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- 저자 : Pascuzzo (검색결과 3 건)
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Design analysis of the optimum configuration of self-anchored cable-stayed suspension bridges
Lonetti, Paolo,Pascuzzo, Arturo Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.51 No.5
This paper describes a formulation to predict optimum post-tensioning forces and cable dimensioning for self-anchored cable-stayed suspension bridges. The analysis is developed with respect to both dead and live load configurations, taking into account design constrains concerning serviceability and ultimate limit states. In particular, under dead loads, the analysis is developed with the purpose to calculate the post-tensioning cable forces to achieve minimum deflections for both girder and pylons. Moreover, under live loads, for each cable elements, the lowest required cross-section area is determined, which verifies prescriptions, under ultimate or serviceability limit states, on maximum allowable stresses and bridge deflections. The final configuration is obtained by means of an iterative procedure, which leads to a progressive definition of the stay, hanger and main cable characteristics, concerning both post-tensioning cable stresses and cross-sections. The design procedure is developed in the framework of a FE modeling, by using a refined formulation of the bridge components, taking into account of geometric nonlinearities involved in the bridge components. The results demonstrate that the proposed method can be easily utilized to predict the cable dimensioning also in the framework of long span bridge structures, in which typically more complexities are expected in view of the large number of variables involved in the design analysis.
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Design analysis of the optimum configuration of self-anchored cable-stayed suspension bridges
Paolo Lonetti,Arturo Pascuzzo 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.51 No.5
This paper describes a formulation to predict optimum post-tensioning forces and cable dimensioning for self-anchored cable-stayed suspension bridges. The analysis is developed with respect toboth dead and live load configurations, taking into account design constrains concerning serviceability and ultimate limit states. In particular, under dead loads, the analysis is developed with the purpose to calculate the post-tensioning cable forces to achieve minimum deflections for both girder and pylons. Moreover, under live loads, for each cable elements, the lowest required cross-section area is determined, which verifies prescriptions, under ultimate or serviceability limit states, on maximum allowable stresses and bridge deflections. The final configuration is obtained by means of an iterative procedure, which leads to aprogressive definition of the stay, hanger and main cable characteristics, concerning both post-tensioningcable stresses and cross-sections. The design procedure is developed in the framework of a FE modeling, by using a refined formulation of the bridge components, taking into account of geometric nonlinearities involved in the bridge components. The results demonstrate that the proposed method can be easily utilized to predict the cable dimensioning also in the framework of long span bridge structures, in which typically more complexities are expected in view of the large number of variables involved in the design analysis.
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A Practical Method for the Elastic Buckling Design of Network Arch Bridges
Paolo Lonetti,Arturo Pascuzzo 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.1
Network arch bridges under the action of vertical loads are aff ected by out-of-plane instability phenomena, which strongly reduce their structural integrity. Current design codes on steel arch bridges do not provide complete and adequate methodologies for the buckling design since they are based on linear buckling analyses, whose predictions in many cases overestimate the actual bridge capacity. In the present paper, a numerical procedure is implemented with the purpose to derive simple analytical expressions for the evaluation of critical axial force in network arch bridges. The proposed study is developed by means of progressive analyses, in which at fi rst variability screening analysis is developed to identify worst instability scenarios with respect to all geometrical and mechanical characteristics in typical allowable ranges. Subsequently, explicit parametric analyses are developed to identify instability curves for several bridge confi gurations. The validity of the formulation is verifi ed by means of comparisons with advanced analyses based on the FEM. The proposed results in terms of buckling curves may help the designer to achieve a proper estimation of the critical buckling load without developing sophisticated and complex nonlinear analyses.
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