时卫民¹   江世永²   付玉辉³

（1 兰州军区司令部工程科研设计所 730000； 2 后勤工程学院 重庆 400016； 3 军需工业学院建筑工程系 邢台 054000）

[提要]  根据砖砌体和混凝土的应力-应变关系及极限应变值，从理论上推导了后加混凝土与原砌体之间的应力-应变关系，提出了新旧材料界限破坏的概念，并按此概念给出了轴心受压砖砌体采用外包混凝土加固时混凝土利用系数的确定方法。
[关键词]  砖砌体  加固  应力-应变关系  混凝土利用系数

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