Effect of Constitutive Material Models on Seismic Response of Two-Story Reinforced Concrete Frame

Abstract

This paper focuses on the finite element (FE) response sensitivity and reliability analyses considering smooth constitutive material models. A reinforced concrete frame is modeled for FE sensitivity analysis followed by direct differentiation method under both static and dynamic load cases. Later, the reliability analysis is performed to predict the seismic behavior of the frame. Displacement sensitivity discontinuities are observed along the pseudo-time axis using non-smooth concrete and reinforcing steel model under quasi-static loading. However, the smooth materials show continuity in response sensitivity at elastic to plastic transition points. The normalized sensitivity results are also used to measure the relative importance of the material parameters on the structural responses. In FE reliability analysis, the influence of smoothness behavior of reinforcing steel is carefully noticed. More efficient and reasonable reliability estimation can be achieved by using smooth material model compare with bilinear material constitutive model.

Modeling of Heavy Armocement Deformation for the Conical Shape of the Heat Accumulator Body by the Methods of Computer Engineering

“…The external load is applied to the two mutually orthogonal sides of the model through absolutely rigid plate elements, which are connected to the model by means of flexible rods to avoid an uneven load distribution between the model elements. The hypothesis of flat sections and the appearance of transverse shear strains were fulfilled [17][18][19]. Rigid elements are given flexural rigidity 10 times greater than the rigidity of steel rods: Е=2·106 MPa; ν=3.…”