Characterization of Adaptive Reinforced Concrete Structures

Abstract

This paper discusses the research, development, and design considerations used to produce a Structural Information System (SIS) capable of characterizing the behavior of an adaptive reinforced concrete structure designed to withstand reverse loadings. The SIS consists of a collection of surface mounted and embedded sensors connected to a portable computer. The composite structure is reinforced with hollow carbon fiber tendons equipped with embedded strain gages and the work includes theoretical arguments, polymer concrete mix design, concrete testing, reinforcement selection and placement, sensor selection and placement, and structural testing and analysis. The primary objective is to insure that the stress in the materials remains within the elastic range so that damage does not occur. A finite element model is developed to accurately characterize the structural response in the elastic range and a hybrid approach is suggested in which displacement, strain, and stress can be obtained with a rudimentary SIS consisting of a single embedded sensor. The ability to characterize failure, once it occurs, is also demonstrated by analyzing data obtained from displacement-controlled tests. Results indicate that splices in the tendons and slippage between the tendons and the concrete help to prevent sudden failure and allow the structure to withstand relatively high service loads despite appreciable deformation.