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（浙江大學(xué)建筑工程學(xué)院， 杭州 310058）

［摘要］鋼筋混凝土梁的加固中，為了不減小被加固梁底的建筑凈高，在被加固鋼筋混凝土梁的側(cè)面增加扁拱，被加固鋼筋混凝土梁與扁拱間通過(guò)栓釘連接，協(xié)調(diào)受力。根據(jù)變形協(xié)調(diào)，推導(dǎo)了扁拱所分擔(dān)荷載的解析式，給出了栓釘承受剪力的計(jì)算公式。結(jié)合實(shí)際工程，采用ANSYS軟件，數(shù)值解驗(yàn)證了扁拱所分擔(dān)荷載理論解的正確性。進(jìn)一步分析了扁拱形狀、截面剛度參數(shù)改變對(duì)加固效果的影響。結(jié)果顯示，扁拱較直梁加固效果更佳；增大扁拱的曲率和截面抗彎剛度，均能提高加固效果。

［關(guān)鍵詞］扁拱； 加固； 鋼筋混凝土簡(jiǎn)支梁； 栓釘連接； 荷載分配

中圖分類號(hào)： TU375.1    文獻(xiàn)標(biāo)識(shí)碼： A    文章編號(hào)： 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

通訊作者：趙國(guó)興，高級(jí)工程師，Email:13705715669@163.com。