Stiffness For Linear Seismic Analysis Of Concrete Walls

The method accounts for the initial section stiffness ecigprior to cracking and the retention of initial stiffness after cracking due to axial compression from gravity loads closing cracks.

Stiffness for linear seismic analysis of concrete walls.

Perry adebar ahmed m. Effective flexural stiffness for linear seismic analysis of concrete walls. Effective stiffness for seismic analysis author s. Test of high rise core wall.

Stiffness is an important parameter for the seismic design of shear walls which is related to the shear force distribution of each wall member. Design codes and seismic standards e g fema asce and aci provide factors to reduce stiffness to account for the effects of cracking in the analyses and design. The effective stiffness of a wall structure is determined by obtaining the linear. Subsequent analysis of these buildings demonstrated that their structural walls provided sufficient stiffness to limit the displacement response and seismic damage.

Chapter to determine a linear flexural stiffness that can be used for the linear seismic analysis. A trilinear bending moment curvature model is used to develop a general method for determining the effective flexural stiffness of concrete walls for use in linear seismic analysis. A test was conducted on a large scale model of a concrete. In chapter 2 having been validated against the experimental results in chapter 3 is used in this.

However this method presents its challenges including the following. A reduction factor is usually applied to the stiffness to account for the effect of cracking in linear analysis. A trilinear bending moment curvature model is used to develop a general method for determining the effective flexural stiffness of concrete walls for use in linear seismic analysis. However the basis for these stiffness reduction factors or stiffness expressions is not clearly presented in these standards and their applicability to nuclear plant elements could not be assessed nureg cr 6926.

5 appears on pages s. Concrete walls without aci 318 14 special. See for example blume et al. The appropriate stiffness for the linear analysis is an effective initial stiffness consistent with the bilin ear force deformation assumptions that were used to establish this traditional design approach.

Empirical evidence suggests that the use of a large wall density and thus a large lateral stiffness has contributed to remarkable performance for these buildings following large earthquakes.