Strength and fire resistance of connections based on glued-in rods

Tuuli Oksanen, Jorma Kangas

Research output: Book/ReportReport

1 Citation (Scopus)

Abstract

A short summary of extensive research on joints of glulam structures based on glued-in ribbed steel rods has been reported. On the basis of research work a calculation method of structures with these connections has been developed and presented. The main concern is on ease of manufacturing and construction as well as fire safety. This paper presents also results of fire resistance tests performed on loaded glulam beams connected together with the joints based on glued-in ribbed steel rods. The tests were carried out at VTT Building Technology, Fire Technology. The structure of the connections was the same in all tests but the thickness of the fire protection and the wood covering of the steel rods were varied in order to achieve fire resistance classes R30, R60 and R90. Rock wool (density 140 kg/m3) covered by steel sheet was used as the fire protection on the bare steel parts of the joint. The test load corresponded 40 % of the design load at the normal temperature design. The furnace temperature was controlled according to the standard ISO 834. The deflection of the beams began to increase remarkably about ten minutes before the failure of the joint. Fire resistance classes of R30, R60 and R90 were achieved with 20 mm, 40 mm and 60 mm thick rock wool fire protection and wood coverings of the steel rods respectively.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages62
ISBN (Electronic)951-38-5754-9
ISBN (Print)951-38-5753-0
Publication statusPublished - 1999
MoE publication typeD4 Published development or research report or study

Publication series

SeriesVTT Tiedotteita - Meddelanden - Research Notes
Number1970
ISSN1235-0605

Fingerprint

Fire resistance
Fire protection
Steel
Wool
Wood
Fires
Rocks
Steel sheet
Furnaces
Temperature

Keywords

  • steel structures
  • joints
  • glulam structures
  • glueing
  • ribbed steel rods
  • strength
  • dimensioning
  • fire resistance
  • fire safety
  • glulam beams
  • wooden structures

Cite this

Oksanen, T., & Kangas, J. (1999). Strength and fire resistance of connections based on glued-in rods. Espoo: VTT Technical Research Centre of Finland. VTT Tiedotteita - Meddelanden - Research Notes, No. 1970
Oksanen, Tuuli ; Kangas, Jorma. / Strength and fire resistance of connections based on glued-in rods. Espoo : VTT Technical Research Centre of Finland, 1999. 62 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 1970).
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abstract = "A short summary of extensive research on joints of glulam structures based on glued-in ribbed steel rods has been reported. On the basis of research work a calculation method of structures with these connections has been developed and presented. The main concern is on ease of manufacturing and construction as well as fire safety. This paper presents also results of fire resistance tests performed on loaded glulam beams connected together with the joints based on glued-in ribbed steel rods. The tests were carried out at VTT Building Technology, Fire Technology. The structure of the connections was the same in all tests but the thickness of the fire protection and the wood covering of the steel rods were varied in order to achieve fire resistance classes R30, R60 and R90. Rock wool (density 140 kg/m3) covered by steel sheet was used as the fire protection on the bare steel parts of the joint. The test load corresponded 40 {\%} of the design load at the normal temperature design. The furnace temperature was controlled according to the standard ISO 834. The deflection of the beams began to increase remarkably about ten minutes before the failure of the joint. Fire resistance classes of R30, R60 and R90 were achieved with 20 mm, 40 mm and 60 mm thick rock wool fire protection and wood coverings of the steel rods respectively.",
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Oksanen, T & Kangas, J 1999, Strength and fire resistance of connections based on glued-in rods. VTT Tiedotteita - Meddelanden - Research Notes, no. 1970, VTT Technical Research Centre of Finland, Espoo.

Strength and fire resistance of connections based on glued-in rods. / Oksanen, Tuuli; Kangas, Jorma.

Espoo : VTT Technical Research Centre of Finland, 1999. 62 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 1970).

Research output: Book/ReportReport

TY - BOOK

T1 - Strength and fire resistance of connections based on glued-in rods

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N1 - Project code: R8SU00113

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N2 - A short summary of extensive research on joints of glulam structures based on glued-in ribbed steel rods has been reported. On the basis of research work a calculation method of structures with these connections has been developed and presented. The main concern is on ease of manufacturing and construction as well as fire safety. This paper presents also results of fire resistance tests performed on loaded glulam beams connected together with the joints based on glued-in ribbed steel rods. The tests were carried out at VTT Building Technology, Fire Technology. The structure of the connections was the same in all tests but the thickness of the fire protection and the wood covering of the steel rods were varied in order to achieve fire resistance classes R30, R60 and R90. Rock wool (density 140 kg/m3) covered by steel sheet was used as the fire protection on the bare steel parts of the joint. The test load corresponded 40 % of the design load at the normal temperature design. The furnace temperature was controlled according to the standard ISO 834. The deflection of the beams began to increase remarkably about ten minutes before the failure of the joint. Fire resistance classes of R30, R60 and R90 were achieved with 20 mm, 40 mm and 60 mm thick rock wool fire protection and wood coverings of the steel rods respectively.

AB - A short summary of extensive research on joints of glulam structures based on glued-in ribbed steel rods has been reported. On the basis of research work a calculation method of structures with these connections has been developed and presented. The main concern is on ease of manufacturing and construction as well as fire safety. This paper presents also results of fire resistance tests performed on loaded glulam beams connected together with the joints based on glued-in ribbed steel rods. The tests were carried out at VTT Building Technology, Fire Technology. The structure of the connections was the same in all tests but the thickness of the fire protection and the wood covering of the steel rods were varied in order to achieve fire resistance classes R30, R60 and R90. Rock wool (density 140 kg/m3) covered by steel sheet was used as the fire protection on the bare steel parts of the joint. The test load corresponded 40 % of the design load at the normal temperature design. The furnace temperature was controlled according to the standard ISO 834. The deflection of the beams began to increase remarkably about ten minutes before the failure of the joint. Fire resistance classes of R30, R60 and R90 were achieved with 20 mm, 40 mm and 60 mm thick rock wool fire protection and wood coverings of the steel rods respectively.

KW - steel structures

KW - joints

KW - glulam structures

KW - glueing

KW - ribbed steel rods

KW - strength

KW - dimensioning

KW - fire resistance

KW - fire safety

KW - glulam beams

KW - wooden structures

M3 - Report

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Oksanen T, Kangas J. Strength and fire resistance of connections based on glued-in rods. Espoo: VTT Technical Research Centre of Finland, 1999. 62 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 1970).