A Numerical Analysis Model of Composite Pneumatic Formwork Considering The Stiffness Contribution of Polyurethane Layer

IF 1.1 Q3 ENGINEERING, CIVIL

Journal of the International Association for Shell and Spatial Structures Pub Date : 2023-01-01 DOI:10.20898/j.iass.2023.002

Gaoxiang Xu, Qiang Qing, Jinghai Gong

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引用次数: 0

Abstract

Pneumatic formwork is a kind of inflated fabric-polyurethane composite formwork formed by spraying polyurethane on the interior surface of the membrane. A numerical analysis model of composite pneumatic formwork considering the stiffness contribution of polyurethane is proposed to predict the structural response. The analysis model simulates the component of fabric and polyurethane with membrane elements and shell elements respectively, and Tie constraint of surface to surface is defined at the interface. A nonlinear material model for fabric is adopted considering the influence of stress ratio and loading history, and the constitutive relation of polyurethane is described in the foaming plane with different properties for tension and compression. Newton-Raphson incremental iterative method is used to solve the involved nonlinear problems. The simulation accuracy of the proposed analysis model is verified by comparing its predictions with test results about the load-deformation response of an inflated membrane structure and the corresponding composite pneumatic formwork under horizontal loading. The numerical model is further used to investigate the influence of the thickness of polyurethane layer on the improvement of overall structural stiffness of a larger pneumatic formwork under horizontal fresh gale, and the polyurethane is proved to be beneficial for the shape-control of pneumatic formwork.

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考虑聚氨酯层刚度贡献的复合气动模板数值分析模型

气动模板是一种通过在膜的内表面喷涂聚氨酯而形成的充气织物-聚氨酯复合模板。提出了一种考虑聚氨酯刚度贡献的复合气动模板数值分析模型，用于预测结构响应。该分析模型分别用膜单元和壳单元对织物和聚氨酯构件进行了模拟，并在界面处定义了面对面约束。采用考虑应力比和加载历史影响的织物非线性材料模型，描述了聚氨酯在不同拉伸和压缩性能的发泡平面内的本构关系。采用Newton-Raphson增量迭代法求解所涉及的非线性问题。通过与充气膜结构及相应的复合气动模板在水平荷载作用下的荷载-变形响应试验结果对比，验证了所提分析模型的仿真精度。利用数值模型进一步研究了水平大风作用下聚氨酯层厚度对提高大型气动模板整体结构刚度的影响，结果表明聚氨酯层厚度有利于气动模板的形状控制。

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来源期刊

Journal of the International Association for Shell and Spatial Structures ENGINEERING, CIVIL-

CiteScore

1.40

自引率

0.00%

发文量

期刊介绍： The Association publishes an international journal, the Journal of the IASS, four times yearly, in print (ISSN 1028-365X) and on-line (ISSN 1996-9015). The months of publication are March, June, September and December. Occasional extra electronic-only issues are included in the on-line version. From this page you can access one or more issues -- a sample issue if you are not logged into the members-only portion of the site, or the current issue and several back issues if you are logged in as a member. For any issue that you can view, you can download articles as .pdf files.