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 (中國(guó)建筑科學(xué)研究院建筑結(jié)構(gòu)研究所， 北京 100013)

［摘要］針對(duì)結(jié)構(gòu)工程中常見(jiàn)框架柱混凝土強(qiáng)度不足的缺陷，提出了用高強(qiáng)材料置換柱外周截面的加固方法，并對(duì)實(shí)施工藝與補(bǔ)強(qiáng)效果進(jìn)行了試驗(yàn)研究。多個(gè)混凝土軸壓、偏壓柱試件的破壞試驗(yàn)表明，該方法可明顯提高柱的受壓與受剪承載力，且得到以下結(jié)論：被加固低強(qiáng)混凝土柱的受壓與受剪承載力隨其組合截面折算平均強(qiáng)度的增加而增大；置換外周截面加固柱的延性無(wú)明顯變化；被加固柱的設(shè)計(jì)承載力可根據(jù)《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》（GB 50010—2010）中相應(yīng)方法計(jì)算確定；《混凝土結(jié)構(gòu)加固設(shè)計(jì)規(guī)范》（GB 50367—2006）中關(guān)于置換截面加固的混凝土強(qiáng)度限制條件應(yīng)適當(dāng)放松。研究表明，該方法適用于加固僅混凝土強(qiáng)度明顯低于設(shè)計(jì)與使用要求，或中、輕度地震損壞（配筋未屈服）的框架柱。當(dāng)這些柱位于多層結(jié)構(gòu)下部時(shí)，如采用該加固方法，絕大多數(shù)情況下可避免連帶拆除質(zhì)量合格的上部結(jié)構(gòu)。

［關(guān)鍵詞］高強(qiáng)材料; 置換外周截面加固混凝土柱; 組合截面折算平均強(qiáng)度; 軸壓與偏壓; 變形協(xié)調(diào); 延性

中圖分類號(hào)：TU375.3        文獻(xiàn)標(biāo)識(shí)碼：A        文章編號(hào)：1002-848X(2014)11-0001-07

Experimental research on reinforced concrete columns strengthened by replacing peripheral section with high-strength material

Pan Li

（Institute of Building Structures, China Academy of Building Research, Beijing 100013, China） 

Abstract: Considering the inefficient concrete strength of the frame columns in structural engineering, the new strengthening method was proposed by replacing peripheral section with high-strength material. Operation process and strengthening effects of the method were studied in tests. Destructive tests of column specimens in axial compression and eccentric compression show that, by replacing peripheral section with high-strength material, the compression and shear strength increase significantly, and conclusions are obtained that compression and shear strength of specimens increase with increment of average conversion strength of the composite section. The specimen ductility is nearly unchanged. Specimen bearing capacities can be determined according to Code for design of concrete structures (GB 50010—2010), and relative restrictions about concrete strength of replaced section strengthening method in Design code for strengthening concrete structure（GB 50367—2006）should be released appropriately. Study shows that the strengthening method is suitable to use for columns with inefficient concrete strength, or non-seriously damaged frame columns in earthquake (i.e. no yielded reinforcements). Especially, when the kind of defective columns are located in lower parts of a multi-story building, by using  strengthening method, the qualified upper structure can be avoided to be removed and rebuilt in most cases.

Keywords: high-strength material; reinforced concrete columns strengthened by replaceing  peripheral section; average conversion strength of the compound section; axial and eccentric compression; coordinate deformation; ductility

作者簡(jiǎn)介：潘立，碩士，教授級(jí)高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email: panli535482@sohu.com, panlicabr@163.com。

參考文獻(xiàn)

［1］GB 50376—2006混凝土結(jié)構(gòu)加固設(shè)計(jì)規(guī)范［S］.北京：中國(guó)建筑工業(yè)出版社，2006.

［2］GB 50011—2010 建筑抗震設(shè)計(jì)規(guī)范［S］．北京：中國(guó)建筑工業(yè)出版社，2010.

［3］GB/T 50448—2008水泥基灌漿材料應(yīng)用技術(shù)規(guī)范［S］. 北京：中國(guó)計(jì)劃出版社，2008.

［4］GB 50010—2010 混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范［S］．北京：中國(guó)建筑工業(yè)出版社，2011.

［5］潘立，孫巧珍，劉暢. 高強(qiáng)材料置換混凝土柱、墻外周截面加固方法的研究［R］. 北京：中國(guó)建筑科學(xué)研究院建筑結(jié)構(gòu)研究所，2011.

［6］黃小坤，朱愛(ài)萍，孔慧. 復(fù)合受力鋼筋混凝土構(gòu)件承載力的協(xié)調(diào)計(jì)算模式［R］.北京：中國(guó)建筑科學(xué)研究院建筑結(jié)構(gòu)研究所，2009.

［7］JGJ 101—96建筑抗震試驗(yàn)方法規(guī)程［S］.北京：中國(guó)建筑工業(yè)出版社，1997.

［8］孫巧珍，劉暢，翟彬. 高強(qiáng)材料置換截面加固混凝土框架柱的抗震性能試驗(yàn)研究［J］. 建筑科學(xué)，2011，27(1)：61-64.