Development of P-I model for FRP composite retrofitted RC columns subjected to high strain rate loads using LBE function

Abstract

The efficiency of fibre reinforced polymer (FRP) in strengthening the concrete structure against blast loads is investigated for RC columns exposed to blast loads. It should be mentioned that no systematic investigations derived pressure and impulse (P-I) models for FRP retrofitting RC columns in the literature. Thus, the primary goal of this project is to construct a finite element model that will offer data for the development of a P-I diagram that can be utilized to mitigate blast threats and predict damage in RC columns retrofitted with FRP. Another aspect of the present work is to propose a new technique to determine the damage index to identify the capacity degradation of the RC columns when exposed to extreme loads in the current research various strengthening schemes are quantitatively tested against blast loads by doing LS-DYNA software. Numerical simulation of blast load is implemented by using Load-Blast-Enhanced (LBE) technique. The models are validated through experimental work to assess the correctness of model simulations in order to illustrate the models behavior. The structural behavior of un-strengthened RC columns was compared to the structural behavior of various columns retrofitted with varying FRP wrap thickness, strength, and arrangement. The simulations revealed that strengthening columns with FRP is a viable strategy to improve their explosion resistance capability, and that retrofit procedures are useful in minimizing the building's hazard. Engineers can utilize the P–I curves obtained to assess the damage levels of new columns and to estimate the damage levels of existing columns subjected todifferent extreme load scenarios.