伞形张拉膜结构在冰雹冲击作用下的动力响应研究

Dynamic responses of umbrella shaped tension membrane structures under the impact of hail

以工程中常用的伞形张拉膜结构为研究对象,研究其在冰雹冲击作用下的动力响应问题。设计制作各种试验装置,通过对伞形膜结构的冰雹冲击试验,得到了冰雹冲击伞形膜结构不同测点的位移、速度以及边索的张拉松弛率。通过有限元软件ANSYS/LS-DYNA模拟冰雹对伞形膜结构的冲击,并与试验数据对比分析,验证试验的可靠性与准确性。结果表明,冰雹冲击会造成伞形膜结构产生大变形,并加速应力松弛,甚至导致膜面撕裂破坏。该结果为研究群冰雹冲击动力响应打下基础,也为张拉膜结构的设计、施工和维护提出工程参考依据。

Taking an umbrella-shaped tension membrane structure commonly used in engineering as the research object,its dynamic response under hail impact was studied.Various test devices were designed and made.Through the hail impact test of the umbrella-shaped membrane structure,the displacement and velocity at different measuring points and the tension relaxation rate of the side cables were obtained.Then the finite element software ANSYS/LS-DYNA was used to simulate the impact of hail on the umbrella-shaped membrane structure,and the results were compared with the experimental data to verify the reliability and accuracy of the test.The final results show that the hail impact will cause large deformation of the umbrella-shaped membrane structure,accelerate stress relaxation,and even lead to membrane surface tearing and damage.The results lay a foundation for the study of the dynamic response of group hail impact,and also provide an engineering reference for the design,construction and maintenance of tensioned membrane structures.