Civil Engineering ETDs

Publication Date

5-27-1965

Abstract

Under present design methods, the modulus of elasticity is designated only with respect to the ultimate strength and the unit weight of concrete and is assumed constant throughout the life of the structure. The only provision made for change in the modulus of elasticity due to age, moisture content, type of loading or fatigue is to assume the weakest condition of the concrete. On elastic analysis the stress-strain relationship is assumed to be linear and the concrete is assumed to carry no tensile stress. In ultimate design procedures the concept of straight line distribution of stress is dropped and a nonlinear stress-strain distribution of stress is dropped and nonlinear stress-strain curve assumed in ultimate analysis. However, this nonlinear stress-strain distribution is that of a specimen loaded only once. The only consideration given to the effects of repeated loading is that of fatigue. The effects of fatigue are assumed not to control of the maximum working stress is below 45 percent to 55 percent of the material. Other effects of repeated loading on the concrete are not utilized.

Document Type

Thesis

Language

English

Degree Name

Civil Engineering

Level of Degree

Masters

Department Name

Civil Engineering

First Committee Member (Chair)

Edward James Rhomberg

Second Committee Member

Marion Marvin Cottrell

Third Committee Member

José Eleazar Martinez

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