内嵌预应力螺旋肋钢丝加固RC梁承载力分析  

Capacities of RC Beams with Prestressed Near-surface Mounted Helical Rib Steel Wire

作　　者：丁亚红[1] 张春生[1] 曾宪桃[1] 杨小林 

机构地区：[1]河南理工大学土木工程学院,河南焦作454003

出　　处：《兵工学报》2009年第S2期10-14,共5页Acta Armamentarii

基　　金：河南省高校杰出人才创新工程项目(2007KYCX006);河南理工大学博士学位论文创新基金(D2006025);河南省教育厅自然科学研究项目(2009A560006);河南省重点科技攻关项目(092102240009)

摘　　要：在内嵌预应力螺旋肋钢丝加固混凝土梁试验研究基础上,给出了内嵌预应力螺旋肋钢丝抗弯加固混凝土梁消压弯矩、开裂弯矩等特征弯矩的计算公式,分析了预应力螺旋肋钢丝嵌入加固混凝土梁的弯曲破坏类型,推导了内嵌预应力螺旋肋钢丝加固混凝土梁弯曲破坏荷载计算公式,计算结果与试验结果吻合较好。研究结果为该新型技术更好地应用于实际工程提供了依据。The various types of failures were summarized for concrete beams strengthened by near-surface mounted(NSM) prestressed helical rib steel wire based on the experiment.The calculating equations were presented for the characteristic bending moments,such as vanishing pre-compressive stress and cracking moments,of the strengthened beam.All possible strain combinations at ultimate limit state of flexure were analyzed for the composite section.The equations were derived to distinguish between two modes of flexural failure respectively due to fracture of helical rib steel wire and crushing of concrete.A set of equations are suggested for prediction of the corresponding ultimate strength.The applicability of the proposed equations was validated by good agreement of the analytical results with the measured values.

关 键 词：混凝土梁 内嵌加固 螺旋肋钢丝 预应力 弯曲承载力 

分 类 号：TU375.1[建筑科学—结构工程]