Effect of Masonry Infill Constitutive Law on the Global Response of Infilled RC Buildings

Abstract

Masonry-infilled reinforced concrete frames represent a very common construction typology across the Mediterranean countries. The presence of infills substantially modifies the global seismic performances of buildings in terms of strength, stiffness, and energy dissipation. Although several research studies focused on the overall performances of infilled reinforced concrete frames, the modeling of infill panels remains an open issue due to the complex interaction between the infill and the frame and the uncertainties involved in the definition of the problem. In the present paper, an existing masonry-infilled RC frame designed according to obsolete seismic codes is chosen as a case study. A refined three-dimensional finite element model is built for performing nonlinear static and time-history analyses in order to investigate some significant aspects related to the modeling of infills. In particular, it is investigated the effect of different infill constitutive models on the seismic performance of infilled RC building expressed in terms of engineering demand parameters such as interstory drift ratios and peak floor accelerations, and on the generation of damage fragility curves.

The Use of Stick-It Model for Edp Assessment in Existing Rc Infilled Typologies

“…The opening percentage is considered constant and equal to 20% of the area of the infill panel. The adoption of different opening percentages along the height also significantly influences the builing response and the distribution of lateral deformations (e.g., [21]- [22]). However, this effect is not investigated in this study.…”

“…Further, by keeping as a reference the panels with tw=24cm, the maximum scatter between different thicknesses is obtained for the AQK record in the transverse direction, at the third story, where a scatter of 76% in IDR value is achieved. The effect of infill thickness produces a significant variation of IDR [22], and thus of the potential damage experienced by drift-sensitive components.…”

“…At the building level, the most complete procedure to assess building structural performances consists of performing Nonlinear Response History Analyses (NRHA) on refined finite element models (e.g., [2]). However, the structural modeling and computational effort required for the analysis at the single building level are not suitable also for large-scale analyses.…”

Subarea Description and Breakage Constitutive Model of Rock Mass Based on CT Test

“…It was concluded that the maximum stress decreased with increasing temperature, and it increased with an increasing strain rate. These people established the constitutive models required for quantitative analysis based on experimental samples, but these have rarely been combined with CT experiments [9,[12][13][14][15][23][24][25][26][27][28][29][30].…”