This paper investigates the structural response of laminated glass beams under combined fire-exposure and sustained in-plane loading. This is done by means of experimental testing and Finite Element (FE) numerical modelling. Firstly, small-scale (1 m long) laminated glass beams are tested under thermal exposure and in-plane loading on a small fire resistance test furnace. From the test results it can be seen that laminated glass beams are able to sustain an imposed in-plane load for a time of 34–51 min before failing according to the limiting rate of deflection as defined in EN 1363–1:2012. It should be noted, however, that the observed failure times are strictly related to the boundary conditions applied in the test, i.e. the magnitude of mechanical loads (in this study a relatively small load of P = 1.15 kN was applied) and the presence of an inherent top zone protection, which may have positively affected the results. Secondly, additional FE thermo-mechanical simulations are performed to further investigate the mechanical response of the laminated glass beams under thermal exposure, with a focus on the effects of the top zone protection and the load magnitude on the performance of the examined laminated glass beams. From the FE study it can be seen that reducing the top zone protection (from 40 mm to 0 mm) results in a reduction in failure time from 45 min to 20 min, while increasing the load with a factor 5 (taking 30 mm top zone protection as a reference) results in a reduction of failure time from 32 to 18 min.

本文研究了组合式玻璃梁在暴露于火灾和持续面内载荷作用下的结构响应。这是通过实验测试和有限元（FE）数值建模来完成的。首先，在小型耐火试验炉上在热暴露和面内载荷下测试小尺寸（长1 m）的夹层玻璃梁。从测试结果可以看出，按照EN 1363-1：2012定义的极限挠曲率，夹层玻璃梁在承受34-51分钟的平面载荷之前会失效。但是，应该指出的是，观察到的失效时间与测试中所采用的边界条件严格相关，即机械载荷的大小（在本研究中，相对较小的载荷为P  = 1.15 kN）和固有的顶部区域保护的存在，这可能会对结果产生积极影响。其次，进行了额外的有限元热力学模拟，以进一步研究夹层玻璃梁在热暴露下的机械响应，重点是顶部区域保护的影响以及负载量对所检查的夹层玻璃梁的性能的影响。从有限元研究中可以看出，减少顶部区域保护（从40 mm到0 mm）可将故障时间从45分钟减少到20分钟，同时将负荷增加5倍（采用30 mm顶部区域）保护作为参考）可以将故障时间从32分钟减少到18分钟。