由脆性破壞變?yōu)檠有云茐?；鋼筋搭接于鋼牛腿翼緣即可滿足節(jié)點的抗震性能。［關(guān)鍵詞］勁性環(huán)梁; 鋼管混凝土; 節(jié)點; 滯回性能; 試驗研究中圖分類號：TU398+.7 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2015)22-0085-06
Experimental study on hysteretic behavior of concrete filled steel tube joints with steel reinforced ring-beamsZhao Yi1, Xu Lihua2（1 Architecture and Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450001, China; 2 School of Civil Engineering, Wuhan University, Wuhan 430072, China）Abstract: Low cyclic reversed experiments were carried out on ten specimens of concrete filled steel tube joints with steel reinforced ring-beams. The influences of length of the steel bracket, sectional dimension of the ring-beams, anchorage method of reinforcement and axial compression ratio on joint failure and seismic performance were discussed. The results show that such joints realize the beam hinge failure mechanism effectively, and satisfy the design principle of strong column and weak beam. Length of the steel bracket and sectional dimension of the ring-beam are the main factors affecting the mechanical properties of the joints. With the increase of the length of steel bracket and sectional dimension of the ring-beams, energy dissipation capacity and ductility coefficient of the joints increase, and the failure mode changes from brittle fracture to ductile failure. Lapping of bars in the flange of the steel bracket can meet the requirement of seismic behavior of the joint.Keywords: steel reinforced ring-beam; concrete filled steel tube; joint; hysteretic behavior; experimental study
*國家青年自然科學(xué)基金資助項目(51408621)，河南省科學(xué)技術(shù)廳基礎(chǔ)與前沿技術(shù)研究計劃資助項目（132300410472），河南省高等學(xué)校重點科研項目（15A560046）。作者簡介：趙毅，博士，講師，Email:zhaoyi091218@163.com。
