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（1 昆明學(xué)院建筑工程學(xué)院， 昆明 650214； 2 西南交通大學(xué)土木工程學(xué)院， 成都 610031；3 太原理工大學(xué)建筑與土木工程學(xué)院， 太原 030024）

［摘要］為研究套箍加固鋼筋混凝土中長(zhǎng)柱的破壞特征、加固效果和受力性能，開(kāi)展了2根普通鋼筋混凝土中長(zhǎng)柱（軸壓、偏壓各1根）和6根采用套箍加固的鋼筋混凝土中長(zhǎng)柱（軸壓、偏壓各3根）的靜力破壞試驗(yàn)研究。結(jié)果表明：試件主要表現(xiàn)為材料破壞，破壞發(fā)生位置偏向加載端，偏壓柱加固后破壞形態(tài)會(huì)發(fā)生改變；相對(duì)于未加固柱，加固后柱的承載力可以實(shí)現(xiàn)成倍增長(zhǎng)；在加固后的受力過(guò)程中，軸壓構(gòu)件的核心柱和套箍層應(yīng)變變化同步，偏壓構(gòu)件的核心柱相對(duì)于套箍層存在應(yīng)變滯后；加固柱的最終橫向撓曲變形基本符合半波正弦曲線；加固柱的縱向應(yīng)變符合平截面假定。對(duì)試驗(yàn)試件的承載力計(jì)算，《公路橋梁加固設(shè)計(jì)規(guī)范》（JTG/T J22—2008）和《混凝土結(jié)構(gòu)加固設(shè)計(jì)規(guī)范》（GB 50367—2013）的結(jié)果表現(xiàn)存在差異，具體為后者結(jié)果總體表現(xiàn)優(yōu)于前者，前者相對(duì)于后者結(jié)果偏大。

［關(guān)鍵詞］鋼筋混凝土中長(zhǎng)柱；套箍加固；破壞特征；加固效果；受力性能

中圖分類號(hào)：TU375，U445- 7+2文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)10-0111-06

Experimental research on reinforced concrete middle long columns strengthened by jacketing

MAO Dejun1, QIAN Yongjiu2, SONG Shuai3

(1 College of Architecture and Civil Engineering， Kunming University， Kunming 650214， China；2 School of Civil Engineering，Southwest Jiaotong University， Chengdu 610031， China；3 College of Architecture and Civil Engineering，Taiyuan University of Technology， Taiyuan 030024， China)

Abstract:In order to investigate failure characteristic, strengthening effect and mechanical behavior of reinforced concrete middle long columns strengthened by jacketing, the static failure test research of 2 ordinary reinforced concrete middle long columns (1 for axial compression and 1 for eccentric compression) and 6 reinforced concrete middle long columns strengthened by jacketing (3 for axial compression and 3 for eccentric compression) were carried out. The results show that the failure of specimens is mainly manifested as material failure, the location of failure occurs at the loading end, the failure mode of the eccentric compression column will change after reinforcement. Compared with the unreinforced column, the bearing capacity of the strengthened column can be multiplied. During the loading process after reinforcement, the strain of the core column of the axial compression member is synchronous with the jacket; the strain of the core column of the eccentric compression member is lagging behind the jacket; the ultimate transverse flexural deformation of the strengthened column basically conforms to the half-wave sine curve; the longitudinal strain of the strengthened column conforms to the plane section assumption. For the calculation of the bearing capacity of the test specimens, there are differences between the results of Specifications for strengthening design of highway bridges（JTG/T J22—2008）and Code for design of strengthening concrete structure（GB 50367—2013）. Specifically, the overall performance of the latter is better than that of the former, and the former is larger than the latter.

Keywords:reinforced concrete middle long column;strengthened by jacketing;failure characteristic;strengthening effect;mechanical behavior

*云南省地方本科高校基礎(chǔ)研究聯(lián)合專項(xiàng)資金青年項(xiàng)目（2019FH001(-100)），云南省教育廳科學(xué)研究基金項(xiàng)目（2020J0512），國(guó)家自然科學(xué)基金青年科學(xué)基金項(xiàng)目（51808376）。

作者簡(jiǎn)介：毛德均，博士，講師，Email：541089451@qq.com。