Modelling of RC Moment Resisting Frames with Precast-prestressed Flooring System

摘要

In this paper, the seismic performance of reinforced concrete momentresisting frames coupled with a floor containing precast-prestressed units is examined.Mechanisms associated with the beam strength enhancement arising from plastic hingesand floor interactions are described. A computational model is set up to predict theresponse of a 3D frame containing precast-prestressed floor units with cast-in-situconcrete topping. This model contains newly developed plastic hinge elements whichaccount for flexural, shear and elongation response of plastic hinges in beams subjectedto inelastic rotation and varying axial load levels. To allow for floor interaction with thebeam plastic hinges, the model uses axial strut-and-tie elements to represent the linkingslab between the longitudinal beams and the first precast unit. Analysis using this modelshows good agreement with the experimental results indicating that the model can beused to analyse the seismic performance of RC frames containing precast-prestressedflooring systems.