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（1 武漢大學(xué)土木建筑工程學(xué)院， 武漢 430072； 2 中南建筑設(shè)計(jì)院股份有限公司， 武漢 430070）

［摘要］以武漢天河機(jī)場(chǎng)T3航站樓為工程背景，對(duì)航站樓屋蓋結(jié)構(gòu)中典型空間相貫節(jié)點(diǎn)（X+KT形節(jié)點(diǎn)）的靜力性能進(jìn)行了足尺試驗(yàn)研究和有限元分析。根據(jù)最不利設(shè)計(jì)荷載工況,對(duì)節(jié)點(diǎn)試件進(jìn)行多點(diǎn)同步加載，得到了節(jié)點(diǎn)的受力性能、破壞模式和各桿件變形。根據(jù)試驗(yàn)節(jié)點(diǎn)實(shí)測(cè)尺寸建立非線性有限元分析模型，對(duì)試驗(yàn)節(jié)點(diǎn)進(jìn)行數(shù)值模擬，計(jì)算結(jié)果與試驗(yàn)結(jié)果吻合良好。試驗(yàn)結(jié)果和有限元分析表明：試驗(yàn)節(jié)點(diǎn)具有較高的安全儲(chǔ)備，其破壞模式為受壓支管根部局部屈曲破壞。由于試驗(yàn)節(jié)點(diǎn)存在主管強(qiáng)、支管弱的特點(diǎn)，節(jié)點(diǎn)破壞不屬于規(guī)范規(guī)定的主管過(guò)度塑性變形的破壞模式，因此規(guī)范中的承載力計(jì)算公式不再適用，運(yùn)用有限元分析方法計(jì)算相貫節(jié)點(diǎn)承載力是一種有效的方法。

［關(guān)鍵詞］空間相貫節(jié)點(diǎn)； 足尺試驗(yàn)； 有限元分析； 承載力

中圖分類號(hào)：TU392-3, TU317-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2018)09-0083-05

Experimental and numerical study on mechanical behavior of multi-planar steel tubular joint

Du Xinxi1, Yin Pengfei1, Yuan Huanxin1, Yang Hao1, Yuan Liming2

(1 School of Civil Engineering, Wuhan University, Wuhan 430072, China; 2 Central-South Architectural Design Institute Co.,  Ltd.,  Wuhan 430070, China)

Abstract:Based on the roof structure of T3 terminal in Wuhan Tianhe International Airport, the static behavior of multi-planar steel tubular joint (X+KT-joint) was studied by test and finite element analysis. According to the most unfavorable design condition, the multi-point synchronous loading of joint specimens was carried out. The bearing capacity, failure mode and deformation curves of the tested joint were obtained. By means of the measured geometric dimensions of the tested joint, finite element model was established to carry out the numerical simulation of test joints. The results show that the calculated results are consistent with the test results. The test and  finite element analysis  results observe that the tested tubular joint owns relatively high strength reserve, and its failure mode is local buckling of the end part of the compressive brace tube. Because of the characteristics of strong supervisor and weak branch line in test node, the joint damage does not belong to failure mode of superplastic deformation in the Chinese code. The formula of bearing capacity calculation in the specification is no longer applicable， and it is an effective method to calculate the bearing capacity of nodal intersections by using finite element analysis method.

Keywords:multi-planar joint; full-scale test; finite element analysis; bearing capacity

*國(guó)家自然科學(xué)基金資助項(xiàng)目(51508424)，中央高?；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(2042016kf1125)。

作者簡(jiǎn)介：杜新喜，教授，博士生導(dǎo)師，Email：duxinxi@163.com。