Summer 2010 | PCI Journal 46 Impact of interaction between adjacent webs on the shear strength of prestressed concrete hollow-core units Shaohong Cheng and Xuefei Wang Hollow-core units are precast concrete members that contain continuous voids to reduce the self-weight and fab- rication cost of the units. Hollow-core units are universally manufactured under controlled plant conditions and are always prestressed. Prestressing strands are placed at the bottom of the units between the voids. Typical hollow-core span ranges are from 4.6 m (15 ft) to 12.2 m (40 ft). Hollow-core is used primarily for floor and roof-deck systems in office buildings, apartments, condominiums, and other residences. Hollow-core units are manufactured using two basic processes: dry casting or wet casting. Units may be extruded on long-line prestressing beds using low-slump concrete, creating cores with augers or tubes; or by slip forming using high-slump concrete with cores formed by pneumatic tubes attached to the form or long tubes attached to the casting machine. Design of hollow-core units is governed by the Ameri- can Concrete Institute’s Building Code Requirements for Structural Concrete (ACI 318-05) and Commentary (ACI Editor’s quick points n The Building Code Requirements for Structural Concrete (ACI 318-05) and Commentary (ACI 318R-05) may underestimate the shear capacity of prestressed concrete hollow-core units. n ACI 318’s conservative estimates might be due to the neglect of the contribution of adjacent-web interaction to the shear strength of units. n Hollow-core-web interaction’s contribution to shear strength is investigated in this paper through experiments and finite- element analyses of full-sized hollow-core units and strips of the unit (I-shaped beams).
Impact of interaction between adjacent webs on the shear strength of prestressed concrete hollow-core units
Jun 30, 2023
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