Studying the Behavior of the Strengthened Flat Slab Structures Using Based-mortar Intervention Methods with ABAQUS Finite Element Analysis

Abstract

Flat slab structures, a prevalent architectural component in various construction projects, are known for their flexibility and efficient space utilisation. However, with the rapid advent and mass adoption of electric vehicles (EVs), which inherently weigh more than conventional vehicles, a significant concern arises about the slab's vulnerability to punching shear failure. This is particularly evident in multi-storey car parks, as EVs exert additional pressure on flat slab systems not designed for such loads. This study extensively explores strengthening flat slab systems using Engineered Cementitious Composites (ECC), leveraging the ABAQUS finite element analysis tool. By recreating and analysing slab specimens, namely C1 (the control), U3 (strengthened with an ECC layer), and U4 (strengthened with a normal concrete layer), we aim to provide an in-depth understanding of the behaviour and performance of these slabs under increased loads. Our methodology consisted of a robust literature review, followed by preliminary modelling in ABAQUS to familiarise with its capabilities. Detailed finite element models were then developed based on the chosen literature, with particular attention given to replicating the geometric, material properties, and boundary conditions of the specimens. A critical phase was comparing the finite element model results with experimental data from the selected literature. Through our analysis, we identified several nuances. For instance, while specimen C1 demonstrated greater initial stiffness experimentally, the ABAQUS model showed U3 and U4 to possess superior rigidity. Moreover, variations in mesh sizes in ABAQUS had a pronounced effect on the load-displacement curves. Finetuning the viscosity parameter altered the load-bearing capacity of the slabs, and boundary conditions, especially the width of supports, played a pivotal role in influencing slab behaviour. In conclusion, the study accentuates the importance of strengthening flat slab structures, especially during EV proliferation. ECC, when modelled accurately, can be an effective solution. This research's findings underscore the potential of ABAQUS as a reliable tool for understanding and predicting the behaviour of strengthened flat slabs and provide insights into the structural adjustments needed in the real world to cater to emerging structural loads.