TIME-DEPENDENT BEHAVIOR OF CONTINUOUS COMPOSITE BEAMS AT SERVICE LOADS

被引：81

作者：

GILBERT, RI

BRADFORD, MA

机构：

[1] Dept. of Struct. Engrg., School of Civ. Engrg., Univ. of New South Wales, Sydney

来源：

JOURNAL OF STRUCTURAL ENGINEERING-ASCE | 1995年 / 121卷 / 02期

关键词：

Concrete slabs - Crack propagation - Creep - Mathematical models - Reinforced concrete - Shrinkage - Steel beams and girders - Structural analysis - Structural loads;

D O I：

10.1061/(ASCE)0733-9445(1995)121:2(319)

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

An analytical model of the behavior of continuous composite beams under sustained service loads is described. Each beam consists of a rolled or fabricated steel I-section acting compositely with a reinforced concrete slab attached to the top flange. The analysis accounts for cracking of the concrete slab in the negative moment regions at each interior support, as well as the time-dependent deformation caused by creep and shrinkage in the concrete slab. Measurements from a series of full-scale continuous composite beams, which were tested by the writers in a separate study for a period of 340 days under sustained uniformly distributed loads, are used to validate the theoretical model. Close agreement is observed between analytical and experimental results. Finally, the analytical model is used to investigate the effects of material nonlinearity on structural behavior.

引用

页码：319 / 327

页数：9

共 10 条

[1] Bazant Z.P., Prediction of concrete creep effects using age-adjusted effective modulus method, ACI J., 69, pp. 212-217, (1972)
[2] Deflections of composite beams subject to creep and shrinkage, ACI Sinta. J, 88, 5, pp. 610-615, (1991)
[3] Bradford M.A., Gilbert R.I., Nonlinear behavior of composite beams at service loads, The Struct. Engr, 67, 14, pp. 263-268, (1989)
[4] Bradford M.A., Gilbert R.I., Time-dependent behaviour of simply-supported composite beams, Proc, 2Nd Nat. Struct. Engrg. Conf, Ieaust, pp. 191-195, (1990)
[5] Bradford M.A., Gilbert R.I., Experiments on composite tee-beams at service loads, Civ. Engrg. Trans.. Ieaust, 33, 4, pp. 285-291, (1991)
[6] Bradford M.A., Gilbert R.I., Composite beams with partial interaction under sustained loads, J. Struct. Engrg., ASCE, 118, 7, (1992)
[7] Bradford M.A., Johnson R.P., Inelastic buckling of composite bridge girders near internal supports, Proc, Instn. of Civ. Engrs., London, England, Part 2, 83, pp. 143-159, (1987)
[8] Gilbert R.I., Time Effects in Concrete Structures, (1988)
[9] Gilbert R.I., Bradford M.A., Time-dependent behavior of continuous composite beams, UNICIV Rep. R-307, School of Civ. Engrg, (1992)
[10] Trost H., Auswirkungen des Superpositionsprinzips auf Kriech- und Relaxations- Probleme bci Beton and Spannbeton, Beton-Und Strahlbetonbau, Germany, 62, 10-11, pp. 230-269, (1967)

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