Implementation and verification of a masonry panel model for nonlinear dynamic analysis of infilled RC frames

Abstract

The effect of infill panels on the response of RC frames subjected to seismic action is widely recognised and has been subject of numerous experimental investigations, while several attempts to model it analytically have been reported. In this work, the implementation, within a fibre-based Finite Elements program, of a double-strut nonlinear cyclic model for unreinforced masonry panels is carried out. The adequacy of the model in predicting the cyclic/seismic response of multi-storey infilled reinforced concrete frames is then verified through comparisons against experimental results.

FRP Strengthened Brick-Infilled RC Frames: An Approach for their Proper Consideration in Design

“…The masonry panel element model used in the present study was originally developed by Crisafulli [9] and calibrated by Smyrou [19], to simulate the nonlinear response of masonry in frame structures [10]. Each panel element contained six elements: two struts parallel to each diagonal that transferred the axial load between the two diagonal nodes and a pair of springs related to each diagonal (one for each direction of loading) that transferred the shear load from the top of the wall to the base.…”

“…Two different hysteretic rules apply for the total representation of the infill response: (i) a masonry strut hysteresis model for the diagonal struts, and (ii) a bilinear hysteresis rule for the shear springs. In Fig The main parameters characterizing this type of element as implemented in Seismostruct [29] and shortly described by Smyrou [19] and Smyrou et al [37], are the following: a. Strut Curve Parameters…”

“…The contribution of infill walls to lateral stiffness depends on the type of loading and is drastically reduced under reversed cycling loading [7]. In engineering practice, infill walls are usually modelled as a combination of diagonal struts following a macro-modelling approach [8][9][10] without significant loss of accuracy. However, more complex models, such as finite element models with a micromodelling approach, with the use of constitutive relations available in the literature should be implemented to account for the non-linearity of the response of infilled RC frames, the accurate detection of possible failure modes and the verification of simplified models considering the effects of several critical factors, including the width-to-the-height of the infilled frame ratio and friction mechanism at the interface between the frame and the infill [11][12][13][14][15][16][17][18].…”

“…However, more complex models, such as finite element models with a micromodelling approach, with the use of constitutive relations available in the literature should be implemented to account for the non-linearity of the response of infilled RC frames, the accurate detection of possible failure modes and the verification of simplified models considering the effects of several critical factors, including the width-to-the-height of the infilled frame ratio and friction mechanism at the interface between the frame and the infill [11][12][13][14][15][16][17][18]. In such models, openings can also be considered, the location and dimensions of which significantly affect the stiffness and the strength characteristics of the infills [13,19,20].…”

Effect of Infill Walls on the Drift Behavior of Reinforced Concrete Frames Subjected to Lateral-Load Reversals

“…The global response of the multi-story structures are typically studied by computer simulations based on the local data [Madan et al, 1997;Dolsek and Fajfar, 2002;Smyrou et al, 2008;Rodrigues et al, 2008;Gerardo et al, 2011]. There is a limited set of experimental studies that have multi-story specimens to investigate the effect of local behavior on the global response of the system [Fiorato et al, 1970;Dolsek and Fajfar, 2001;Pinto and Taucer, 2006;Pujol and Fick, 2010].…”