The paper describes the experimental results and the engineering interpretation of shear tests carried out at Politecnico di Milano on precast concrete wall elements characterised by inner lightening cavities contoured by a solid frame. At the base of the solid columns mechanical devices connect the wall element with the lower element or with the foundation. The presence of the lightening cavities does not allow for a clear collocation within the classical structural behaviour of walls or frames. This activity frames into a wider research program focused on an innovative dry-assembled precast system for residential constructions named Domus Dry® patented by DLC Consulting srl of Milan and received main funding from the programme “Brevetti+” (GU 179 02/08/2011). An experimental programme was carried out at the Laboratorio Prove Materiali Strutture e Costruzioni - Politecnico di Milano with the aim of characterising the shear behaviour of the wall under different reinforcement layouts: five full-scale wall specimens reinforced with different layouts were subjected to monotonic and cyclic testing through the application of a horizontal displacement history. Different failure modes corresponded to different reinforcement layouts. Failure in tension-shear was identified for weakly reinforced walls, whilst sliding-shear failure was identified for heavily reinforced walls. The tensile testing of the wall vertical joint performed within the global wall test configuration showed a satisfactory behaviour of the connection. A structural strut & tie modelling of the wall elements has been set to provide an engineering interpretation of the experimental results.
Experimental identification of the shear failure modes of a voided precast wall element subjected to lateral loading
B. Dal Lago;
2019-01-01
Abstract
The paper describes the experimental results and the engineering interpretation of shear tests carried out at Politecnico di Milano on precast concrete wall elements characterised by inner lightening cavities contoured by a solid frame. At the base of the solid columns mechanical devices connect the wall element with the lower element or with the foundation. The presence of the lightening cavities does not allow for a clear collocation within the classical structural behaviour of walls or frames. This activity frames into a wider research program focused on an innovative dry-assembled precast system for residential constructions named Domus Dry® patented by DLC Consulting srl of Milan and received main funding from the programme “Brevetti+” (GU 179 02/08/2011). An experimental programme was carried out at the Laboratorio Prove Materiali Strutture e Costruzioni - Politecnico di Milano with the aim of characterising the shear behaviour of the wall under different reinforcement layouts: five full-scale wall specimens reinforced with different layouts were subjected to monotonic and cyclic testing through the application of a horizontal displacement history. Different failure modes corresponded to different reinforcement layouts. Failure in tension-shear was identified for weakly reinforced walls, whilst sliding-shear failure was identified for heavily reinforced walls. The tensile testing of the wall vertical joint performed within the global wall test configuration showed a satisfactory behaviour of the connection. A structural strut & tie modelling of the wall elements has been set to provide an engineering interpretation of the experimental results.
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