多层夹层玻璃柱轴压设计方法研究

Study on design method of multi-layer laminated glass columns under axial compression

以夹层玻璃作为承重构件的玻璃结构在景观建筑结构中的应用日益广泛。夹层玻璃柱在轴压荷载作用下易发生绕弱轴弯曲屈曲。对于由3片及以上玻璃组成的多层夹层玻璃柱的弯曲屈曲行为,目前尚无成熟的设计方法。基于考虑玻璃板间滑移效应的组合梁模型,推导了多层夹层玻璃柱在轴压荷载作用下的屈曲临界荷载计算方法和强度校核准则,并提出了适用于工程设计的简化计算公式和柱稳定系数-长细比(φ-λ)曲线。通过与已有文献数据比对,对所提出的屈曲临界荷载、极限荷载计算式及φ-λ曲线进行了验证。结果表明,所提出的计算式对于多层夹层玻璃柱的屈曲临界荷载和极限荷载计算精度较高,φ-λ曲线能保证构件的安全性。

Structures adopting laminated glass(LG) as load carrying members are increasingly used in aesthetic demanding buildings nowadays. LG columns are vulnerable to out-of-plane flexural buckling under axial compression. However, a complete design method applicable to the flexural buckling behavior of LG columns composed of three or more glass panes is still unavailable. Based on the model of composite beams that takes into account the sliding effect between glass panes, a calculation method that gives the critical buckling load and the strength check criteria for the multi-layer LG columns under axial load were deduced in this paper, and the simplified formulae and the stability factor-slenderness ratio(φ-λ) buckling curve suitable for engineering design practice were proposed. The proposed formulae and the φ-λ buckling curve were verified by correlated data collected from published literatures. The results of verification show that the proposed analytical formulae for the critical buckling load and the ultimate strength of multi-layer LG columns are of high accuracy, and the proposed design φ-λ curve can ensure the safety of the components.