双曲冷弯钢化玻璃板的负向耦合承载性能试验研究

EXPERIMENTAL STUDY ON NEGATIVE COUPLING BEARING CHARACTERISTICS OF DOUBLE-CURVATURE COLD-FORMED SINGLE TEMPERED GLASS PLATES

为研究双曲冷弯单片钢化玻璃板的承载力,对8块两长边框支的单片钢化玻璃板进行冷弯和加载试验,分析冷弯过程中玻璃板内应力分布规律,并通过荷载试验研究冷弯玻璃板的冷弯应力与外荷载负向耦合作用下的承载力。研究结果表明:最大冷弯主拉应力出现在与冷弯角点相邻的短边方向角点区域,并随扭曲率的增加呈线性递增;双曲冷弯玻璃板的承载力随着扭曲率的增加基本呈线性下降趋势,外荷载应力与冷弯应力负向耦合后的最大应力位置随着荷载增加而发生转移。在冷弯玻璃设计中,寻找冷弯应力的最大点和外荷载与冷弯耦合应力的最大点是承载力设计的关键,并应根据冷弯曲率和外荷载的耦合作用来设计玻璃板的厚度。

In order to study the bearing capacity of double-curvature cold-formed single glass,cold forming and loading tests of 8 single tempered glass plates supported by two long frames were carried out,the distribution law of internal stress in glass plate during cold forming was analyzed,the bearing capacity of cold bending glass under the coupling effect of cold-formed stress and negative load was studied through the ultimate bearing capacity test.The test results showed that the maximum cold-formed principal tensile stress increased linearly with the increase of torsional curvature and appears in the corner area of short side which adjacent to the cold forming corner.The bearing capacity decreased linearly with the increase of distortion rate.And the position of maximum stress after the coupling changed with the increase of load.Conclusion could be made that in the design of cold-formed glass,the key of bearing capacity design was to find the maximum point of cold-formed stress and the maximum point of cold-formed coupling stress,the thickness of glass plate should be designed according to the coupling of cold forming rate and external load.