الفهرس 
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Abstract
RC shear walls are considered one of the main lateral resisting members in buildings. Many RC shear walls all over the world are suffering damages from previous earthquakes or have poor detailing in design or have construction faults, and are in urgent need for rehabilitation. This study aims to investigate experimentally the effectiveness of UHPFRC layers/jacket for strengthening shear-deficient squat RC shear walls subjected to cyclic loading. For this purpose, five identical shear-deficient RC shear walls are constructed, and four of them are strengthened with UHPFRC layers/ jackets. The walls are subjected to a reversed cyclic lateral loading under a constant compressive axial load. The failure process, hysteretic response, ductility index, and energy dissipation capacity are investigated. Moreover, effect of the construction joint at footing-UHPFRC jacket interface on seismic performance is investigated. Additionally, numerical models are developed to simulate the response of tested walls, and parametric studies of crucial parameters of the examined techniques and the construction joint have been investigated numerically. These parameters include the roughness surface level, number of shear connectors, different UHPFRC jackets‟ thickness, using normal strength concrete jacket, strengthening with reinforced UHPFRC using steel mesh (R-UHPFRC) jackets with various reinforcement ratio, size effect, and using additional boundary vertical reinforcing bars were implemented. Also, a comparison with the outcomes 241 of numerical analysis of RC shear wall strengthened by external CFRP sheets is conducted. Finally, new analytical models are suggested for predicting the shear and flexural strength capacities of UHPFRC strengthened walls, and its efficiency verified with experimental results.