Fatigue Behavior of Partially Composite-Insulated Concrete Sandwich Walls

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Title: Fatigue Behavior of Partially Composite-Insulated Concrete Sandwich Walls

Author(s): Nathan Teixeira and Amir Fam

Publication: Structural Journal

Volume: 114

Issue: 1

Appears on pages(s): 125-136

Keywords: axial load; basalt fiber-reinforced polymer; composite action; cyclic; fatigue; insulated; sandwich wall; shear connector

Date: 1/1/2017

Abstract:
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 (Pdef) and low (Pstr), 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.