Experiments and Elastic/Viscoplastic Constitutive Modeling of Concrete and Geomaterials.

摘要

Confined, unconfined, dynamic, and quasistatic compressive tests were conducted on strain gage instrumented specimens of concrete, mortar, and granite to produce data for determination of the parameters of an elastic/viscopiastic (EVP) constitutive model of these materials. In addition, concrete grout specimens were tested in dynamic and quasistatic compression to observe columnar fracture and changes in ultrasonic wave speeds. The EVP model captures the basic features of the material behavior such as strain-hardening, confining pressure, rate influence, creep, and relaxation phenomena. The model is applicable to fully 3-D stress conditions, but all parameters can be determined from the results of a few quasistatic and dynamic tests. Reasonable agreements between model and tests were obtained within the natural scatter of the data.