【摘要】 以佛山市世纪莲体育中心大跨度轮辐式张拉索膜结构为研究对象,采用ANSYS程序建立有限元模型,分析其动力特性,并用振型分解反应谱法计算地震作用下结构的受力性能。研究结果表明:结构自振频率较低,频谱集中,频率跳跃现象不明显;结构以屋盖的竖向振动为主,具有较好的抗侧刚度和抗扭刚度;反应谱分析时,为保证各方向的模态质量参与系数在90%以上,建议其振型取140阶以上;地震作用对结构上压环、下压环及腹杆的内力影响较大,必须参与荷载组合;不同方向地震作用下,结构内力及位移存在显著差别,应同时考虑一维及多维地震作用的影响。更多还原

【Abstract】 Using the program ANSYS,finite element model of the rung-shape long-span tensile cable-membrane structure in Foshan Century Lotus Stadium was conducted to investigate its dynamic characteristics and its mechanical performance under seismic loading.Study results indicate that the natural frequencies of the structure are all lower and frequency spectrums concentrate in a small range,and the frequency jumping phenomenon isn’t in evidence.The structure’s vibration is mainly vertical vibration,and its lateral stiffness and torsion rigidity are well.To ensure that the modal mass participating coefficient is more than 90%,the contributions of the former 140 modes should be considered when the analysis of response spectrum is done.Because the seismic loading can greatly influence the internal force of the upper compression ring,the lower compression ring,and the truss web,it should be calculated in the load combination.When the seismic loading on the structure is from different directions,the internal force and displacement of the structure have significant difference.So the effects of the different directions of the waves and their combinations should be considered together.更多还原