Seismic Safety Assessment of Buildings with Fly-Ash Concrete

Abstract

Sustainable concrete construction has encouraged the utilization of industrial wastes (fly ash, silica fume, ground granulated blast furnace slag, metakaolin, etc.) as a composite cementitious material due to its high pozzolanic activity. Among them, fly ash (FA) concrete is gaining high popularity in the construction industry due to its several benefits to the concrete structures with increased structural performance. In order to estimate the seismic performance of FA concrete buildings, a probabilistic study needs to be performed for its mechanical parameters at various performance limit states. Weibull, normal, log-normal and gamma distribution probability distribution models are considered for three goodness-of-fit tests such as the Kolmogorov-Smirnov (KS), Chi-square (CS) and log-likelihood (LK) tests. Among them, the lognormal distribution is found to be the closest distribution in describing the variations in the mechanical properties of FA concrete as compared to other distributions. It was observed that 20% to 40% partial replacement of FA with cement gives an improved performance to the structures with enhanced structural safety at economical cost.

Variability of coal mine overburden incorporated concrete and its effect on the seismic safety of reinforced concrete building

“…The concrete quality encompasses both its strength and ductility properties, including dispersions therein 30 . However, it is essential to note that the present study exclusively focuses on the strength aspect of CMOB‐incorporated concrete, aligning with the approach taken in certain prior investigations 28,29,31 . The ductility properties of CMOB‐incorporated concrete are assumed to be equivalent to those of conventional concrete in the present study.…”

“…30 However, it is essential to note that the present study exclusively focuses on the strength aspect of CMOB-incorporated concrete, aligning with the approach taken in certain prior investigations. 28,29,31 The ductility properties of CMOBincorporated concrete are assumed to be equivalent to those of conventional concrete in the present study. Uncertainties in loading and strength must be taken into account when performing a probability-based seismic risk assessment.…”

“…22 Many researchers have looked at how the compressive and splitting tensile strengths of conventional concrete vary. [23][24][25][26][27][28][29] Various statistical norms and distribution functions to categorize the variability analysis of concrete compressive strength were developed by Chen et al 26 Due to the fact that the inherent qualities of CMOB and natural sand are not the same, it is possible that these studies on conventional concrete cannot be used to accurately evaluate the variability of CMOBincorporated concrete. Published literature shows substantial variation in the strength properties of concrete incorporated with CMOB, but no study has been able to convert these variations into a statistical distribution, which is necessary for limit state/reliability-based design.…”

“…In order to recommend the probability distribution function for use in explaining variability, statistical analysis is performed to characterize data on the compressive strength of concrete specimens 22 . Many researchers have looked at how the compressive and splitting tensile strengths of conventional concrete vary 23–29 . Various statistical norms and distribution functions to categorize the variability analysis of concrete compressive strength were developed by Chen et al 26 Due to the fact that the inherent qualities of CMOB and natural sand are not the same, it is possible that these studies on conventional concrete cannot be used to accurately evaluate the variability of CMOB‐incorporated concrete.…”