Topic
Portal frame
About: Portal frame is a research topic. Over the lifetime, 1778 publications have been published within this topic receiving 7210 citations.
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TL;DR: In this article, the authors present a unified optimization approach which combines finite element and linear programming for a portal frame with stress-and displacement-constraint constraints for multiple load cases.
20 citations
TL;DR: In this article, the authors evaluated the in-plane seismic capacity of masonry portal frames, which can be considered the basic structural element in historical buildings, using the limit analysis approach to provide simplified expressions of the horizontal collapse multiplier.
20 citations
TL;DR: In this article, the authors analyzed dynamic localization of damage in structures with softening inelastic hinges and studied implications for the seismic response of reinforced concrete or steel frames of buildings or bridges.
Abstract: This paper analyzes dynamic localization of damage in structures with softening inelastic hinges and studies implications for the seismic response of reinforced concrete or steel frames of buildings or bridges. First, the theory of limit points and bifurcation of the symmetric equilibrium path due to localization of softening damage is reviewed. It is proven that, near the state of static bifurcation or near the static limit point, the primary (symmetric) path of dynamic response or periodic response temporarily develops Liapunov-type dynamic instability such that imperfections representing deviations from the primary path grow exponentially or linearly while damage in the frame localizes into fewer softening hinges. The implication for seismic loading is that the kinetic energy of the structure must be absorbed by fewer hinges, which means faster collapse. The dynamic localizations are demonstrated by exact analytical solutions of torsional rotation of the floor of a symmetric and symmetrically excited frame, and of horizontal shear excitation of a building column. Static bifurcations with localization are also demonstrated for a portal frame, a multibay frame, and a multibay-multistory frame. The widely used simplification of a structure as a single-degree-of-freedom oscillator becomes invalid after the static bifurcation state is passed.
19 citations
TL;DR: In this article, simple plastic theory is used to investigate the minimum weight design of a rectangular portal frame under various loadings, and two designs under slightly different conditions are made according to the Foulkes theory for frames with prismatic members.
19 citations
TL;DR: In this paper, the authors compared the life cycle costs of a new steel portal frame building system incorporating energy efficient sandwich panels with those of a conventional steel portal-frame building system for use in industrial and commercial buildings.
Abstract: Life cycle costs of a new steel portal frame building system incorporating energy efficient sandwich panels are compared with those of a conventional steel portal frame building system for use in industrial and commercial buildings. The economic benefits of the new building system have been demonstrated through cost assessment of energy in use. The results from life cycle cost analysis of both the new and conventional portal frame building systems indicate that, despite slightly higher initial costs, the new building system costs significantly less than the conventional system over its complete life cycle of 50 years. The new system provides improved economic performance along with a more energy-efficient model for commercial/industrial building design in the Australian climate.
18 citations