The steel mesh reinforcement of road pavements is a technology mainly used in the maintenance of flexible superstructures. Past studies have proved the benefits due to this type of reinforcing related to the reflective crack control in asphalt overlays and to the reduc-tion of shear and traction stress states in asphalt concrete. The utilization of reinforced pave-ments is largely empirical and supported by many experiences and practical applications, but there is still a knowledge gap in the modelling techniques. This paper introduces a 2D and 3D modelling approach used in order to predict and better understand the response of a steel rein-forced pavement in presence of static and dynamic actions. This was done by using a widely spreads finite elements modelling (FE) software: ANSYS®. The models were developed by as-suming a perfect elasto-plastic behaviour for the asphalt concrete and a linear-elastic behaviour for the steel reinforcement. The seismic actions were simulated by assuming the presence of a bedrock at a depth of 6m from the embankment support plane applying a maximum project ac-celeration equal to 1g. In particular, comparisons between the unreinforced and the steel rein-forced pavement were previously performed by considering static and dynamic analysis for the 2D model. In this case, the reinforcement was placed at different pavement depths evaluating its most useful position. In order to validate the modelling approach, a 3D model has been also created. Harmonic analysis has allowed to analyze the frequency response and to identify the resonance frequencies. Static and dynamic analysis have been also performed showing the dif-ferences with the 2D model. Finally, the efficacy of the reinforcement was also valuated and confirmed in presence of pavement crack. The results showed in this paper allow to confirm the effectiveness of the steel mesh reinforce technology in different conditions (2D and 3D models, with and without cracks) providing useful instructions in their design and modelling techniques.
The use of steel mesh reinforcement for the cracking control in flexible pavements: FE analysis in static and dynamic conditions
AGOSTINACCHIO, Michele;CIAMPA, DONATO;OLITA, Saverio;SIMONETTI, MICHELE MASSIMO
2016-01-01
Abstract
The steel mesh reinforcement of road pavements is a technology mainly used in the maintenance of flexible superstructures. Past studies have proved the benefits due to this type of reinforcing related to the reflective crack control in asphalt overlays and to the reduc-tion of shear and traction stress states in asphalt concrete. The utilization of reinforced pave-ments is largely empirical and supported by many experiences and practical applications, but there is still a knowledge gap in the modelling techniques. This paper introduces a 2D and 3D modelling approach used in order to predict and better understand the response of a steel rein-forced pavement in presence of static and dynamic actions. This was done by using a widely spreads finite elements modelling (FE) software: ANSYS®. The models were developed by as-suming a perfect elasto-plastic behaviour for the asphalt concrete and a linear-elastic behaviour for the steel reinforcement. The seismic actions were simulated by assuming the presence of a bedrock at a depth of 6m from the embankment support plane applying a maximum project ac-celeration equal to 1g. In particular, comparisons between the unreinforced and the steel rein-forced pavement were previously performed by considering static and dynamic analysis for the 2D model. In this case, the reinforcement was placed at different pavement depths evaluating its most useful position. In order to validate the modelling approach, a 3D model has been also created. Harmonic analysis has allowed to analyze the frequency response and to identify the resonance frequencies. Static and dynamic analysis have been also performed showing the dif-ferences with the 2D model. Finally, the efficacy of the reinforcement was also valuated and confirmed in presence of pavement crack. The results showed in this paper allow to confirm the effectiveness of the steel mesh reinforce technology in different conditions (2D and 3D models, with and without cracks) providing useful instructions in their design and modelling techniques.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
