重慶出口加工區(qū)卡口鋼拱結(jié)構(gòu)動力特性分析
崔 佳 曾 強(qiáng) 龍莉萍
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(重慶大學(xué)土木工程學(xué)院 400045)
[提要]重慶出口加工區(qū)卡口根據(jù)建筑造型的需要，設(shè)計為兩榀斜交放置的大跨度箱形鋼拱結(jié)構(gòu)，而兩相交鋼拱間采用了較柔性的鋼管相連。由于此鋼拱結(jié)構(gòu)的剛度分布極不均勻，對抗震及抗風(fēng)設(shè)計均不利。在結(jié)構(gòu)計算中，采用大型通用有限元分析程序ANSYS，通過提取不同振型及頻率，運(yùn)用振型分解反應(yīng)譜法對其動力特性及地震反應(yīng)進(jìn)行了分析。[關(guān)鍵詞]鋼拱結(jié)構(gòu) 動力特性 有限元分析Abstract: The tollgate of Chongqing Export Industrial Park was designed to be a pair of sloped arches intercrossing in space, and linked by a row of steel tubes in order to satisfy specified requirements of architect. The structure rigidity is not uniform, so it is in a disadvantageous condition when imposed by wind or earthquake loads. A numeric model of space arch was established to calculate its behavior under static and climatic loads by using the ANSYS software. The authors discuss problems encountered during applying spectrum analysis, and gave some advice.Keywords: space steel arch; dynamic character; finite element method
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