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Structural Research Series 543PDF


Title:Effects of Creep and Shrinkage on the Behavior of Reinforced Concrete Gable Roof Hyperbolic-Paraboloids
Author(s):Gallegos-Cazares, Sergio; Schnobrich, William C.
Subject(s):Reinforced concrete
Shells (Engineering)
Concrete -- Creep
Abstract:Time dependent deformations due to creep and shrinkage modify the response of structures sensitive to small geometrical changes such as the hyperbolic-parabola. In this investigation, a general finite element program is extended to consider time dependent and time independent characteristics of concrete in shell-beam structures. Cracking, concrete compressive nonlinearity, steel nonlinearity, and concrete-steel interaction are considered in the time independent model, while aging, creep and shrinkage are included in the time dependent one. With the model implemented, a series of studies are developed considering the structural effect of several parameters on the time dependent response of gabled roofs. Among the parameters considered, the manner of constraint in the support, and the size and position of the crown beams are important. A decrease of 25% to 50% in the load carrying capacity level has been observed considering time dependent effects, displacements are increased four to eight times from the time independent ones, and large stress redistributions have been found to occur with a shift in the load carrying mechanisms from membrane to flexural. Design considerations emerging from the numerical results are highlighted in an effort of improve our design criteria basis for this kind of structures.
Issue Date:1988-11
Publisher:University of Illinois Engineering Experiment Station. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Civil Engineering Studies SRS-543
Genre:Technical Report
Sponsor:National Science Foundation Research Grant MSM 87-03352
Date Available in IDEALS:2009-11-04
Identifier in Online Catalog:1565770

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