Abstract
Pushover analysis has become an effective tool for seismic design of high-rise buildings under severe earthquakes. However, the applicability of traditional pushover analysis is often questioned for long-span structures due to their complex dynamic characteristics. In this paper, pushover analysis was adopted to determine the seismic behavior of a long-span steel truss structure under severe earthquakes. Load distributions were determined based on the fundamental modes for vertical and horizontal earthquakes respectively. Pushover curves were obtained by nonlinear static analysis. Target displacements were determined with capacity spectrum method. The maximum displacements and plastic hinge distributions determined by traditional pushover analysis agreed well with those by nonlinear time history analysis for both horizontal and vertical earthquake actions. It was then concluded that the seismic behavior of this kind of long-span steel truss structures can be evaluated by traditional pushover analysis accurately enough for practical design purpose.
Highlights
Long-span steel truss structures are widely used in public buildings, such as gymnasium, train stations and conference centers
The position of the plastic hinge is consistent with the result of nonlinear time history analysis, and again the number of plastic hinges obtained by pushover analysis is less than that by Nonlinear time history analysis (NTHA)
Traditional pushover analysis was adopted to determine the seismic behavior of a long-span steel truss structure under vertical and horizontal severe earthquakes respectively
Summary
Long-span steel truss structures are widely used in public buildings, such as gymnasium, train stations and conference centers. Pushover analysis is based on the assumption that the dynamic response of the structure is controlled by the elastic fundamental mode, which is the case for most regular high-rise buildings [15]. Due to their large number of degrees of freedom, long-span steel structures often have densely distributed natural frequencies and complex vibration modes. The maximum displacements and plastic hinge distributions obtained by pushover analysis and NTHA were compared to evaluate the accuracy of traditional pushover analysis for this kind of long-span steel truss structures
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