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Low cycle fatigue behavior of constraint connections
Abstract The influence of microstructure and material properties on reverse low-cycle fatigue performance has been investigated using small-scale test specimens with different constraint severities. The steel specimens were heat-treated to produce microstructures similar to the fusion line in welded steel moment resisting frames (SMRFs) with various yield strengths and toughness values. The reverse cyclic tests revealed that toughness has almost no influence on the cyclic performance if the steel is constraint. A performance enhancing material parameter, on the other hand, for mostly crack initiation controlled cyclic resistance, is high yield strength. High yield strength reduces the corresponding local strains at the notch tip, unless high nominal stresses cause an early ductile crack initiation, which results in poor cyclic resistance regardless of material properties and amount of constraint. While high toughness is still important to enhance the fracture strength in order to accommodate the maximum imposed stresses/strains in earthquake loading, high yield strength plays the key role in the general cyclic performance below this critical value. This in general applies to different structural steels as well as microstructural changes due to welding procedures in SMRFs. Material properties that are required to resist fracture are different from material properties that enhance cyclic performance of constraint connections.
Low cycle fatigue behavior of constraint connections
Abstract The influence of microstructure and material properties on reverse low-cycle fatigue performance has been investigated using small-scale test specimens with different constraint severities. The steel specimens were heat-treated to produce microstructures similar to the fusion line in welded steel moment resisting frames (SMRFs) with various yield strengths and toughness values. The reverse cyclic tests revealed that toughness has almost no influence on the cyclic performance if the steel is constraint. A performance enhancing material parameter, on the other hand, for mostly crack initiation controlled cyclic resistance, is high yield strength. High yield strength reduces the corresponding local strains at the notch tip, unless high nominal stresses cause an early ductile crack initiation, which results in poor cyclic resistance regardless of material properties and amount of constraint. While high toughness is still important to enhance the fracture strength in order to accommodate the maximum imposed stresses/strains in earthquake loading, high yield strength plays the key role in the general cyclic performance below this critical value. This in general applies to different structural steels as well as microstructural changes due to welding procedures in SMRFs. Material properties that are required to resist fracture are different from material properties that enhance cyclic performance of constraint connections.
Low cycle fatigue behavior of constraint connections
Rosien, F. J. (author) / Ostertag, C. P. (author)
2008
Article (Journal)
Electronic Resource
English
Low cycle fatigue behavior of constraint connections
| British Library Online Contents | 2009
Low cycle fatigue behavior of constraint connections
| Online Contents | 2008
Low cycle fatigue behavior of constraint connections
| Online Contents | 2008
Low cycle fatigue behavior of constraint connections
| Springer Verlag | 2008
Low cycle fatigue behavior of constraint connections
| Springer Verlag | 2008