（浙江大学建筑工程学院， 杭州 310058）

［摘要］钢筋混凝土梁的加固中，为了不减小被加固梁底的建筑净高，在被加固钢筋混凝土梁的侧面增加扁拱，被加固钢筋混凝土梁与扁拱间通过栓钉连接，协调受力。根据变形协调，推导了扁拱所分担荷载的解析式，给出了栓钉承受剪力的计算公式。结合实际工程，采用ANSYS软件，数值解验证了扁拱所分担荷载理论解的正确性。进一步分析了扁拱形状、截面刚度参数改变对加固效果的影响。结果显示，扁拱较直梁加固效果更佳；增大扁拱的曲率和截面抗弯刚度，均能提高加固效果。

［关键词］扁拱； 加固； 钢筋混凝土简支梁； 栓钉连接； 荷载分配

中图分类号： TU375.1    文献标识码： A    文章编号： 1002-848X(2015)S2-0406-06

Analytic solution of distributed load allotted to flat-arch for simply supported

 reinforced concrete beam strengthening

Xiao Nan, Hang Shixuan, Zhao Guoxing

(College of Civil Engineering & Architecture, Zhejiang University, Hangzhou 310058, China)

 Abstract: In order not to decrease the room space height beneath the damaged Reinforced Concrete (RC) beams in the process of beams strengthening, flat-arches were employed to attach at both sides of the damaged RC beam via bolts embedded through the flat-arches into the RC beam. Based on the compatibility of deformation between damaged RC beam and flat-arches, the analytic solution of distributed load allotted to flat-arch was deduced, and, the formulae of shear forces in bolts were proposed. A practical case was investigated by both the proposed solution and finite element numerical method of ANSYS software; the proposed analytic solutions in the paper were validated. Furthermore, parameters analyses such as the rise of arch and sectional bending stiffness variations in flat-arches were conducted to estimate effectiveness of strengthening. The results show that flat-arches employed for the damaged RC beam strengthening have greater effectiveness than the regular straight beams used, and increase in either the rise of flat-arch or the sectional bending stiffness of flat-arch will enhance the effectiveness of strengthening.

Keywords: flat-arch; strengthening; reinforced concrete simply supported beam; bolt connection; load allocation

通讯作者：赵国兴，高级工程师，Email:13705715669@163.com。