Experimental study on seismic behavior of precast concrete beam-column joints using UHPC-based connections
| Autor: | Jiazheng Song, Xinyu Hu, Weichen Xue |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry Rebar Building and Construction Structural engineering law.invention Splice joint Flexural strength law Precast concrete Architecture Bearing capacity Restoring force Safety Risk Reliability and Quality business Joint (geology) Beam (structure) Civil and Structural Engineering |
| Zdroj: | Structures. 34:4867-4881 |
| ISSN: | 2352-0124 |
| DOI: | 10.1016/j.istruc.2021.10.067 |
| Popis: | Ultra-high performance concrete (UHPC) with high bond characteristics with reinforcing bars could significantly shorten the lap splice length of rebars. UHPC-based rebar lap splice connections offer larger tolerance and simpler operation than traditional rebar connection approaches, which could ease and accelerate the on-site construction process of precast concrete structures. This paper characterizes the seismic behavior of precast beam-column joints where the longitudinal rebars of columns are connected using UHPC with a lap length of 15 times rebar diameter (15db). Full-scaled cyclic tests on two precast joints and two corresponding monolithic joints to compare were carried out keeping a high axial compression ratio (n) at 0.5. It was demonstrated that the beam-column subassemblies failed characterized by flexural failure of beam end instead of the column or joint core. The arch-like load–displacement curves and stable hysteretic behavior were still captured considering the p-delta effect. The proposed precast beam-column joints with UHPC-based connections could achieve similar bearing capacity, ductility and stiffness degradation rule to the monolithic counterparts. The degenerated four-linear restoring force model was presented and verified. Moreover, the numerical simulation was also performed, and the predicted structural behavior was in agreement with the experimental results. |
| Databáze: | OpenAIRE |
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