Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experimental Investigations of Reinforced Concrete Columns with Lap-Spliced Crossties Under Cyclic Axial and Lateral Load
The lap-spliced crosstie is formed by lapping two J-shaped reinforcing bars with a 180° hook at one end and a straight line at the other end, which can address the difficulty and poor construction quality of conventional crossties. This study conducted cyclic lateral load testing of four large reinforced concrete (RC) columns to explore the seismic performance of RC columns with lap-spliced crossties under cyclic axial force. The results are as follows: (1) Under the action of cyclic axial force, all the specimens basically fulfilled the requirements of earthquake-resistant structures under axial compression. The flexural ductility of the specimen with crossties of 180-deg hooks was the best, followed by the specimens using lap-spliced crossties. The specimen with conventional crossties performed the worst. (2) The seismic performance for all the specimens in enduring axial tension was more satisfactory than that for axial compression. (3) When an inner column endures only axial compression during an earthquake with a column axial force ratio of greater than 30%, the use of lap-spliced crossties both meets specification requirements and can facilitate the construction process. (4) When an outer column is subjected to cyclic axial compression and tension during earthquakes, the column axial force ratio is generally less than 30%. Therefore, lap-spliced crossties can be used to replace conventional crossties. (5) For columns that withstand only axial compression, when the column axial force ratio is less than 30%, lap-spliced crossties can be used instead of conventional crossties. (6) RC columns with lap-spliced crossties enclosing lapped longitudinal reinforcements as well as the rectangular column section and intermediate longitudinal reinforcements merit further research and clarification.
Experimental Investigations of Reinforced Concrete Columns with Lap-Spliced Crossties Under Cyclic Axial and Lateral Load
The lap-spliced crosstie is formed by lapping two J-shaped reinforcing bars with a 180° hook at one end and a straight line at the other end, which can address the difficulty and poor construction quality of conventional crossties. This study conducted cyclic lateral load testing of four large reinforced concrete (RC) columns to explore the seismic performance of RC columns with lap-spliced crossties under cyclic axial force. The results are as follows: (1) Under the action of cyclic axial force, all the specimens basically fulfilled the requirements of earthquake-resistant structures under axial compression. The flexural ductility of the specimen with crossties of 180-deg hooks was the best, followed by the specimens using lap-spliced crossties. The specimen with conventional crossties performed the worst. (2) The seismic performance for all the specimens in enduring axial tension was more satisfactory than that for axial compression. (3) When an inner column endures only axial compression during an earthquake with a column axial force ratio of greater than 30%, the use of lap-spliced crossties both meets specification requirements and can facilitate the construction process. (4) When an outer column is subjected to cyclic axial compression and tension during earthquakes, the column axial force ratio is generally less than 30%. Therefore, lap-spliced crossties can be used to replace conventional crossties. (5) For columns that withstand only axial compression, when the column axial force ratio is less than 30%, lap-spliced crossties can be used instead of conventional crossties. (6) RC columns with lap-spliced crossties enclosing lapped longitudinal reinforcements as well as the rectangular column section and intermediate longitudinal reinforcements merit further research and clarification.
Experimental Investigations of Reinforced Concrete Columns with Lap-Spliced Crossties Under Cyclic Axial and Lateral Load
Lee, Tai-KuangDr, Associate Researcher (Autor:in) / Chen, Cheng-ChengProf. (Autor:in)
Structural Engineering International ; 34 ; 128-140
02.01.2024
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
On lap splice length of lap-spliced crossties for reinforced concrete columns under cyclic loading
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