Seismic Assessment of Non-conforming Infilled RC Buildings Using IDA Procedures

Abstract

The seismic performance of existing non-conforming reinforced concrete (RC) buildings is numerically investigated, taking into account the presence of clay brick masonry infill walls. The effect of infill walls on the seismic response of RC frames is widely recognised and has been a subject of numerous analytical and experimental investigations. In this context, Static Pushover analyses of typical existing RC infilled frames have established these structures' inelastic characteristics, focusing on the significant contribution of infill walls to their dynamic characteristics, overstrength, form irregularity and damage. Furthermore, more comprehensive studies of inelastic static response considered the typical variability among different generations of constructed buildings in Greece since the 60s in the form, the seismic design and detailing practice and the structural materials, with different masonry infill configurations and properties. In the present study, the results from such Static Pushover analyses are extended with Incremental Dynamic Analysis predictions using a large number of recorded base excitation from recent destructive earthquakes in Greece and abroad. Evaluation of the time history predictions and comparisons with the Static Pushover analysis findings corroborate that the presence of regular arrangements of perimeter infill walls increase considerably the stiffness and resistance to lateral loads of the infilled RC structures, while at the same time, reducing their global ductility and deformability. Fully or partially infilled RC frames can perform well, while frames with an open floor usually have the worst performance due to the formation of an unintentional soft storey. The analyses further prove that lower strength masonry provides the building with lower overstrength but higher ductility.

Insights: Frontiers in Built Environment

“…These composite structures are also referred to as infilled frames and have increased lateral stiffness than structures that have bare frames. In the past six decades, extensive experimental and numerical research has been conducted to understand the combined behaviour of infilled frames, but most of these scholars investigated the behaviour and capacity of masonry infills built inside concrete or steel frames (Mehrabi et al, 1996;Chen and Liu, 2016;Margiacchi et al, 2016;Repapis and Zeris, 2019). Only a few researchers investigated the response of steel frames connected with infill RC walls (Makino et al, 1980;Saari et al, 2004;INNO-HYCO, 2015;Vogiatzis and Avdelas, 2018;Pallarés et al, 2020).…”

The wall–frame interaction effect in CLT-steel hybrid systems

“…These composite structures are also referred to as infilled frames and have increased lateral stiffness than structures that have bare frames. In the past six decades, extensive experimental and numerical research has been conducted to understand the combined behaviour of infilled frames, but most of these scholars investigated the behaviour and capacity of masonry infills built inside concrete or steel frames (Mehrabi et al, 1996;Chen and Liu, 2016;Margiacchi et al, 2016;Repapis and Zeris, 2019). Only a few researchers investigated the response of steel frames connected with infill RC walls (Makino et al, 1980;Saari et al, 2004;INNO-HYCO, 2015;Vogiatzis and Avdelas, 2018;Pallarés et al, 2020).…”