According to fracture characteristic of concrete beams, the influence of main factors such as size effect, concrete strength and relative crack length on fracture toughness is discussed.

针对混凝土材料断裂的特点，探讨了影响断裂韧度的主要因素：尺寸效应、混凝土强度和相对缝深等。

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The concrete with high properties has the characteristic of high strength, stiffness, elastic modulus and durability.

高性能混凝土具有高强度、刚度、弹性模量和耐久性。

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We carry out experiment and research to U section steel-early-strength concrete beams in residence building, analyze the forcing, deformation characteristic and destruction mechanism.

对住宅建筑中U型钢-早强混凝土组合梁进行了试验研究，根据实验结果分析其受力、变形特征和破坏机理。

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