[提要]  通过8根混凝土内含角钢骨架梁的试验，研究了加荷全过程截面的应变变化规律。根据对构件变形实测数据的统计分析，得到延性系数的一般计算公式。
[关键词]  混凝土  角钢骨架  梁  裂缝  应变  协调系数  延性

According to the test of 8 angle steel skeleton encased concrete beams, the varied regular of strain across section during loading is studied, and the formula for calculating ductility factor is put forward in terms of the statistic analysis of the experimental data.
Keywords: angle steel skeleton; concrete beam; crack; strain; coordinate factor; ductility