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中文摘要：
将不同模量管材包裹下的轴压混凝土圆柱构件内部混凝土看作由骨料、砂浆骨料过渡层、砂浆组成的三相复合材料,利用骨料随机投放程序确定骨料在试件中的随机位置,并考虑各相材料的弹塑性性质,建立了构件的三维非线性细观分析模型.通过对不同模量管材（PE,HDPE,PVC,钢）包裹下的轴压混凝土圆柱的内部细观力学性能进行分析,探讨不同材料外包下轴压混凝土柱破坏的开展与其内部各种材料（如骨料、过渡层、砂浆等）及外部包裹材料的细观受力状况的关系.
英文摘要：
The 3-D nonlinear meso-mechanics of the concrete column wrapped with tubular material is numerically studied in this paper, including tube of variable elasticity modulus, with the concrete as a type of three-phase composite material composed of mortar matrix, aggregates and bonds connecting the matrix and aggregates. In the numerical model, the random coordinates of the aggregates are determined by a program. With the results, we discuss the relationship between the failure characteristics of the concrete column wrapped with different materials （PE, HDEP, PVC, Steel etc.） and the meso-mechanics of the different interior materials （mortar matrix, aggregates and bonds connecting the matrix and aggregates）.
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