Safety Limits for Pre-Tension of Membrane Roofs on Closed Structure in Air Flow
Safety Limits for Pre-Tension of Membrane Roofs on Closed Structure in Air Flow作者机构：School of Civil Engineering Tianjin University Tianjin China Huaheng Construction Group Ningbo China School of Civil Engineering Hebei University of Engineering Handan China
出 版 物：《Applied Mathematics》 (应用数学（英文）)
年 卷 期：2024年第15卷第11期
页 面：818-827页
学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学]
主 题：Membrane Roof Pre-Tension Aerodynamic Stability Critical Wind Speed
摘 要：The stiffness required for the normal operation of membrane roof comes from the application of pre-tension. When the pre-tension is too small, it is easy to cause instability under the action of wind load, which leads to excessive deformation of the roof and local or overall damage. In order to ensure that the membrane roof is always in normal use state in the airflow field, this paper takes the membrane pretension as the control parameter to study the value of safety pretension of closed membrane roof. According to the theory of large deflection of membrane and Galerkin method, the nonlinear vibration differential equation of membrane roof under static wind is established, and the critical state of safe working of membrane roof is determined by judging the stability of the solution of the equation, and the expression of critical wind speed is obtained. By establishing the inequality relationship between local design wind speed and critical wind speed, the safety pretension limit of membrane roof under specific site can be obtained. The research shows that the safety pretension limits of closed membrane roofs are different in different areas under different design return periods. In addition, the value of safety pretension is related to the film geometry.
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