Fire resistance of reinforced concrete columns

Publisher’s version / Version de l'éditeur:

China Civil Engineering Journal, 26, 6, pp. 25-36, 1992-12

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Fire resistance of reinforced concrete columns

Nan, S.; Lin, T. D.; Lie, T. T.

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Fire re sist a nc e of re inforc e d c onc re t e c olum ns

N R C C - 3 5 9 6 7

N a n , S . ; L i n , T . D . ; L i e , T . T .

D e c e m b e r 1 9 9 2

A version of this document is published in / Une version de ce document se trouve dans:

hina Civil Engineering Journal, 26, (6), pp. 25-36, December-92

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[ 1]

Hull, W .A.and Ingberg, S.H.

1

"Fire Resistance of Concrete

Columns," National Bureau of Standards, Washington, DC

,1925.

[ 2

J ASTM Designation, E

119,

"Standard Methods of Fire Tests

of

Building Construction and Materials" , American Society

for

Testing and Materials, Philadelphia, PA,

1976.

[ 3

J ACI Standard

318,

"Building Code Requirements for

Rein-forced Concrete ( ACI

318-77)" ,

American Concrete Institute,

Detroit, MI,

1977.

[ 4

J

ASTM Standard, C

150-86,

"Specification for Portland

Ce-ment" , American Society for Testing and Materials,

Philadel-phia, PA,

1986,

[ 5

J

Abrams, M.S.and Gustaferro,A.H.: "Fire Endurance of

Con-crete Slabs as lntluenced by Thicknness, Aggregate Type, and

Moisture", Portland Cement Association, R&D Bulletin

:#=223,

I

I

·!

' i

';i

I I

·i

.. 36.

Chicago,

IL,

1968.

( 6] ASTM Designation

1

A615,

"Standard Specification for

De-formed and Plain Billet-Steel Bars :Ior Concrete

Reinforce-ment" , American Society for Testing and Materials,

Philadel-phia, PA,I980.

FIRE RESISTANCE OF REINFORCED CONCRETE COLUMNS Su Nan T .D.Lin

( Jiao Tong University, Taiwan Xinzhu .)

T.T.Lie

(The National Research Council of Canada) Abstract

'l'his paper presents test results including data analyses of 31 concentrically 'loaded columns and 6 eccentrically loaded ones subjected to the stantard ASTM

E-119 fire. The concentrically loaded columns measured s.sm long, and had Bquarejrectangular/ circular cross section with their sides or diameters varied from 203 to 914 mm. The eccentrically loaded columns also measured 3.Bm long, and had square cross sections of 305 x 305 mm.Most columns had a concrete cover ()f 38 mm.Among the six eccentrically loaded columns, four were made with brackets at both ends of the column.Concrete for casting specimens were made with either siliceous, or carbonate, or lightweight aggregate.After a proper -curing, each column specimen was subjected to a concentric load or eccentric ·load during the standard ASTM E-119 fire test. The test results showed that -columns designed in accordance with ACI 318 code requirements and subjected ·flo the maximum allowable load meets the minimum 3 hour fire resistance re-qui•red by the Uniform Building Codes. The data analyses revealed that( 1 >load, .aggregate type, and cross sectional geometry are the maior factors influencing the .fire resistance of the concentrically loaded coiumns1 ( 2 ) load, end

restra-int an.d aggregate type are the major factors affecting the performance of -eccent;rically loaded columns exposed to fires, ( 3 )under the same full service load/the maximum allowable load ratios, the reduction of fire resistance of ·eccentrically loaded columns range from 10 to 58% in compansion with those

ｾ Ｎｦ＠ conce.ntncally loaded columns.

.,