Abstract
A steel frame with a semi-rigid connection is one of the most widely used structural systems in modern construction. These systems are cheap to make, require less time to construct and offer the highest quality and reliable construction quality without the need for highly skilled workers. However, these systems show greater natural periods compared to their perfectly rigid frame counterparts. This causes the building to attract low loads during earthquakes. In this research study, the seismic performance of steel frames with semi-rigid joints is evaluated. Three connections with capacities of 50, 70 and 100% of the beam’s plastic moment are studied and examined. The seismic performance of these frames is determined by a non-linear static pushover analysis and an incremental dynamic analysis leading finally to the fragility curves which are developed. The results show that a decrease in the connection capacity increases the probability of reaching or exceeding a particular damage limit state in the frames is found. Doi: 10.28991/cej-2021-03091714 Full Text: PDF
Highlights
The actual behavior of connections is conventionally ignored in steel frame
Unbraced frames are used quite widely in areas affected by strong earthquakes for low and medium height buildings due to their high ductility. They generally provide a good energy dissipation capacity as a result of the hysterical ductile behaviour of the beams elements composing these frames. It is possible for inelastic cyclic deformations to occur in other elements, such as connections . the reputation of steel frames is well established, the vulnerability of unbraced frames became apparent during the powerful El Centro1940, Northridge 1994 and Kobe 1995 earthquakes, through brittle failures detected at the connections beams to columns of the structures [14]
The seismic performance of these frames is determined by a non-linear static pushover analysis and an incremental dynamic analysis leading to the establishment of fragility curves
Summary
The actual behavior of connections is conventionally ignored in steel frame. In reality, structural analysis of steel frames is usually performed assuming that the connections meet the perfect conditions of a pinned or rigid connection. Unbraced frames are used quite widely in areas affected by strong earthquakes for low and medium height buildings due to their high ductility They generally provide a good energy dissipation capacity as a result of the hysterical ductile behaviour of the beams elements composing these frames. It is possible for inelastic cyclic deformations to occur in other elements, such as connections . the reputation of steel frames is well established, the vulnerability of unbraced frames became apparent during the powerful El Centro1940, Northridge 1994 and Kobe 1995 earthquakes, through brittle failures detected at the connections beams to columns of the structures [14]. Aksoylar et al (2011) [17] studied the behaviour of structures with energy dissipation zones in semi-rigid joints designed in high seismicity locations and their seismic response was estimated analytically with various connection capacities. The seismic performance of these frames is determined by a non-linear static pushover analysis and an incremental dynamic analysis leading to the establishment of fragility curves
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