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(華東建筑設(shè)計(jì)研究院有限公司， 上海 200002)

［摘要］以上海某在建工程為背景，系統(tǒng)介紹了空間網(wǎng)格結(jié)構(gòu)設(shè)計(jì)過程中所需考慮的問題。對(duì)于此類自由曲面結(jié)構(gòu)設(shè)計(jì)過程中應(yīng)考慮的基本計(jì)算假定進(jìn)行概述；對(duì)于此自由曲面結(jié)構(gòu)進(jìn)行了彈性狀態(tài)下的位移分析，基于本結(jié)構(gòu)特殊形態(tài)，對(duì)于位移組成進(jìn)行定性分析，有針對(duì)性地采取相應(yīng)措施控制整體變形量；進(jìn)行了彈性狀態(tài)下強(qiáng)度分析，分析結(jié)果表面桿件應(yīng)力組成以薄膜應(yīng)力為主， 由于建筑造型及網(wǎng)格限制，局部桿件軸力較大，根據(jù)分析結(jié)果針對(duì)性加強(qiáng)相應(yīng)薄弱部位；進(jìn)行了屈曲分析，基于第1階彈性屈曲模態(tài)作為初始幾何缺陷的分布形式進(jìn)行了考慮幾何非線性的彈塑性極限承載力分析，結(jié)果表明,喇叭花單層空間網(wǎng)格結(jié)構(gòu)的整體穩(wěn)定性滿足要求。

［關(guān)鍵詞］空間網(wǎng)格結(jié)構(gòu)； 彈塑性分析； 屈曲分析； 自由曲面

中圖分類號(hào)：TU393-3文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)23-0044-06

Analysis and research on design of a single-layer free-form surface grid steel structure

Zhang Qi， Wang Hongjun， Huang Yuying， Zou Jin

(East China Architectural Design & Research Institute Co.,  Ltd.， Shanghai 200002， China)

Abstract:Based on a project under construction in Shanghai, the issues to be considered in the design of spatial grid structure were systematically introduced. The basic calculation assumptions that should be considered in the design process of this kind of free-form surface structure were summarized. The displacement analysis of this free-form surface structure in the elastic state was carried out. Based on the special shape of this structure, the qualitative analysis of the displacement composition was carried out, and the corresponding measures were taken to control the overall deformation. The strength analysis in the elastic state was carried out, and the stress composition of the surface members was mainly membrane stress according to the analysis results. Due to the limitation of the building shape and grid, the axial force of the local members was large. According to the analysis results, the corresponding weak parts were strengthened pertinently. The buckling analysis was carried out. Based on the first order elastic buckling mode as the distribution form of the initial geometric defects, the elastic-plastic ultimate bearing capacity analysis was analyzed considering geometric nonlinearity. Results show that the overall stability of bellflower single-layer spatial grid structure meets the requirements.

Keywords:spatial grid structure; elastic plastic analysis; bulking analysis; free-form surface

作者簡(jiǎn)介：張齊，碩士，工程師，Email:zq19770@ecadi.com。