摘要
为研究四点支承玻璃板在循环荷载作用下的力学性能,对采用浮头式驳接头点支承的8块钢化玻璃板和15块夹胶玻璃板进行了板中心集中力加载疲劳破坏试验,并观测了循环荷载作用下玻璃板中心点的挠度和关键点的动静态应力变化.试验表明:钢化玻璃在循环荷载作用下的循环荷载-板中心挠度曲线呈弱非线性,随着荷载循环次数的增加其抗弯刚度没有明显变化;夹胶玻璃在循环作用下的荷载-板中心挠度曲线与试验环境温度有关,在温度低于15℃时无滞回环,而温度在22～30℃范围内时,则有明显的滞回环;夹胶玻璃的等幅循环加载荷载-板中心挠度曲线在循环初期挠度随着循环次数的增加而逐渐增大,但循环次数超过5×104后,板中心挠度几乎不随循环次数的增加而变化.点支式钢化玻璃和夹胶玻璃经过5×105次循环加载后,卸载至零,再进行静载破坏试验,其静载抗弯承载力没有降低,表明钢化玻璃和夹胶玻璃抗疲劳性能很好.
In order to study the mechanical properties of four-point-supported glass panel under cyclic loading,fatigue tests were carried out on 8 tempered glass panels and 15 laminated glass panels under cyclic concentrated force.The deflections and the stresses at the key points during the loading process were measured.Experiments show that the load-center deflections of point-supported tempered glass panels slightly non-linearly rise with increasing cyclic loading,and the bending stiffness of tempered glass panels does not change with the increase of cyclic number.The load-center deflection curves of the laminates under dynamic load are related to ambient temperature.There is no hysteresis loop occurs at ambient temperature below 15 ℃,while pronounced hysteresis loop at occurs 22 to 30 ℃.The load-center deflections of laminated glass panels under a constant amplitude cyclic loading grow with the increase of cycles,but the increment of deflections are reduced gradually and after 5×104 cyclic loadings these is almost no more increment of deflection.Both tempered glass and laminated glass panels after the fatigue tests show no static flexural strength reduction after 5×105 cyclic loadings.The results indicate that point-supported tempered glass and laminated glass panels both have good fatigue capacity.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第4期706-712,共7页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(50578041)
关键词
点支式
钢化玻璃板
夹胶玻璃板
循环疲劳
承载性能
试验
point-supported
tempered glass panels
laminated glass panels
cyclic fatigue
carrying capacity
testing
