板缝嵌埋CFRP筋的组合石板受弯性能试验研究

Experimental study of the flexural behavior of stone slabs reinforced with CFRP bars in the joints

在相邻条石板板缝间嵌埋CFRP筋并填入高强粘结材料,形成了一种新型的组合石板构件。开展了包含三板两缝的组合石板的受弯性能试验,研究了试件的破坏形态、受弯承载力、变形性能、石材及CFRP筋应变分布。试验结果表明,开裂前各条石板与CFRP筋及嵌缝材料变形一致,协同工作性能良好;达到开裂弯矩后,各条石板在跨中同一位置逐次开裂;开裂后由CFRP筋和嵌缝材料组成的增强带有效防止了石板的塌落。基于试验结果,分析了组合石板开裂前后的不同受力机制。研究成果可为新型组合石板的进一步研究及既有石板楼盖的鉴定加固提供参考。

A new technique of reinforcing multi stone slabs with CFRP bars in the joints was proposed in this paper. The flexural behavior of this innovative stone member was explored by testing a specimen with three slabs and two joints, in which the joints were mounted with CFRP bars using high-strength bond material. The failure mode, flexural bearing capacity, deformation capacity and strain distribution of the stone and the CFRP bars were studied. Test results show that： （ 1 ） before cracking occurred, the slabs, CFRP bars and joint-filling material deform uniformly; （2） when the cracking moment is reached, stone slabs rupture gradually near the mid-span; and （3） CFRP bars as well as the joint-filling material play a significant role in preventing the abrupt collapse of stone slabs after cracking occurred. Different moment-resistance mechanisms of the specimen before and after cracking were analyzed based on test results. The investigation conducted in this paper could give a reference to further research on reinforced stone slabs and evaluation and strengthening of existing stone floor slabs.