（武汉理工大学工程结构与力学系，武汉 430070）
［摘要］钢筋混凝土薄腹梁体外预应力下撑式钢拉杆加固中，测量张拉高度v不易实现。利用张拉高度与钢拉杆的几何关系，将张拉高度转换为钢拉杆轴向应变和薄腹梁跨中竖向位移，在加固施工时对应变和位移双重监控，效果良好，对同类结构加固有参考价值。
［关键词］薄腹梁；预应力加固；拉应力；反拱；监控
Monitoring the strengthened effect of thin web RC beams with external prestressing
Yi Xianren（Department of Engineering Mechanics, Wuhan University of Technology, Wuhan 430070,China）
Abstract:When the-reinforced concrete thin-web beams are strengthened by prestressed-steel bar, tensile heights are difficult to be measured. Based on the geometry relationships between tensile steel bar and tensile height, the stress of tensile steel bar and the vertical displacement of thin web beams on their mid-span can be derived from the tensile height. Thus the monitoring of stress and strain is achieved during strengthening construction, and the monitoring effects are very well, which provide better reference-for the same kind of structures.
Keywords:thin web beam; prestress strengthening; tensile stress; reverse deflection; monitoring
作者简介：易贤仁，副教授，Email:yixr1952@sina.com。
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