Experimental study on cyclic behavior of post-tensioned segmental retaining walls (PSRWs)
| Autor: | Md. Mizanur Rahman, M. R. Karim, Mehdi Javadi, Reza Hassanli |
|---|---|
| Přispěvatelé: | Javadi, Mehdi, Hassanli, Reza, Rahman, Md Mizanur, Karim, Md Rajibul |
| Rok vydání: | 2021 |
| Předmět: |
Carbon fiber reinforced polymer
Materials science precast retaining wall 0211 other engineering and technologies Stiffness 020101 civil engineering 02 engineering and technology Compression (physics) Retaining wall retaining wall 0201 civil engineering unbonded post-tensioning accelerated construction Precast concrete 021105 building & construction Ultimate tensile strength medicine T-shaped walls Cylinder stress medicine.symptom Composite material Ductility segmental wall rubberized concrete Civil and Structural Engineering |
| Zdroj: | Engineering Structures. 229:111619 |
| ISSN: | 0141-0296 |
| DOI: | 10.1016/j.engstruct.2020.111619 |
| Popis: | This paper reports on an experimental study on nine Post-tensioned Segmental Retaining Walls (PSRWs). All the walls were post-tensioned and tested under incrementally increasing cyclic loading. Each test wall was constructed using four T-shaped precast concrete blocks, assembled on top of each other with dry joints. The integrity of the system was maintained using post-tensioning (PT). Different levels of PT forces were applied to investigate the effect of it. Different wall-footing interface materials were used including steel plate, concrete and neoprene pad. Conventional concrete and crumb rubberized concrete was used to investigate the effect of concrete properties on the structural behavior of retaining walls. Three walls with confinement (confined with either Carbon Fiber Reinforced Polymer (CFRP), steel reinforcement or steel face plate) were tested. The force–displacement responses, energy dissipation, post-tensioning stresses, gap rotation, lateral stiffness, and normal strains were observed and compared. The results from this study showed that the level of axial stress ratio, eccentricity of pre-stressing as well as the properties of the wall-footing interface material is critical to provide enough lateral strength and stiffness for engineering design of the PSRW. The wall with steel plate on compression face had the largest ultimate strength. The specimen having largest PT force generated largest initial and secant stiffness. Additional reinforcement of the bottom most segment is also required to avoid sudden failure and increase ductility in T-shaped blocks. Lateral stiffness increases in conventional concrete was much higher than rubberized concrete when PT force was increased. None of concrete confinement methods applied (CFRP confinement, steel reinforcement and steel face plate) affected energy dissipation characteristics of the tested walls. Using neoprene as the interface material for wall-footing significantly increased energy dissipation and concrete wall-footing interface showed more energy dissipation in comparison to steel interface material.Stiffness degradation of all walls had similar rate against wall lateral displacement. This paper concluded that the proposed segmental retaining wall system is potentially a practical alternative to accelerate the construction of retaining walls using precast concrete blocks. Refereed/Peer-reviewed |
| Databáze: | OpenAIRE |
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