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(長(zhǎng)江大學(xué)城市建設(shè)學(xué)院,荊州 434023)
［摘要］以十字形截面鋼管混凝土異形柱-鋼梁框架中柱節(jié)點(diǎn)為研究對(duì)象，按1∶2比例設(shè)計(jì)了4個(gè)弱節(jié)點(diǎn)和強(qiáng)節(jié)點(diǎn)模型，通過(guò)施加恒定軸壓比的豎向荷載和低周反復(fù)水平荷載，對(duì)節(jié)點(diǎn)模型進(jìn)行了加載破壞試驗(yàn)。試驗(yàn)結(jié)果表明：弱節(jié)點(diǎn)試件破壞形態(tài)為節(jié)點(diǎn)核心區(qū)剪切破壞，隨軸壓比增大，試件受剪承載力提高，但其延性性能降低；強(qiáng)節(jié)點(diǎn)試件破壞形態(tài)為梁端受彎破壞，破壞前經(jīng)歷了較大的塑性變形，延性系數(shù)達(dá)到了5.65。由此可見(jiàn)，合理地設(shè)計(jì)鋼管混凝土異形柱-鋼梁框架中節(jié)點(diǎn)，可保證其延性破壞，實(shí)現(xiàn)“強(qiáng)柱弱梁，節(jié)點(diǎn)更強(qiáng)”的設(shè)計(jì)原則，滿足抗震性能要求。
［關(guān)鍵詞］異形截面柱；鋼管混凝土；框架節(jié)點(diǎn)；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(2012)03-0080-04
Experimental research on seismic behavior of interior joints in the composite frame consisting of CFST crisscross section columns and steel beams
Xu Chengxiang, Wan Bo, Zhang Jicheng, Ma Jinjun(School of Urban Construction, Yangtze University, Jingzhou 434023, China)
Abstract:By taking interior joints in the composite frame consisting of concrete-filled steel tubular(CFST) crisscross section columns and steel beams as the research objects, 4 one half scaled models of the weak joints and the strong joints were designed and manufactured, and the destruction test on the models was carried out under vertical stable loads and lateral cyclic loads. The test results show that the failure mode of the weak joints is the shear failure in the panel zone, and that of the strong joints is the bending failure at the beam end. With the increasing of the axial compression ratio, the shear bearing capacity of the weak joints increases, however, the deformation capacity and ductility decrease. The strong joint undergoes a large plastic deformation before the damage, and the effective ductility factor of the model reaches 5.51. The interior joint in the composite frame consisting of CFST crisscross section columns and steel beams has the ductile damage by the rational design, and meets the demands of seismic design, that is strong column, weak beam, stronger joint.
Keywords:special-shaped section column; concrete-filled steel tubular (CFST); frame joint; seismic behavior
* 國(guó)家自然科學(xué)基金項(xiàng)目（50978033）。
作者簡(jiǎn)介：許成祥，博士，教授，博士生導(dǎo)師，Email:cx_xu@sina.com。
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