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Fatigue Behavior of Partially Composite Insulated Concrete Sandwich Walls
Seven fatigue tests were performed on four precast insulated sandwich panels with either steel or basalt fiber-reinforced polymer (BFRP) flexural reinforcement and shear connectors. Cyclic bending was conducted at two loading amplitudes: high and low (PstI), representing serviceability limits for deflection and stress, respectively; both were considerably higher than the maximum national wind load. The effect of a moderate axial load, as in load-bearing walls, was examined. The panels initially had a degree of composite action (DCA) of 76 to 84%. The axially loaded steel-reinforced panel achieved 1 million cycles under Pstr, then another 1 million under Pdef. Its DCA reduced to 73, then 65%. Without axial load, 1 and 0.24 million cycles were achieved under Pstr and Pdef, and DCA reduced to 69% and 22%, respectively. The BFRP panel failed at 0.07 million cycles at Pstr. Its DCA reduced from 76 to 69%. It was then axially loaded and retested successfully to 1 million cycles. Stiffness degradations of 12 to 50%-consistent with DCA reductions-were observed.
Fatigue Behavior of Partially Composite Insulated Concrete Sandwich Walls
Seven fatigue tests were performed on four precast insulated sandwich panels with either steel or basalt fiber-reinforced polymer (BFRP) flexural reinforcement and shear connectors. Cyclic bending was conducted at two loading amplitudes: high and low (PstI), representing serviceability limits for deflection and stress, respectively; both were considerably higher than the maximum national wind load. The effect of a moderate axial load, as in load-bearing walls, was examined. The panels initially had a degree of composite action (DCA) of 76 to 84%. The axially loaded steel-reinforced panel achieved 1 million cycles under Pstr, then another 1 million under Pdef. Its DCA reduced to 73, then 65%. Without axial load, 1 and 0.24 million cycles were achieved under Pstr and Pdef, and DCA reduced to 69% and 22%, respectively. The BFRP panel failed at 0.07 million cycles at Pstr. Its DCA reduced from 76 to 69%. It was then axially loaded and retested successfully to 1 million cycles. Stiffness degradations of 12 to 50%-consistent with DCA reductions-were observed.
Fatigue Behavior of Partially Composite Insulated Concrete Sandwich Walls
Teixeira, Nathan (author) / Fam, Amir
ACI structural journal ; 114
2016
Article (Journal)
English
Analysis of partially composite foam insulated concrete sandwich structures
| Online Contents | 2015