Rayomd E. Davis

Bio: Rayomd E. Davis is an academic researcher. The author has contributed to research in topics: Compressive strength. The author has an hindex of 1, co-authored 1 publications receiving 15 citations.

Mathematical modeling of creep and shrinkage of concrete

Abstract: Part 1 Memorials: Robert L'Hermite and his legacy, M.Fickelson the impact of Robert L'Hermite on the evolution of creep and shrinkage theory, Z.P.Bazant a tribute to Douglas McHenry, B.Bresler Hubert Rusch and his legacy, H.Hilsdorf. Part 2 State-of-the-art in mathematical modelling of creep and shrinkage in concrete: physical mechanisms and their mathematical description, J.F.Young et al material models for structural creep analysis, Z.P.Bazant et al creep and shrinkage analysis of structures, O.Buyukozturk et al finite element analysis of creep and shrinkage, C.A.Anderson et al probabilistic models, T.Tsubaki et al conclusions for structural analysis and for formulation of standard design recommendations. Part 3 Summaries of discussions from the symposium: physical mechanisms and their mathematical description, U.Schneider material models, P.E.Roelfstra structural analysis, V.Kristek finite element analysis, L.Cedolin uncertainty of creep and shrinkage predictions, S.G.Reid current research in material modelling, J.W.Dougill current research in structural analysis, B.Espion. Appendices: list of lectures and papers presented at the symposium list of participants.

Creep of Concrete: Influencing Factors and Prediction

Abstract: Two titles published in one volume. "Creep of concrete: influencing factors and prediction" by Adam M Neville and Bernard L. Meyers and "Effect of creep and shrinkage on the behavior of reinforced concrete members" by Adrian Pauw and Bernard L. Meyers.

On the variability of the creep coefficient of structural concrete

Abstract: Experimental data from many creep test series are compared with predictions from various formulas in international codes. A mathematical simple creep formula is proposed and its accuracy is determined from comparison with the experimental data. Based hereon, a probabilistic model for the creep coefficient is proposed and the different sources of uncertainty are quantified. The proposed model is well suited for hand calculations.

Predicting the Creep Strain of PVA-ECC at High Stress Levels based on the Evolution of Plasticity and Damage

Abstract: This paper describes a method for estimating creep deformations of PVA-ECC under high stress levels from short-term tests. To obtain necessary data, a series of accelerated bending and compression creep tests under a sequence of increasing loads were carried out. Of particular interest was to study the evolution of plasticity and damage under varying load levels, and thus allow the rate of plasticity and fracturing as functions of evolving strain and fracture to be determined. Based on these behavioral aspects, predictions of creep of ECC at high stress levels were made. It is found that creep rupture in flexure and compression occurs at nearly the same order of lifetime in a logarithm scale, being the rupture at 90% of flexural strength about one order longer than that under compression. The tensile and compressive strains at rupture, when the load level is decreased from 90% to 75% of the short-term strength, are 1.1-1.4 and 1.6-3.5 times the short-term tensile and compression strain capacities, respectively.