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北京新保利大厦玻璃幕墙支承结构采用单层索网支承体系,立面呈倒L形,轮廓尺寸57.6m宽×87.7m高,是目前国内建造的同类幕墙结构中跨度最大的一座。采用基于随机振动理论的非线性有限元方法,对该幕墙索支承结构的抗震性能进行了深入分析。采用非线性时程分析方法对结构在常遇地震和罕遇地震作用下的动力响应进行分析,从而对结构的抗震性能做出评价;通过对不同边界条件下的计算结果进行对比,探讨了主体结构刚度对幕墙振动性能的影响;在上述工作的基础上,对单索幕墙抗震设计的某些基本原则进行了初步探讨。计算结果表明,单层平面索网幕墙结构具有良好的抗震性能;在进行抗震分析时,应注意其与传统刚性结构在力学性能上的差异。
Beijing Poly Plaza, glass curtain wall support structure using single-layer cable network support system, inverted L-shaped facade, the outline size of 57.6m wide × 87.7m high, is currently the construction of similar curtain wall structure of the largest span. The nonlinear finite element method based on stochastic vibration theory is used to analyze the seismic performance of the cable supporting structure. Nonlinear time-history analysis method is used to analyze the dynamic response of the structure under frequently encountered earthquakes and rare earthquakes so as to evaluate the seismic performance of the structure. By comparing the calculated results under different boundary conditions, the main body The influence of structural stiffness on the vibration performance of curtain wall is discussed. Based on the above work, some basic principles of seismic design of single cable curtain wall are preliminarily discussed. The calculation results show that the single-layer plane cable net curtain wall structure has good anti-seismic performance. At the time of anti-seismic analysis, attention should be paid to its difference in mechanical properties compared with the traditional rigid structure.