This study examines the application of Ultra-High Performance Concrete (UHPC) in precast beam-column joints to improve structural performance. The studied joints included both adequately and inadequately reinforced co...
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This study examines the application of Ultra-High Performance Concrete (UHPC) in precast beam-column joints to improve structural performance. The studied joints included both adequately and inadequately reinforced conditions (strong and weak joints), constructed using UHPC and deformed rebars. The strong joints allowed the rebars to reach their yield strength under the design bending moment, effectively transferring loads and maintaining structural integrity during service conditions. These well-detailed joints exhibited ductile failure behavior, which is a desired characteristic in reinforced concrete design. In contrast, the weak joints experienced premature and brittle failures, underscoring the importance of proper detailing and reinforcement length. Finally, a practical design scheme was developed to determine the appropriate rebar lengths in UHPC connections to ensure structural integrity and safety. Overall, the integration of UHPC into precast concrete joints significantly enhanced bond performance, improved load transfer mechanisms, and contributed to more resilient and reliable construction practices.
Steel production is considered one of the most material and energy-consuming industries, and using less energy is considered vital to promote environmental sustainability. Steel is used as the main building material i...
Steel production is considered one of the most material and energy-consuming industries, and using less energy is considered vital to promote environmental sustainability. Steel is used as the main building material in the construction of factories, hangars, and workshops in the form of trusses. A truss system is a set of structural elements connected at pin joints , with different types, shapes, and weights. Optimizing truss systems for max strength and minimum weight is a sustainable approach to reducing steel production and promoting environmental sustainability. In this paper 27 Pratt trusses were optimized by trial and error using finite element analysis (FEM) to predict the optimum topology for various cross-sections. Correlations between the span length, cross-sectional area, and height of the trusses were developed to conclude the ideal topology of the Pratt truss that gives minimum compression and tension stresses. The effect of topology on the reaction forces was also addressed. Results showed that the optimum horizontal span length between joints ranged between 3.4 and 3.6 m for minimal compressive stresses and minimum horizontal and vertical reaction forces at supports, and from 3.0 to 3.6 m for minimal tensile stresses .
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