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（中國(guó)建筑科學(xué)研究院，北京 100013）

［摘要］建立了端部約束鋼管混凝土柱耐火性能分析的有限元計(jì)算模型，并通過試驗(yàn)驗(yàn)證了計(jì)算模型的正確性。同時(shí)，利用上述模型，考慮轉(zhuǎn)動(dòng)約束、軸向約束及軸向約束與轉(zhuǎn)動(dòng)約束的組合以及偏心距的影響，對(duì)火災(zāi)下端部約束鋼管混凝土柱的變形形態(tài)、內(nèi)力重分布、耐火極限等進(jìn)行了系統(tǒng)的參數(shù)研究。研究表明，軸向約束和轉(zhuǎn)動(dòng)約束增加了柱的耐火能力，而軸向約束的效果更好；軸向約束條件下，柱的變形為單曲率變形，轉(zhuǎn)動(dòng)約束條件下，柱為雙曲率變形；軸向約束和轉(zhuǎn)動(dòng)約束共同作用下，火災(zāi)作用下柱的撓曲變形較小，耐火性能較好。

［關(guān)鍵詞］結(jié)構(gòu)工程； 約束； 鋼管混凝土柱； 耐火性能； 變形

中圖分類號(hào)：TU398+.2文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2018)04-0050-06

Fire performance of end-restrained concrete filled steel tubular columns

Wang Guangyong, Qiu Canghu, Wang Li

(China Academy of Building Research, Beijing 100013, China)

Abstract:A finite element (FE) model was established to simulate the performance of end-restrained concrete filled steel tubular (CFST) columns subjected to fire, and the results of the FE model agreed well with the test results. Then, a detailed parametric research was carried out to study the deformation, internal force redistribution and the fire resistance of the CFST columns considering the bend restraint, the axial  restraint and the combination of the two restraints, as well as the effect of eccentric ratio by using the FE model. At the same time, the eccentric ratio of the concentrated force loaded on the column ends was chosen one of the parameters. The results show that the axial restraint and the bend restraint can increase the fire resistance of the CFST column, and the axial restraint has more effects than the bend restraint. The deformation of the CFST columns is a single curvature when the axial restraint is used, and the deformation is a double curvature when the bend restrained is used, while the deflection deformation is small and the fire resistance is good when the axial and bend restraint are used at the same time.

Keywords:structural engineering; restraint; concrete filled steel tubular column; fire-resistant performance; deformation

*國(guó)家自然科學(xué)基金項(xiàng)目(51778595)，中國(guó)建筑科學(xué)研究院自籌基金項(xiàng)目(20140111330730062)。

作者簡(jiǎn)介：王廣勇，博士，研究員，Email：wanggy0609@163.com。