A normal density concrete has a compressive strength(fc)of 10,000 psi and modulus(Ec)of 5,500 ksi. Strain corresponding to peak stress(0)is0.00230. A compressive stress is applied to the concrete. Use equation Thorenfeldt, Tomasqewicz, and Jensen (1987). (a) This stress is increased in value from zero to8,000psiover a short period of time and is then reduced to 5,000 psi. Calculate the compressive strain in concrete at this point in time (b) The strain is then increased to0.0022. Calculate the compressive stress at this point in time. (c) Finally, the stress is reduced to zero. Calculate the residual compressive strain that remains in the concrete after the compressive stress has been removed.