This paper investigates the strength and deformation characteristics of reinforced normal and high-strength concrete rectangular beams which failed in shear and repaired by external bonding of carbon fiber and steel p...This paper investigates the strength and deformation characteristics of reinforced normal and high-strength concrete rectangular beams which failed in shear and repaired by external bonding of carbon fiber and steel plate. Five simply supported reinforced concrete beams with shear reinforcement are tested, three of which are made with NSC （normal-strength concrete） and the other two with HSC （high-strength concrete）. The span of the simply supported beams is 0.9 m with 100 mm wide by 200 mm deep cross section. All five beams are tested under four-point bending. Careful repair process is adopted and proved successful. The aim is to restore or increase shear strength of these beams and to monitor their post-repair load-deflection behavior. The effect of concrete compressive strength on the behavior and strength of beams before and after repair is also investigated. Shear cracks patterns and their evolution are observed and discussed.展开更多
In order to comply with the trend of global climate change,countries are gradually promoting energy conservation and emission reduction,and prefabricated buildings have become one of the main paths for the constructio...In order to comply with the trend of global climate change,countries are gradually promoting energy conservation and emission reduction,and prefabricated buildings have become one of the main paths for the construction industry to develop towards carbon peaking and carbon neutrality goals.This paper takes the box-shaped column flange connection achieved by plug welding-core sleeve in the dormitory building of Tongzhou Campus of the Affiliated High School of Capital Normal University in China as the research object.Based on the consumption quota of prefabricated construction projects and the actual project quantity,the carbon emissions of steel structure column connection joints at different phases are calculated by the emission factor method,and it is proposed that the production consumption of building materials plays a key role in energy conservation and emission reduction.This paper concludes that the box-shaped column flange connection achieved by plug welding-core sleeve in the construction phase of an assembled steel building emits 49.5%less carbon dioxide than a conventional full fusion-welded joint.And the reason for the high carbon emissions of the latter is mainly from the amount of materials and machinery required for full penetration welding.It further affirms the green and environmental protection effect of the assembled steel structure plug welding-core sleeve flange connection joint in actual projects,and provides a reference for related research.展开更多
文摘This paper investigates the strength and deformation characteristics of reinforced normal and high-strength concrete rectangular beams which failed in shear and repaired by external bonding of carbon fiber and steel plate. Five simply supported reinforced concrete beams with shear reinforcement are tested, three of which are made with NSC （normal-strength concrete） and the other two with HSC （high-strength concrete）. The span of the simply supported beams is 0.9 m with 100 mm wide by 200 mm deep cross section. All five beams are tested under four-point bending. Careful repair process is adopted and proved successful. The aim is to restore or increase shear strength of these beams and to monitor their post-repair load-deflection behavior. The effect of concrete compressive strength on the behavior and strength of beams before and after repair is also investigated. Shear cracks patterns and their evolution are observed and discussed.
基金funded by National Natural Science Foundation of China,grant number 51778036Joint Program of Beijing Natural Science Foundation and Education Commission,grant number KZ201910016018.
文摘In order to comply with the trend of global climate change,countries are gradually promoting energy conservation and emission reduction,and prefabricated buildings have become one of the main paths for the construction industry to develop towards carbon peaking and carbon neutrality goals.This paper takes the box-shaped column flange connection achieved by plug welding-core sleeve in the dormitory building of Tongzhou Campus of the Affiliated High School of Capital Normal University in China as the research object.Based on the consumption quota of prefabricated construction projects and the actual project quantity,the carbon emissions of steel structure column connection joints at different phases are calculated by the emission factor method,and it is proposed that the production consumption of building materials plays a key role in energy conservation and emission reduction.This paper concludes that the box-shaped column flange connection achieved by plug welding-core sleeve in the construction phase of an assembled steel building emits 49.5%less carbon dioxide than a conventional full fusion-welded joint.And the reason for the high carbon emissions of the latter is mainly from the amount of materials and machinery required for full penetration welding.It further affirms the green and environmental protection effect of the assembled steel structure plug welding-core sleeve flange connection joint in actual projects,and provides a reference for related research.
