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Application of stainless-steel wire mesh (SSWM) for strengthening reinforced concrete beam-column junction

By: Contributor(s): Publication details: Thane ACC LTD 2024Edition: Vol.98(6), JunDescription: 44-59pSubject(s): Online resources: In: Indian Concrete Journal - ICJSummary: The transfer of external loads from their source to the foundation is highly dependent on the connections present between loadbearing components within reinforced concrete (RC) structures. The reinforcement detailing at the junctions ensure proper transfer of forces and moments from one structural member to other structural member and maintain integrity of structural system. Inadequate design and detailing of connections between beam and column in framed structure cause safety hazard under the effect of lateral loading. To strengthen beamcolumn junctions in RC frame structures, jacketing of Fiber reinforced Polymer (FRP) materials is carried out but debonding of FRP materials from the surface of concrete often leads to the underutilization for strength of the FRP in many scenarios. The high cost of FRP materials, their tendency for brittle failure, and the occurrence of debonding have prompted the search for alternative materials to strengthen structural elements and connections. In the present study application of stainless-steel wire mesh (SSWM) for strengthening of RC beam-column junctions is evaluated. Specimens of beam column junctions are strengthened by bonding SSWM 40×32 in two different configurations. In one configuration, L-shaped SSWM strips are applied at two corners with enclosure of SSWM strip box while in other configuration, L-shaped SSWM strips at corners are enclosed by 45° SSWM strips from both the sides of specimen. To bond the SSWM onto the concrete surface of the beamcolumn junction, epoxy SIKADUR 30LP is utilized. One control and two SSWM strengthened specimens are subjected to monotonic load in vertical downward direction. From the loaddisplacement behaviour of specimens’ strength and ductility are compared. From the present experimental investigation, it is observed that SSWM strengthened specimens carry 14 % to 15 % higher ultimate load in comparison of control specimen. Strengthened specimens also exhibit improvement in energy absorption and ductility. Based on outcome of present study, it is recommended to use SSWM for strengthening of RC beamcolumn junctions.
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The transfer of external loads from their source to the foundation is highly dependent on the connections present between loadbearing components within reinforced concrete (RC) structures. The reinforcement detailing at the junctions ensure proper transfer of forces and moments from one structural member to other structural member and maintain integrity of structural system. Inadequate design and detailing of connections between beam and column in framed structure cause safety hazard under the effect of lateral loading. To strengthen beamcolumn junctions in RC frame structures, jacketing of Fiber reinforced Polymer (FRP) materials is carried out but debonding of FRP materials from the surface of concrete often leads to the underutilization for strength of the FRP in many scenarios. The high cost of FRP materials, their tendency for brittle failure, and the occurrence of debonding have prompted the search for alternative materials to strengthen structural elements and connections. In the present study application of stainless-steel wire mesh (SSWM) for strengthening of RC beam-column junctions is evaluated. Specimens of beam column junctions are strengthened by bonding SSWM 40×32 in two different configurations. In one configuration, L-shaped SSWM strips are applied at two corners with enclosure of SSWM strip box while in other configuration, L-shaped SSWM strips at corners are enclosed by 45° SSWM strips from both the sides of specimen. To bond the SSWM onto the concrete surface of the beamcolumn junction, epoxy SIKADUR 30LP is utilized. One control and two SSWM strengthened specimens are subjected to monotonic load in vertical downward direction. From the loaddisplacement behaviour of specimens’ strength and ductility are compared. From the present experimental investigation, it is observed that SSWM strengthened specimens carry 14 % to 15 % higher ultimate load in comparison of control specimen. Strengthened specimens also exhibit improvement in energy absorption and ductility. Based on outcome of present study, it is recommended to use SSWM for strengthening of RC beamcolumn junctions.

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