Retrofitting of existing frame structures through RC infilling: Experimental and analytical investigation

TitleRetrofitting of existing frame structures through RC infilling: Experimental and analytical investigation
Publication TypeThesis
Year of Publication2012
Strepelias E
Academic DepartmentDepartment of Civil Engineering
Number of Pages288
Date Published23/1/2012
UniversityUniversity of Patras
CityPatras, Greece
Thesis TypePhD thesis
Abstract

The construction of reinforced concrete infills is a very effective method for retrofitting multi – storey reinforced concrete buildings. The experimental research to date has conducted only at one or two storey specimens with infill thickness considerably smaller than the width of the members of the existing frame. Because of this lack of knowledge, Eurocode 8 - Part 3 does not cover this technique. The Greek code for Structural Interventions (Kan.Epe.) refers to the dimensioning of these walls only in terms of forces and does not provide means for calculating deformation at yielding and ultimate. The purpose of this study is to investigate the response of multi-storey reinforced concrete frames, retrofitted with reinforced concrete infill walls. Three 4-storey reinforced concrete frames infilled with reinforced concrete were tested at 75%-scale via the hybrid testing method. Parameters of investigation are both the reinforcement of the infill and the connection between the surrounding frame and the infill. Two types of connection were examined. The experimental results show that both connection options lead to a close to monolithic behavior of the specimens and to a favourable flexure-controlled energy absorbing mechanism. From the experimental results deformations characteristics at yielding and ultimate were calculated. The magnitude of these deformations are in good agreement with those predicted for a monolithic wall according to Eurocode 8 and Kan.Epe, if one takes into account the reduced fixed end rotation of the wall at the base of each floor due to the epoxy–grouting of the dowels into the frame members. To verify these conclusions nonlinear dynamic analyses were performed with increasing level of detailing. The comparison of experimental results with those of the analysis showed satisfactory convergence. (Full text in Greek).

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