• Structural Engineering and Mechanics
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• v.91 no.2
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• pp.149-161
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• 2024

In the world, the construction science and technology industry has developed strongly thanks to the application of Ultra-High Performance Concrete (UHPC) technology, with a strength greater than 150 Mpa and unprecedented durability. compared to previous materials. However, this technology can build special structures but has limited use in construction because it is not commercially feasible to replace regular concrete in most structural types due to material costs. high, lack of availability, limited design standards, complex manufacturing and maintenance techniques. This article examines the composition of UHPC materials and their performance in composite structures with conventional concrete, a promising choice for promoting the development of UHPC technology in construction. It is based on the combined use of UHPC as a covering layer around normal concrete or as an inner core to increase the strength of normal concrete, create a slender structure and reduce the cost and repair of construction works. Construction and transport infrastructure are degraded. Manufacturing costs are expected to be reduced with composite construction due to the advantages of combined materials.

• Steel and Composite Structures
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• v.53 no.4
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• pp.421-434
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• 2024

In order to study the seismic performance of the damaged steel concrete special-shaped beam-column joints reinforced by manually compacted ultra-high performance concrete (UHPC), cyclic hysteresis loading tests were carried on two profiled concrete beam-column joint specimens before and after the reinforcement. The failure mode, load carrying capacity, deformation, hysteresis curves, skeleton curves, strength degradation, stiffness degradation, and energy dissipation capacity of the specimens were compared before and after reinforcement. The results show that the bonding performance between UHPC material and ordinary concrete was very good. After UHPC reinforcement, the bearing capacity of the damaged joints can be basically restored to the intact state, and the energy-consuming capacity increased, but the stiffness degradation was obvious. It is recommended that when using UHPC for joint reinforcement, the effect of forming ring wrap in the joint area is better. The research conclusion can provide reference for the design and popularization of UHPC and has certain theoretical and practical value.