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Ultimate strength behaviour of curved SCS sandwich composite beams…
Ultimate strength behaviour of curved SCS sandwich composite beams
Introduction_SCS
Applications
Submerged Tunnels, Ship Hulls, Bridge and Offshore decks, shear walls in the high-rise building
Advantages
Saving frameworks of concrete casting, Shortening site construction time, Relative high resistance to Static, Impact, and fatique Loadings
Two external steel skin plates & A sanwiched concrete core
Test results
General Load Defelction behaviors
Ultimate resistances and failure modes
Shear Ductility
Inclination angle of the shear failure surface
Experimental Program
Core materials:ULCC
High specific strength, Comparable ultimate flexural and tensile strengths, Elastic modulus is fifty percent of conventional NWC
Grades& Compressive strength: ULCC-30 (30MPa), ULCC-45(40MPa), ULCC-60(60MPa)
Made of
Ordinary Portland cement, Silica fume, Water, Chemical admixures, Polyvinil alcohol(PVA)fibers, Ceneosphers with particle sizes ranging from 10 to 400 micro meter
Steel materials & Connectors
Steel shells with thickness 4mm and 12 mm
Curved SCS sandwich beams
Fabrication process
Rolling the flat steel plate into shells with designed curvature
Welding headed studs to the steel shells
Welding side plate and fabricating the steel sketeton
Preparing frameworks and casting concrete
Curing of the specimen
Specimens
Different Curvatures: BS1, BS3, BS4
Different Connectors spacing: BS1, BS5
Different depths: BS1, BS6, BS7
Different Grades: BS1, BS8, BS9
Different horizontal restraints: BS10
Test Set up & measurements
Fixed Boundary condition
Objectives
Investigation of Ultimate strength behaviors under patch loading considering critical local ice contact pressure
Reporting the Failure mode and shear resistance
Thickness of steel skin shell
Curvature
Spacing of connectors
Depth of cross section
Strength of core materials
Boundary conditions
Discussions
Effect of steel content ratio:
Higher Stiffness and Shear resistance
Effect of curvature:
Firstly increases & then Decreases the shear resistance of the structure
Effect of spacing of the connectors:
Denser spacing increases the composite action, elastic stiffness & Shear resistance . But in general shear resistance decreases
Effect of the depth of the section:
Increases the shear resistance almost linearly
Effect of strength of the core material:
Shear resistance& Elastic stiffness increases
Effect of the boundary condition:
restraint increases the shear resistance
Conclusions
Shear ductility, Shear resistance & Elastic stiffness increases with increase in thickness
Increasing curvature first increases shear resistance and then decreases
Shear resistance is reduced as the spacing of connector increases
Increasing the depth increases
Shear resistnce increases as the strength of the ULCC core increases
Analytical models developed to predict the shear resistance
Strong horizontal restraint increases the shear resistance