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（山東科技大學(xué)山東省土木工程防災(zāi)減災(zāi)重點(diǎn)實(shí)驗(yàn)室，青島 266510）

［摘要］以矩形鋼管為弦桿、圓管為支桿的混合空間鋼管結(jié)構(gòu)因形式新穎、相貫線切割簡(jiǎn)單而在大跨空間結(jié)構(gòu)中逐漸得以應(yīng)用，但因支桿的幾何效應(yīng)和荷載效應(yīng)，導(dǎo)致混合型鋼管空間相貫節(jié)點(diǎn)承載力計(jì)算比較復(fù)雜。采用非線性有限元方法，應(yīng)用自動(dòng)步長(zhǎng)增量法研究了主方支圓空間KT節(jié)點(diǎn)的空間幾何效應(yīng)和荷載效應(yīng)。理論分析表明：相比桿件的幾何效應(yīng)，荷載效應(yīng)對(duì)節(jié)點(diǎn)極限承載力的影響更為明顯，T形支桿上較大的軸力將使K形支管處極限承載力顯著下降。通過對(duì)空間KT形節(jié)點(diǎn)極限承載力的分析，繪制平面K形、T形節(jié)點(diǎn)和空間KT形節(jié)點(diǎn)承載力相關(guān)曲線，并提出計(jì)算公式供設(shè)計(jì)人員參考。

［關(guān)鍵詞］空間管節(jié)點(diǎn)；空間效應(yīng)；荷載效應(yīng)；自動(dòng)步長(zhǎng)增量法；極限承載力

中圖分類號(hào)：TU3923文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2011)08-0079-04

Research on space effect and ultimate bearing capacity of multiplanar KT-type steel tubular joints with square chords and circular braces

Deng Peng, Wang Lai, Liu Yan(Key Lab of Civil Engineering Disaster Prevention and Mitigation of Shandong Province, SUST, Qingdao 266510, China)

Abstract:The hybrid multiplanar steel tubular structure with rectangular steel tubes as the chords and circular tubes as the braces is used in large span and space structures because of its novel style, straight welded joints which could be cut simply, and convenient field construction. However, the calculation of the bearing capacity of hybrid multiplanar steel tubular joints is relatively complex due to the geometric effect and load effect of braces. Using nonlinear finite element method and  automatic step incremental algorithm,  the space geometric effect and load effect were researched for KT-type steel tubular joints with square chords and circular braces. Theoretical analysis result shows that compared with the geometric effect of braces, the influence of load effect on  the ultimate bearing capacity of joints is more apparent, and larger axial force in T-type braces could significantly reduce the ultimate bearing capacity of K-type braces. Through the analysis of the ultimate bearing capacity of multiplanar KT-joints,  correlation curves of the bearing capacity of planar K-joints, T-joints, and multiplanar KT-joints were established, and calculation formulas which can be referenced by engineers were raised.

Keywords:multiplanar tubular joints; space effect; load effect; automatic step incremental algorithm; ultimate bearing capacity

* 山東科技大學(xué)科學(xué)研究“春蕾計(jì)劃”項(xiàng)目(2008AZZ103) 。

作者簡(jiǎn)介：鄧芃，副教授，Email:dengpeng1226@163.com。

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