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Demountable steel-concrete composite beam with full-interaction and low degree of shear connection
Abstract It is suitable to use precast steel-concrete composite beams to quickly assemble a bridge or a building, particularly in isolated regions where cast-in-situ concrete is not a practical option. If steel-concrete composite beams are designed to allow demountability, they can also be extremely useful in the aftermath of natural disasters, such as earthquakes or flooding, to replace damaged infrastructure. Furthermore, rapid replacement of slabs is extremely beneficial in case of severe deterioration due to long-term stressors such as fatigue or corrosion. The only way to rapidly assemble and disassemble a steel-concrete composite structure is to use demountable shear connectors to connect/disconnect the steel beams to/from the concrete slab. In an attempt to respond to this demand, recent research developed a removable Friction-Based Shear Connector (FBSC), which eliminates slippage in the steel-concrete interface at SLS (i.e. it offers full-interaction). This paper describes the experimental program that assessed the flexural behaviour of a 9.0 m precast steel-concrete composite beam equipped with FBSCs. The design of the composite beam was based on a 32% degree of partial shear connection, i.e. considerably below the minimum degree specified in Eurocode 4. The paper gives a detailed account of the test results that clearly show that the composite beam with the FBSCs is effective and has properties that match design needs for both SLS and ULS verifications.
Highlights To allow easy assembly/disassembly in precast steel-concrete composite beams, demountable shear connectors are recommended. Steel-concrete composite beams can be designed as full shear connection or partial shear connection. Friction based shear connectors can be used to create full interaction with low ratio of shear connection. The performance of the composite beam was studied using concrete and steel strains, displacements, and loads. The study includes comparison between pushout tests and beam tests.
Demountable steel-concrete composite beam with full-interaction and low degree of shear connection
Abstract It is suitable to use precast steel-concrete composite beams to quickly assemble a bridge or a building, particularly in isolated regions where cast-in-situ concrete is not a practical option. If steel-concrete composite beams are designed to allow demountability, they can also be extremely useful in the aftermath of natural disasters, such as earthquakes or flooding, to replace damaged infrastructure. Furthermore, rapid replacement of slabs is extremely beneficial in case of severe deterioration due to long-term stressors such as fatigue or corrosion. The only way to rapidly assemble and disassemble a steel-concrete composite structure is to use demountable shear connectors to connect/disconnect the steel beams to/from the concrete slab. In an attempt to respond to this demand, recent research developed a removable Friction-Based Shear Connector (FBSC), which eliminates slippage in the steel-concrete interface at SLS (i.e. it offers full-interaction). This paper describes the experimental program that assessed the flexural behaviour of a 9.0 m precast steel-concrete composite beam equipped with FBSCs. The design of the composite beam was based on a 32% degree of partial shear connection, i.e. considerably below the minimum degree specified in Eurocode 4. The paper gives a detailed account of the test results that clearly show that the composite beam with the FBSCs is effective and has properties that match design needs for both SLS and ULS verifications.
Highlights To allow easy assembly/disassembly in precast steel-concrete composite beams, demountable shear connectors are recommended. Steel-concrete composite beams can be designed as full shear connection or partial shear connection. Friction based shear connectors can be used to create full interaction with low ratio of shear connection. The performance of the composite beam was studied using concrete and steel strains, displacements, and loads. The study includes comparison between pushout tests and beam tests.
Demountable steel-concrete composite beam with full-interaction and low degree of shear connection
Suwaed, Ahmed S.H. (author) / Karavasilis, Theodore L. (author)
2020-05-13
Article (Journal)
Electronic Resource
English
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