不同索网加劲的气承式膜结构受力特性研究

气承式膜结构是典型的柔性结构，具有较强的非线性，通过铺设索网以保证其具有足够的刚度和稳定性。本文首先通过缩尺试验对设有不同索网的气承式膜结构进行不同内压下的试验研究，得到了内压的变化对索力值大小的影响和变化规律；其次，采用Ansys软件建立与试验相同的模型，结果对比分析验证了数值模拟方法的准确性；最后，建立实际工程模型，研究了不同内压和矢跨比条件下结构膜面位移和应力分布，确定结构存在合理的矢跨比，并进行了两种索网布置下结构在不同内压下最大应力和位移的对比分析。研究表明，斜交索网有效约束了结构的位移并改善了膜面的受力性能，该结果能为今后相关的工程设计提供参考依据。

Study on the force characteristics of air-supported membrane structure with different cable network reinforcement

An air-supported membrane structure is a typical flexible structure with strong nonlinearity,which is ensured with sufficient stiffness and stability by laying a cable network.In this paper,firstly,we conducted experimental research on air-supported membrane structures with different cable nets under different internal pressures through scaled-down tests,and analyzed the influence of the internal pressure on the magnitude of the cable force;Secondly,we established the same model as the tested structure through Ansys software,and verified the accuracy of the numerical simulation method by comparing and analyzing the results;Finally,we established an actual engineering model to study the displacement and stress distribution of the membrane surface under different internal pressures and height-to-span ratios to determine a reasonable height-to-span ratio of the structure,and to conduct a comparative analysis of the maximum stress and displacement of the structure under different internal pressures under two cable network arrangements.The results show that the diagonal cable network effectively restricts the displacement of the structure and improves the stress performance of the membrane surface,which can provide a reference basis for future engineering design.