Simultaneous topology, shape (form-finding) and size optimization of steel arched trusses was performed under vertical multi-loading case and seismic action. To bear vertical multi-loading cases, optimum truss arches were optimized by shaping the two chords in order to suitably convert bending moments acting along the truss arch into axial forces in each arched chord, thus allowing to bear highly different multi-loading cases. The chord shape is identified by defining the form of the arched chords through Cubic Rational Bézier curves. Similarly, when considering the seismic action too, two arched chords are still considered, but lying on different planes. For this purpose, the upper chord of the truss arch has been supposed to lie on the horizontal plane, while the lower chord was shaped as an inclined arch. The two arches are connected by a bracing system, thus collaborating to bear the external loading. The horizontal arch primarily resists to the earthquake action that mainly determines its shape, while the vertical loads are transferred to the inclined arch, thus mainly affecting its shape.
Optimum design of an arched truss under vertical and horizontal multi-load cases / Fenu, L.; Marano, G. C.; Congiu, E.; Briseghella, B.. - (2019), pp. 2081-2088. (Intervento presentato al convegno IASS Symposium 2019 - 60th Anniversary Symposium of the International Association for Shell and Spatial Structures; Structural Membranes 2019 - 9th International Conference on Textile Composites and Inflatable Structures, FORM and FORCE tenutosi a esp nel 2019).
Optimum design of an arched truss under vertical and horizontal multi-load cases
Briseghella B.
2019
Abstract
Simultaneous topology, shape (form-finding) and size optimization of steel arched trusses was performed under vertical multi-loading case and seismic action. To bear vertical multi-loading cases, optimum truss arches were optimized by shaping the two chords in order to suitably convert bending moments acting along the truss arch into axial forces in each arched chord, thus allowing to bear highly different multi-loading cases. The chord shape is identified by defining the form of the arched chords through Cubic Rational Bézier curves. Similarly, when considering the seismic action too, two arched chords are still considered, but lying on different planes. For this purpose, the upper chord of the truss arch has been supposed to lie on the horizontal plane, while the lower chord was shaped as an inclined arch. The two arches are connected by a bracing system, thus collaborating to bear the external loading. The horizontal arch primarily resists to the earthquake action that mainly determines its shape, while the vertical loads are transferred to the inclined arch, thus mainly affecting its shape.
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