Abstract
The article proposes resolving equations for eccentrically compressed reinforced concrete short columns obtained on the viscoelastic model basis. Comparison of the results obtained according to the theory of heredity, theory of hardening, aging, flow, kinetic theory, as well as the nonlinear theory of concrete creep by Yu.A. Gurieva is presented.
Highlights
IntroductionConsider a short reinforced concrete column compressed by force F applied eccentrically (figure 1)
If the creep law is given in differential form, from the calculated stresses we determine the rate of growth of creep strains and the value at the time moment:
The problem was solved for a reinforced concrete column with the following initial data: concrete elasticity modulus Eb 3 104 MPa, compressive strength of concrete R 20 MPa, ultimate creep characteristic С Eb 3, 0.05 days 1, k1 100, k1k2 1, cross-sectional dimensions are b 20 cm, h 40 cm, reinforcement elasticity modulus is ES 2 105 MPa, reinforcement compression strength Rsc 400 MPa, reinforcement rati o
Summary
Consider a short reinforced concrete column compressed by force F applied eccentrically (figure 1). The equilibrium equations for such column will be written in the form: F bdA S. where b are the stresses in concrete, S , АS are the stresses and the cross-sectional area of the most compressed reinforcing bars, and. Are the stresses and the cross-sectional area of the least compressed reinforcement, yS and yS/ is the distance from the crosssection centroid to the centers of the bars (see figure 1)
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