NUMERICAL METHOD AND RANDOM ANALYSIS OF CEMENT CONCRETE EXPANSION
摘要
The numerical method and random analysis of cement concrete expansion are given.A mathematical procedure is presented which includes the nonlinear charac teristics of the concrete.An expression is presented to predict the linear restrained expansion of expansive concrete bar restrained by a steel rod.The results indicate a rapid change in strains and stresses within initial days, after which the change gradually decreases.A reliable and accurate method of predicting the behavior of the concrete bulkheads in drifts is presented here.Extensive sensitivity and parametric studies have been performed. The random density distributions of expansive concrete are given based on the restricted or unrestricted condition. These studies show that the bulkhead stress fields are largely influenced by the early modulus of the concrete and the randomness of the ultimate unrestrained expansion of the concrete.