钢筋网改性砂浆加固石楼板受弯性能试验研究  

Experimental study on flexural behavior of stone slabs strengthened with ferrocement mortar

作　　者：郭子雄[1] 王兰[1] 柴振岭[1] 刘阳[1] 李钢[2] 伊廷华[2] 

机构地区：[1]华侨大学土木工程学院,福建泉州362021 [2]大连理工大学建设工程学部,辽宁大连116024

出　　处：《建筑结构学报》2011年第3期69-74,共6页Journal of Building Structures

基　　金：国家自然科学基金项目(50978107;51006133);国家"十一五"科技支撑计划项目(2006BAJ06B03);教育部新世纪优秀人才支持计划项目(NCET-06-0571);厦门市科技计划项目(3502Z20093029);华侨大学基本科研业务费专项基金项目(JB-JC1007)

摘　　要：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。Stone slabs have been widely used as floor slabs and stairs in stone masonry buildings in southeast of China.It is significant to study the strengthening technology for stone slab to enhance its deformation ductility and avoid sudden rupture.Five full-scale stone slabs strengthened with ferrocement mortar and one unreinforced stone slab were tested under monotonic loading to investigate the effects of mortar type,reinforcement type and reinforcement ratio on the flexural behavior of specimens.Test results indicate that the failure mode of strengthened specimens is similar to the ductile flexural failure of RC beam while the unreinforced stone slab showed brittle failure in rupture.The flexural strength and deformation capacity of strengthened specimens are largely enhanced,and the flexural strength is increased along with the increase of reinforcement ratio.Test results show good interface bond behavior between stone slabs and reinforcement layer.No debonding failure is observed.Based on the test results and the plane section assumption,an analytical model is proposed to calculate the cracking moment and ultimate moment capacity of strengthened stone slabs.The proposed model shows excellent agreement with the experimental results,and can be referenced for engineering application.

关 键 词：石结构 石楼板 钢筋网-改性砂浆 加固 静力试验 受弯承载力 

分 类 号：TU363[建筑科学—结构工程] TU317.1