Modelling of strengthened hollow brick infills

Abstract

Strengthening the existing hollow brick infill walls by bonding high-strength precast concrete panels or applying steel fibre reinforced mortar was found to be an occupant-friendly seismic retrofitting technique for the buildings in use with deficient reinforced concrete structural systems. Both techniques convert the existing non-structural hollow brick infill walls into load-carrying structural members. To verify the effectiveness of the techniques, 20 reinforced concrete frames with hollow brick infill walls were tested under reversed cyclic lateral loading simulating earthquake.In the present study, hollow brick infill walls strengthened by these techniques were modelled by means of two equivalent diagonal struts in the analytical studies. Analytical results matched well with the experimental results. A performance-based rehabilitation case study of an existing building showed that both techniques offer a sound and practical solution for rehabilitation studies.

Cyclic testing of low-strength plain concrete

“…In this procedure, the seismic performance of members in both existing deficient and retrofitted RC structures depends on the strain value of longitudinal reinforcement and concrete on the member section. Hence, the stress-strain relation is important while evaluating RC columns and beams (Baran et al, 2013;Binici et al, 2007) with respect to the TEC (MPWS, 2007). Hence, whether the existing concrete models of Karsan and Jirsa (1969) and Mander et al (1988) can simulate the monotonic and cyclic behaviour of LSPC is an important issue.…”

Comparison of seismic performances of reinforced concrete frames strengthened by different techniques

“…Since this layer can be considered as a homogeneous and isotropic material; the geometrical properties of the second strut can be calculated using the method proposed by Smith and Carter (1969). In order to be able to model this layer, pushover analysis was conducted to compare the results of twenty RC framed test specimens (Baran et al 2013). Inelastic plane frame computer program DRAIN-2DX (Allahabadi and Powell, 1988) was used for the pushover analyses of the test frames.…”

“…In the study conducted by Baran et al (2013), pushover analyses were conducted to be able to define values for the constant λ in equation 4 for mortar and plate strengthening techniques, respectively. For this purpose, displacement controlled non-linear pushover analyses were performed for different values of λ.…”