In this paper, the lateral torsional buckling (LTB) behavior of multi-layered long-span laminated glass (LG) beams is investigated through full-scale model test and numerical simulation. In the test program, the LG beams consisting of up to four glass plies and spanning 5000[Formula: see text]mm are constructed and tested. The load-displacement curves and development of strain in glass plies are recorded, based on which the deformation and stress state of buckled LG beams are analyzed, and the strength checking criterion is provided. The test results are also used to determine the shape and amplitude of initial imperfection through statistical analysis and to validate a numerical model based on the finite element method (FEM). Parametric analysis based on the FEM model is then conducted to investigate influential factors on the LTB resistance of LG beams, among which the influence of shape and amplitude of initial imperfection is emphasized. For the LTB design of LG beams, the applicability of existing formula to determine the critical buckling moment through effective stiffnesses is evaluated for multi-layered LG beams with the test and numerical results. Finally, the design buckling curves adopting the Ayrton–Perry formula (APF) are proposed and validated for LG beams categorized with glass type and load duration.

中文翻译：

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夹层玻璃梁的横向扭转屈曲行为

本文通过全尺寸模型试验和数值模拟研究了多层大跨度夹层玻璃（LG）梁的横向扭转屈曲（LTB）行为。在测试程序中，构建并测试了由多达 4 个玻璃层组成且跨度为 5000[公式：见正文]mm 的 LG 梁。记录了玻璃层的载荷-位移曲线和应变发展，据此分析了屈曲LG梁的变形和应力状态，并提供了强度校核准则。测试结果还用于通过统计分析确定初始缺陷的形状和幅度，并验证基于有限元法 (FEM) 的数值模型。然后基于有限元模型进行参数分析，研究影响LG梁LTB阻力的因素，其中强调了初始缺陷的形状和幅度的影响。对于 LG 梁的 LTB 设计，通过测试和数值结果评估了多层 LG 梁通过有效刚度确定临界屈曲力矩的现有公式的适用性。最后，针对按玻璃类型和荷载持续时间分类的 LG 梁，提出并验证了采用 Ayrton-Perry 公式 (APF) 的设计屈曲曲线。现有公式通过有效刚度确定临界屈曲力矩的适用性通过试验和数值结果对多层 LG 梁进行了评估。最后，针对按玻璃类型和荷载持续时间分类的 LG 梁，提出并验证了采用 Ayrton-Perry 公式 (APF) 的设计屈曲曲线。现有公式通过有效刚度确定临界屈曲力矩的适用性通过试验和数值结果对多层 LG 梁进行了评估。最后，针对按玻璃类型和荷载持续时间分类的 LG 梁，提出并验证了采用 Ayrton-Perry 公式 (APF) 的设计屈曲曲线。