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    韓繼云  曲京輝  萬墨林  孫夢(mèng)蘭  翟傳明
    （中國建筑科學(xué)研究院結(jié)構(gòu)所  北京 100013）

[提要]  介紹閉合托架技術(shù)在建筑結(jié)構(gòu)改造中的應(yīng)用實(shí)例，閉合托架利用了原有基礎(chǔ)，不需增設(shè)新的柱基礎(chǔ)。托架梁為鋼骨混凝土和預(yù)應(yīng)力混凝土與原磚墻組成的組合梁，利用預(yù)應(yīng)力技術(shù)可起到加固與卸荷合二為一的作用，使后加結(jié)構(gòu)主動(dòng)參與受力，改變了原有結(jié)構(gòu)應(yīng)力過大、后加部分應(yīng)力滯后的現(xiàn)象。
[關(guān)鍵詞]  托換改造  閉合托架  組合梁  預(yù)應(yīng)力卸荷

 An application example of closed bracket to demolish bearing wall is introduced, which uses the old base. The supporting beam is a composite beam that is composed by steel framed reinforced concrete, prestressed concrete and existing brick wall. The prestress technique can help strengthening and unloading work together, and let the new structure bear load actively, and change the phenomenon that the stress of old structure is too much and the partial stress of the new structure lags.
Keywords:  supporting beams; closed bracket; composite beam; prestress; unload