Studies on Sleeved Composite Columns for Seismic Resistant Industrial Structures
Abstract
Studies On Sleeved Composite Columns For Seismic Ressistant Industrial Structures The test results indicated that the failure modes of the prefabricated columns and the cast-in-situ columns are basically identical, but differences exist in their crack distribution.
The cast-in-situ columns mainly crack horizontally at the bottom of the column, whereas the prefabricated columns have horizontal cracks above the sleeves, then form diagonal cracks downwards and develop many wider cracks within the height range of 300 mm at the bottom of the column. The hysteresis curves of the prefabricated columns are plump, which shows that prefabricated columns have satisfactory energy-dissipating capacity.
In addition, the stiffness degradation of the prefabricated specimens is slower than that of cast-in-situ specimens. The ultimate displacement angle of the prefabricated columns is up to 1/104-1/54, which meets the inter-story drift ratio requirements during major earthquakes.
These composite columns have the rigidity and formability of reinforced concrete with the strength and speed of construction associated with the structure, making them economical. As a result, compression forces (CF) act on the core and bending moment (BM) on the sleeve, isolating the BM and CF.
Research studies in seismic regions are still underway to assess the application of GSS connections as part of the Accelerated Bridge Construction (ABC) initiative. In this study, a summary of experimental results is provided from half-scale experiments of ABC columns under cyclic quasistatic loading, addressing performance differences between GSS and cast-in-place monolithic connections
It was found that the global strength of cast-in-place and precast column models is similar. For the precast alternative bar fracture occurred in fewer cycles, the ultimate displacement was comparable and the displacement ductility was lower than the cast-in-lace models.
Conclusion
The objective was to ascertain the applicability of the proposed model with grouted splice sleeve connectors for both cast-in-place monolithic columns and precast bridge columns. Furthermore, the effect on structural response of varying parameters was investigated.
