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（1 華南理工大學(xué)土木與交通學(xué)院， 廣州 510641； 2 亞熱帶建筑科學(xué)國家重點(diǎn)實(shí)驗(yàn)室， 廣州 510641； 3 澳大利亞新南威爾斯大學(xué)土木與環(huán)境學(xué)院CIES研究中心, 悉尼 NSW 2052）

［摘要］為了解新型鋼管混凝土柱-混凝土梁節(jié)點(diǎn)在地震后的力學(xué)性能，對(duì)經(jīng)歷了低周反復(fù)荷載作用的節(jié)點(diǎn)試件進(jìn)行軸壓試驗(yàn)，探討該新型節(jié)點(diǎn)在軸壓荷載作用下的破壞形態(tài)、極限承載力及其應(yīng)變特點(diǎn)。試驗(yàn)結(jié)果表明，試件在軸壓過程出現(xiàn)兩種不同的破壞形式，其中節(jié)點(diǎn)截面尺寸較小的試件表現(xiàn)為節(jié)點(diǎn)的破壞，而節(jié)點(diǎn)截面尺寸較大的試件則表現(xiàn)為柱鋼管屈曲失效，并明確兩種不同的破壞形式中，節(jié)點(diǎn)鋼筋網(wǎng)在震后帶損傷的情況下仍能夠充分發(fā)揮其強(qiáng)度，節(jié)點(diǎn)在鋼筋網(wǎng)約束與擴(kuò)大橫截面的局壓受力機(jī)理作用下其承載力得到提高。通過合理設(shè)計(jì)的新型節(jié)點(diǎn)的承載力可高于鋼管混凝土柱的承載力，可實(shí)現(xiàn)“強(qiáng)節(jié)點(diǎn)，弱構(gòu)件”的抗震理念。

［關(guān)鍵詞］鋼管混凝土柱-混凝土梁節(jié)點(diǎn); 不貫通鋼管; 軸心受壓

中圖分類號(hào)：TU398  文獻(xiàn)標(biāo)識(shí)碼：A  文章編號(hào)：1002-848X(2014)04-0015-06

Axial compression experimental research on the new type concrete-filled steel tubular column-concrete beam joint after cyclic loadings

Chen Qingjun1,2,3, He An1, Cai Jian1,2, Tang Xulin1, Zhang Yulin1

(1 School of Civil and Transportation Engineering, South China University of Technology, Guangzhou 510641, China; 2 State Key Laboratory of Subtropical Building Science, Guangzhou 510641, China; 3 Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, The University of New South Wales, UNSW, Sydney NSW 2052, Australia)

Abstract: In order to investigate the mechanical behavior of the new type concrete-filled steel tubular column-beam joint after earthquake, the axial compression experiment was carried out on specimens after cyclic loadings. The failure modes, the ultimate bearing capacity and the features of the strains were discussed. The results indicate that two failure modes occur in the test. For specimen joints with small cross section, failure region is concentrated within the joint. On the contrary, for those with larger cross section, failure is the buckling of concrete-filled steel tubular column. After the earthquake, the mat reinforcement of joints can still give full play to its strength and the capacity of the joints increases by the confinement of mat reinforcement and local compressive effect of the enlarged cross section. Through the reasonable design, the bearing capacity of the joint zone is higher than concrete-filled steel tubular column, which meets the seismic design requirement of weak member and strong joint.

Keywords: concrete-filled steel tubular column-beam joint; discontinuous steel tube; axial compression

*華南理工大學(xué)亞熱帶建筑科學(xué)國家重點(diǎn)實(shí)驗(yàn)室自主研究課題項(xiàng)目(2013ZC19)，中央高?；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(2014ZZ0026)，廣東省自然科學(xué)基金資助項(xiàng)目(9451064101002910)。

作者簡(jiǎn)介：陳慶軍，博士，副教授，Email:qjchen@scut.edu.cn。

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