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由于石楼板受弯承载力低且常存在天然裂隙,极易脆断,存在安全隐患,应对其开展加固技术研究。提出采用钢筋网改性砂浆加固石楼板受弯承载力计算方法,开展了5个钢筋网改性砂浆加固石楼板试件和1个未加固的对比试件的受弯性能试验。研究了加固砂浆种类、钢筋类别和配筋率对加固效果的影响。试验结果表明:复合加固石板的破坏类似适筋梁的延性弯曲破坏,而未加固纯石板为突然脆断破坏;加固试件的受弯承载力和弯曲变形能力均有显著提高,且受弯承载力随配筋率和钢筋强度的提高而增大;加固层与原石板界面粘结性能较好,未出现粘结剥离破坏现象。基于试验数据和平截面假定,提出了加固石楼板开裂弯矩和极限弯矩计算公式,计算结果与试验结果吻合较好。
Due to the low flexural bearing capacity of stone slabs and the frequent existence of natural fractures, brittle fracture, there are potential safety problems, and should carry out reinforcement technology research. The calculation method of the flexural bearing capacity of reinforced concrete floor slab with steel mesh modified mortar is proposed and the flexural performance tests of five steel mesh modified mortar reinforced stone floor slabs and one unreinforced reinforced concrete slab are carried out. The effect of reinforced mortar types, reinforcement types and reinforcement ratio on the reinforcement effect was studied. The test results show that the failure of the composite reinforced stone slab is similar to the ductile bending failure of the concrete slab, but the brittleness of the pure stone slab is not only brittle fracture but also the flexural capacity and bending deformation capacity of the reinforced concrete slab are significantly increased, The force increases with the increase of the reinforcement ratio and the strength of the rebar. The interface between the reinforcement layer and the original slab has better adhesion performance, and no peeling of the bond occurs. Based on the test data and the assumption of flat section, the calculation formula of cracking moment and ultimate bending moment of reinforced stone slab is proposed. The calculation results are in good agreement with the experimental results.