(同济大学建筑设计研究院(集团)有限公司, 上海 200092)

摘要: 珠海市横琴新区某商业项目中庭单层网壳边界为多段圆弧构成的异形边界,结构设计采用力学找形方法确定网壳形态,满足建筑效果的同时赋予建筑形态物理力学意义. 对几何找形和力学找形单层网壳的极限稳定承载力和应变能进行分析与比较. 结果表明,在本工程的异形边界条件下,无论是几何找形还是力学找形单层网壳,半跨分布的荷载对结构受力都更加不利. 在满跨和半跨不同的荷载分布情况下,力学找形单层网壳都具有更高的极限稳定承载能力,但力学找形单层网壳对初始缺陷更加敏感,同时也发现力学找形单层网壳结构的应变能比几何找形单层网壳结构更低,说明力学找形单层网壳的结构刚度更大,承载效率更高.

关键词: 单层网壳结构; 力学找形; 几何找形; 极限稳定承载力; 应变能

中图分类号:TU393. 3 文献标志码:A 文章编号:1002-848X(2022)05-0148-06

DOI:10. 19701 / j. jzjg. LS210097

Structural form-finding and analysis for the single-layer latticed shell withspecial-shaped boundary

JU Wei

( Tongji Architectural Design (Group) Co., Ltd., Shanghai 200092, China)

Abstract: The boundary of the single-layer latticed shell in the atrium of a commercial project in Zhuhai Hengqin NewDistrict is a special-shaped boundary formed by multiple arcs. The structural design adopts a mechanical form-findingmethod to determine the form of the latticed shell, which satisfies the architectural effect and gives the building form aphysical and mechanical meaning. The ultimate stability bearing capacity and strain energy of geometric form-finding andmechanical form-finding single-layer latticed shells were analyzed and compared. The results show that under thespecial-shaped boundary conditions of this project, whether it is geometric form-finding or mechanical form-findingsingle-layer latticed shell, the half-span distributed load is more unfavorable to the structural force. Below the different loaddistributions in the full-span and half-span, mechanical form-finding single-layer latticed shells have higher ultimatestability bearing capacity, but mechanical form-finding single-layer latticed shells are more sensitive to initial defects. Atthe same time, it is also found that the strain energy of mechanical form-finding single-layer latticed shells is higher thanthat of geometric from-finding single-layer latticed shells, which indicates that the structural rigidity of the mechanicalform-finding single-layer latticed shells is greater and the load-bearing efficiency is higher.

Keywords:single-layer latticed shell structure; mechanical form-finding; geometric form-finding; ultimate stability bearingcapacity; strain energy

第一作者:居炜,硕士,高级工程师,国家一级注册结构工程师,主要从事于建筑结构设计,Email:32jw@ tjad. cn.

[引用本文] 居 炜. 异 形 边 界 单 层 网 壳 结 构 找 形 与 分 析 [ J] . 建 筑 结 构, 2022, 52 ( 5) : 148-153, 147. JU Wei.Structural form-finding and analysis for the single-layer latticed shell with special-shaped boundary[ J] . Building Structure,2022,52(5) :148-153,147.