水泥混凝土直接拉伸试验研究

Study on Direct Pulling Experiment of Concrete

混凝土结构的开裂,一般的情况是由于拉应力引起的.试验证明,利用机械式双向拉伸仪,进行混凝土的直接单、双向拉伸试验是可行的,结果可靠.试验还表明,混凝土的直拉强度明显低于弯拉强度,而且,其双向拉伸强度比其单向拉伸强度还要低,表现出明显的双向拉伸强度弱化现象.试验方法和有关数据可供工程实践参考.

The crack of concrete structure was commonly aroused by tension stress. The experimentd results showed that it was feasible and tried to using mechanical two-way switch apparatus to do uniaxial and bidirectional direct pulling experiment of concrete. It was also showed that the direct pulling strength of concrete was obviously lower than the resistance to bending and tensile strength. And the bidirectional tensile strength was lower than the uniaxial tensile strength; it was showed obviously bidirectional tensile strength weakening effort. The method of experiment and relational data can be consulted for engineering.