Abstract The cable-net supported facade is increasingly used in the modern buildings. In a cable-net facade, the ends of the cables are anchored to the primary structure along its elevation, and the facade’s seismic response is triggered by the earthquake-induced vibration of the primary structure. In this regard, the effect of the primary structure should be considered in the seismic response analysis of the cable-net facades. However, such an effect is ignored in most of the preceding research. In this paper, the effect of the primary structure on the seismic response of the cable-net facade is quantitatively studied. A group of cable-net models is subjected to two types of earthquake excitations. First, the ground accelerations are uniformly applied to the cable-net models. In this case, the effect of the primary structure is neglected. Second, the ground accelerations are applied to a series of primary structural models, generating the height-wise non-uniform dynamic excitations for the cable-nets, and the cable-nets are subjected to the non-uniform excitations. In this case, the effect of the primary structure is fully accounted for. A detailed comparison between the two groups of results is conducted. It is shown that the primary structure significantly influences the peak response of the cable-net facade, and such influences are strongly affected by the fundamental period ratio (RT) between the cable-net and the primary structure. For RT ≤ 0.6, it would be overly conservative to neglect the effect of the primary structure, while for RT ≥ 0.8 (especially at RT ≥ 1.0), it is unsafe to neglect such effects. If RT is around 1.0, the mid-span displacement of the cable-net facade under the non-uniform excitation (considering the effect of the primary structure) could be twice as large as that under the uniform excitation. Meanwhile, the tension of cables could exhibit a 20% increase due to the effect of the primary structure. The results obtained from different types of primary structures (varied lateral force resisting mechanism) are similar. From this study, it is inappropriate to ignore the effect of the primary structure in analyzing the seismic responses of the cable-net facades. This indicates the drawback of many preceding studies wherein the effect of the primary structure is neglected, and shows the necessity of developing a proper approach to account for this effect in the design of the cable-net facades.

中文翻译：

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主要结构对索网幕墙地震反应的影响

摘要 索网支撑立面越来越多地应用于现代建筑中。在索网立面中，缆索的末端沿其立面锚固在主要结构上，立面的地震响应由主要结构的地震引起的振动触发。对此，索网立面的地震反应分析应考虑主要结构的影响。然而，在大多数先前的研究中，这种影响被忽略了。本文定量研究了主要结构对索网立面地震反应的影响。一组索网模型受到两种地震激励。首先，地面加速度均匀地应用于索网模型。在这种情况下，初级结构的影响被忽略了。第二，地面加速度应用于一系列主要结构模型，为索网产生高度方向的非均匀动力激励，索网受到非均匀激励。在这种情况下，主要结构的影响得到了充分考虑。对两组结果进行了详细比较。结果表明，主结构显着影响索网立面的峰值响应，并且这种影响受索网与主结构之间的基本周期比（RT）的强烈影响。对于 RT ≤ 0.6，忽略一级结构的影响过于保守，而对于 RT ≥ 0.8（尤其是 RT ≥ 1.0），忽略此类影响是不安全的。如果 RT 在 1.0 左右，索网立面在非均匀激励下的跨中位移（考虑主结构的影响）可能是​​均匀激励下的两倍。同时，由于主要结构的影响，缆索的张力可能会增加 20%。从不同类型的主要结构（不同的侧向力抵抗机制）获得的结果是相似的。从这项研究来看，在分析索网立面的地震反应时忽略主要结构的影响是不合适的。这表明了许多先前研究的缺陷，其中忽略了主要结构的影响，并表明有必要开发一种适当的方法来解决电缆网立面设计中的这种影响。