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- Author or Editor: A. Ashraf x
- Materials and Applied Sciences x
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Abstract
Prying force formation at bolts is considered as an important problem in steel connection design. It affects the connection bearing capacity, ductility and serviceability negatively by increasing stresses induced inside connections. In the present work, behavior of steel connection under prying force is studied. A connection of steel beam-column has been modeled using software Revit program. Tension load is applied increasingly and the connection displacement has been measured until failure. Finite element simulation of steel angles under the effect of tension load and prying force has been studied. It is found that the connection has three phases of bearing behavior. Plastic hinge formation noticed increased with prying force presence.
Abstract
The influence of utilizing waste concrete aggregates on the flexural behavior of external reinforced concrete beams has been studied. Seven mixtures were prepared for this investigation where the concrete mixtures had different waste concrete percentages and admixtures. Also, seven beams were modeled by Ansys program and the properties of the seven mixtures have been used in the models to study their effects. It was found that using waste concrete aggregates has decreased the load bearing capacity and concrete ductility. It was found that the beam bearing capacity was decreased by 10.7% when using only waste concrete. Using admixtures have enhanced the concrete properties where the load capacity of beams has been increased by 39% when using silica fume and superplasticizer and the load capacity has increased by 44.6% when multi-admixtures have been used. Besides, it was found that using additives has enhanced the beam ductility significantly.
Abstract
This research investigates the complex interplay between stress impact, concrete shrinkage, and its implications on crack development. Utilizing theoretical and computational methods, the study analyzes the detrimental effects of structural cracks caused by stress variations. A distinctive behavior of long-term shrinkage concerning stress levels was observed. It was found that, positive stress enhances the mean Young's modulus, while negative stress reduces modulus under negative stress conditions, heightened susceptibility to crack propagation under negative stress and improved resistance under positive stress. Temperature's uniform impact on long-term shrinkage is demonstrated, highlighting differences among various cement classes.
