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    時(shí)衛(wèi)民¹   江世永²   付玉輝³

（1 蘭州軍區(qū)司令部工程科研設(shè)計(jì)所 730000； 2 后勤工程學(xué)院 重慶 400016； 3 軍需工業(yè)學(xué)院建筑工程系 邢臺(tái) 054000）

[提要]  根據(jù)磚砌體和混凝土的應(yīng)力-應(yīng)變關(guān)系及極限應(yīng)變值，從理論上推導(dǎo)了后加混凝土與原砌體之間的應(yīng)力-應(yīng)變關(guān)系，提出了新舊材料界限破壞的概念，并按此概念給出了軸心受壓磚砌體采用外包混凝土加固時(shí)混凝土利用系數(shù)的確定方法。
[關(guān)鍵詞]  磚砌體  加固  應(yīng)力-應(yīng)變關(guān)系  混凝土利用系數(shù)

Base on the stress-strain relationship and ultimate strain of hrick masonry and concrete, the stress-straln relationship between later concerete and original brick masonry is deduced.A new concept of boundary fracture of new and old materials is developed. A method of defining concrete utilization coefficient is given in axial compression brick masonry structure strengthened by concrete.
Keywords:  brick masonry structure; strengthened; stress-strain relationship; concrete utilization coefficient