- 摘 要
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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)了扁拱所分擔荷載的解析式，給出了栓釘承受剪力的計算公式。結(jié)合實際工程，采用ANSYS軟件，數(shù)值解驗證了扁拱所分擔荷載理論解的正確性。進一步分析了扁拱形狀、截面剛度參數(shù)改變對加固效果的影響。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； 鋼筋混凝土簡支梁； 栓釘連接； 荷載分配
中圖分類號： TU375.1 文獻標識碼： A 文章編號： 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：趙國興，高級工程師，Email:13705715669@163.com。
