重屋盖走廊点支式玻璃建筑柔性支承结构的地震反应分析

近年来随着点支式玻璃帷幕结构的广泛应用,各种新型的支承结构孕育而生,但对于结构性能的研究往往滞后于实际工程,开展新型结构的研究显得尤为重要。某重屋盖柔性支承结构点支式玻璃走廊即为将刚性梁和柔性索(包括揽风索、悬索和立面的竖索)相结合的一种新型结构形式,本文通过对该工程实例的分析计算,得出了结构的自振特性,并采用振型反应谱分析法研究了某些索内预应力的变化对结构变形和其它索内力的影响,计算结构表明,拿掉揽风索会导致屋盖平面外刚度减小,结构第二振型改变也较大。揽风索预应力的变化对结构自振特性、自身及悬索内力的影响并不显著,但对结构刚度和竖索内力的影响相对较大。而竖索预应力变化对其它索内力、结构高频自振性能及最大位移影响较大。本文结果可以为今后类似结构的研究提供参考。

Seismic Response Analysis on Point-supported Glass Corridor with Heavy Roof and Flexible Supporting System

With the wide application of point-supporting glass facades in recent years,varieties of new styles of supporting systems have emerged,but the researches on these structures always lag far behind its engineering practice,therefore it is urgent to make intensive researches on these structures.Normally glass corridors are assembled with rigid beams.A new type of flexible supporting system consisting of wind-resistance cable,suspended cable on roof and vertical cable is introduced in this paper,and its dynamic performance is analyzed.The influence of pretension in some cables to the deformation and the internal forces in other cables are also studied by the means of seismic response spectrum.It is shown that the out-of-plane stiffness of the roof decreases sharply,and the second vibration mode also changes greatly,when the wind-resistance cables are removed.The pretension of wind-resistance cables have little effects on the internal force of themselves and suspended cables,dynamic vibration characteristics of global structure,while they have relatively greater impacts on the internal force of vertical cables and the stiffness of global structure.The pretension in vertical cables has significant effects on internal forces,dynamic vibration characteristics of higher frequency and maximun displacement of the structure.The information presented in this paper provides a reference for future similar structures.