【摘要】 通过试验 ,应用断裂力学分析 ,考虑混凝土内部裂缝的起裂和扩展机理 ,能够确定出抗折试件在短期加载下[1] ,由稳定扩展转为非稳定扩展的交界点 ,以此点作为混凝土小试件的临界点(破坏点 ) ,用来确定相应的极限强度和极限拉伸值。更多还原

【Abstract】 In the state of short-time loading,the interpoint of anticrack test piece from steady expansion to unsteady expansion can be determined by experiment with fracture mechanics analysis and the organism of break and expansion inside the concrete considered. The inttrpoint can be acted as critical point (damage point) of small concrete test-piece to decide the corresponding limiting strength and limiting value.更多还原