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A platform for research: civil engineering, architecture and urbanism
Improving the mechanical characteristics of semi-rigid saddle connections
Abstract There are many steel structures in Iran with semi-rigid saddle connections. It has been observed that, during a strong earthquake, this type of connection can experience a premature fracture, which will endanger the stability of the structure. The present study endeavored to improve the mechanical characteristics including the initial stiffness, yield moment, maximum moment, crack rotation, and load transfer mechanisms of the conventional saddle connections using retrofitting methods. An experimental study was conducted on six full-scale specimens to study the effect of the retrofitting methods on the stiffness, yield moment, and maximum moment of the connection and for the prevention of premature fracture. A numerical study including 88 high-fidelity finite element models was conducted to further evaluate two selected retrofitting methods. Using the generated database, predictive expressions have been proposed for calculating the initial stiffness, yield moment, and crack rotation. The proposed retrofitting methods were shown to improve the mechanical characteristics of conventional saddle connections.
Graphical abstract Display Omitted
Highlights Many existing structures with saddle connections vulnerable to premature fracture. Evaluating five retrofit methods experimentally and numerically. Studying initial stiffness, yield and maximum moments, transfer mechanism and fracture. Improving mechanical characteristics and preventing premature fracture by retrofitting. Proposing predictive expressions for calculating mechanical characteristics.
Improving the mechanical characteristics of semi-rigid saddle connections
Abstract There are many steel structures in Iran with semi-rigid saddle connections. It has been observed that, during a strong earthquake, this type of connection can experience a premature fracture, which will endanger the stability of the structure. The present study endeavored to improve the mechanical characteristics including the initial stiffness, yield moment, maximum moment, crack rotation, and load transfer mechanisms of the conventional saddle connections using retrofitting methods. An experimental study was conducted on six full-scale specimens to study the effect of the retrofitting methods on the stiffness, yield moment, and maximum moment of the connection and for the prevention of premature fracture. A numerical study including 88 high-fidelity finite element models was conducted to further evaluate two selected retrofitting methods. Using the generated database, predictive expressions have been proposed for calculating the initial stiffness, yield moment, and crack rotation. The proposed retrofitting methods were shown to improve the mechanical characteristics of conventional saddle connections.
Graphical abstract Display Omitted
Highlights Many existing structures with saddle connections vulnerable to premature fracture. Evaluating five retrofit methods experimentally and numerically. Studying initial stiffness, yield and maximum moments, transfer mechanism and fracture. Improving mechanical characteristics and preventing premature fracture by retrofitting. Proposing predictive expressions for calculating mechanical characteristics.
Improving the mechanical characteristics of semi-rigid saddle connections
Moghaddam, Hassan (author) / Sadrara, Ali (author)
2021-08-12
Article (Journal)
Electronic Resource
English
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