Journal of the mechanical behavior of materials: Experimental study on the structural behavior of concrete-encased steel circular and square tube beams filled with mortar

Fadhel, Muhaned Hassan; Al-Saraj, Wissam Kadhum

Experimental study on the structural behavior of concrete-encased steel circular and square tube beams filled with mortar / Fadhel, Muhaned Hassan (CC BY)

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fullscreen : Experimental study on the structural behavior of concrete-encased steel circular and square tube beams filled with mortar / Fadhel, Muhaned Hassan (CC BY)

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CC BY: Attribution 4.0 International. You can find more information here.

Periodical

Title:: Journal of the mechanical behavior of materials

Publication:: Berlin: de Gruyter

Note:: Gesehen am 24.01.2019; Open Access; Namensnennung 4.0 International

ISSN:: 2191-0243

ZDB-ID:: 2602431-7

VÖBB-Katalog:: 35283926

Keywords:: Zeitschrift

Classification:: Naturwissenschaften

Collection:: Naturwissenschaften

Copyright:: Rights reserved

Accessibility:: Free Access

Title:: Journal of the mechanical behavior of materials

Publication:: Berlin: de Gruyter

Note:: Gesehen am 24.01.2019; Open Access; Namensnennung 4.0 International

ISSN:: 2191-0243

ZDB-ID:: 2602431-7

VÖBB-Katalog:: 35283926

Keywords:: Zeitschrift

Classification:: Naturwissenschaften

Collection:: Naturwissenschaften

Copyright:: Rights reserved

Accessibility:: Free Access

Article

Author:: Fadhel, Muhaned Hassan; Al-Saraj, Wissam Kadhum

Title:: Experimental study on the structural behavior of concrete-encased steel circular and square tube beams filled with mortar

Publication:: Berlin: de Gruyter, 2026

Language:: English

Information:: Abstract: This study experimentally investigates the flexural behavior of concrete-encased steel tube (STFC) beams with varying tube geometries and infill conditions. Five simply supported beams were tested under two-point loading: one reference beam reinforced with conventional steel bars, two beams with circular steel tubes (one filled with 55 MPa mortar, one empty), and two beams with square steel tubes (one filled with 55 MPa mortar, one empty). All beams were cast using concrete with a compressive strength of 35 MPa. The reference beam achieved the highest ultimate load of 151 kN and a stiffness of 21.27 kN/mm. STFC beams exhibited a 7.3–21.9 % reduction in ultimate load but displayed significantly enhanced ductility, with the ductility index increasing from 2.06 (reference) to 3.06 (empty circular tube), and energy absorption rising from 725.4 kNmm to 1,120.8 kN mm. Beams with square tubes reinforcement outperformed ones with circular tubes reinforcement in load capacity and stiffness due to improved interaction and composite action with the surrounding concrete. Additionally, mortar infill effectively increased stiffness, stabilized thin-walled tubes against local buckling, and improved strain compatibility between steel and concrete. These results demonstrate that while conventional reinforcement exhibited the highest strength, STFC beams offer a superior combination of ductility, toughness, and post-yield deformation, making them highly suitable for seismic-resistant structures and applications requiring high deformation capacity.

Scope:: Online-Ressource

Note:: Open Access; Archivierung/Langzeitarchivierung gewährleistet

Keywords:: concrete-encased steel tubes ; STFC beams ; flexural behavior ; ductility ; composite action

Classification:: Naturwissenschaften; Technik

DDC Group:: 620 Ingenieurwissenschaften

URN:: urn:nbn:de:101:1-2607230335423.879951643688

Collection:: Naturwissenschaften; Technik

Copyright:: CC BY

Accessibility:: Free Access

Author:: Fadhel, Muhaned Hassan; Al-Saraj, Wissam Kadhum

Title:: Experimental study on the structural behavior of concrete-encased steel circular and square tube beams filled with mortar

Publication:: Berlin: de Gruyter, 2026

Language:: English

Information:: Abstract: This study experimentally investigates the flexural behavior of concrete-encased steel tube (STFC) beams with varying tube geometries and infill conditions. Five simply supported beams were tested under two-point loading: one reference beam reinforced with conventional steel bars, two beams with circular steel tubes (one filled with 55 MPa mortar, one empty), and two beams with square steel tubes (one filled with 55 MPa mortar, one empty). All beams were cast using concrete with a compressive strength of 35 MPa. The reference beam achieved the highest ultimate load of 151 kN and a stiffness of 21.27 kN/mm. STFC beams exhibited a 7.3–21.9 % reduction in ultimate load but displayed significantly enhanced ductility, with the ductility index increasing from 2.06 (reference) to 3.06 (empty circular tube), and energy absorption rising from 725.4 kNmm to 1,120.8 kN mm. Beams with square tubes reinforcement outperformed ones with circular tubes reinforcement in load capacity and stiffness due to improved interaction and composite action with the surrounding concrete. Additionally, mortar infill effectively increased stiffness, stabilized thin-walled tubes against local buckling, and improved strain compatibility between steel and concrete. These results demonstrate that while conventional reinforcement exhibited the highest strength, STFC beams offer a superior combination of ductility, toughness, and post-yield deformation, making them highly suitable for seismic-resistant structures and applications requiring high deformation capacity.

Scope:: Online-Ressource

Note:: Open Access; Archivierung/Langzeitarchivierung gewährleistet

Keywords:: concrete-encased steel tubes ; STFC beams ; flexural behavior ; ductility ; composite action

Classification:: Naturwissenschaften; Technik

DDC Group:: 620 Ingenieurwissenschaften

URN:: urn:nbn:de:101:1-2607230335423.879951643688

Collection:: Naturwissenschaften; Technik

Copyright:: CC BY

Accessibility:: Free Access

Full text

==... 5
Drum lebt er auch nach seinem Tode
fort,
Und ist so wirksam, als er lebte.
Die gute That, das schöne Wort,
Es strebt unsterblich, wie er sterblich
strebte,
So lebst auß Du durch ungemessene
Zeit ==Genjeße
 der Unsterblichkeit?

78

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