局部荷载作用下钢化夹胶玻璃板极限承载力研究

Research on ultimate bearing capacity of laminated tempered glass panel under local load

对四边简支钢化夹胶玻璃板在局部均布荷载作用下的力学性能进行试验研究。以单层钢化玻璃厚度、支承端长度和加载端长度为变量共设置64个试件。测得试件在局部均布荷载作用下的荷载-挠度曲线及板内应力分布情况。随着加载端长度的增加试件破坏模式发生改变,不同破坏模式对应试件的极限荷载区别较大。试件应力分布情况与弹性板受弯时规律基本一致。单层钢化玻璃厚度、加载端长度、支承端长度均与试件极限荷载正相关。支承端长度对极限荷载影响相对较弱,玻璃厚度的影响最强。当厚度在不同范围时,对极限荷载提升作用存在差异,存在极限荷载指标控制下的经济玻璃厚度区间。建立钢化夹胶玻璃板在局部均布荷载作用下的有限元分析模型,给出基于最大应力相等的钢化夹胶玻璃板等效厚度计算公式。

An experiment was carried out to investigate mechanical behaviour of laminated tempered glass panel with two opposite edges simply supported and local uniform load applied.A total of sixty-four specimens with different thickness of single tempered glass layer(T),different bearing length(BL)and different length of loading end(LLE)were tested at a slow speed of monotonic load.The load-deflection curve and stress distribution in plate were measured under local uniform load.With the increase of the length of loading end,the failure mode of the specimens changes,and the ultimate load of the specimens varies greatly with different failure modes.The stress distribution of specimens is basically consistent with that of elastic plates.The thickness of tempered glass,length of loading end and bearing length are all positively correlated with the ultimate load of specimens.Among them,the bearing length has less influence on the ultimate load,but the thickness of glass layer has the most significant influence.For different ranges of the thickness of glass layer,its influence on the enhancing effect of the ultimate load differs to some extent,and there exists the economic thickness range of glass layer under the control index of the ultimate load.The finite element analysis model of laminated tempered glass panel under local uniform load was established,and then the calculation formula of equivalent thickness of laminated tempered glass panel based on the same maximum stress was proposed.