Issue 38

P. Lonetti et alii, Frattura ed Integrità Strutturale, 38 (2016) 359-376; DOI: 10.3221/IGF-ESIS.38.46 375 bridge typologies, comparisons with existing schemes based on pure cable-stayed and suspension systems are presented. From the results, the following conclusions can be drawn:  the inelastic material behavior affects significantly the maximum load carrying capacity of the bridge structure. Models which exclude the inelastic behavior of structural members may lead to a generalized overestimation of the loading bearing capacity of the structure.  The bearing capacity of the bridge structure increases with the length of cable-stayed portion and the inelastic material behavior affects the maximum carrying capacity especially in the case of cable-stayed dominated bridge schemes.  Large values of girder and pylon bending stiffnesses lead to considerable benefits in terms of load bearing capacity, avoiding local instabilities due to buckling effects.  The cable-stayed portion, based on a fan, semi-fan or harp configurations, strongly affects the load bearing capacity of the structure. The fan system involves the best performances especially with reference to low values of the height-span ratio.  From the parametric studies developed in terms of material and geometric characteristics of both girder and pylons, suspension system configuration, it transpires that self-anchored cable-stayed suspension bridges may be considered as an enhanced opportunity to overcome long spans with respect to conventional bridge schemes based on pure cable-stayed or suspension systems. R EFERENCES [1] Gimsing, N.J., Georgakis, C.T., Cable supported bridges. Concept and design. Third ed.: John Wiley & Sons, Ltd. (2012). [2] Troitsky, M.S., Cable-stayed bridges. Theory and design. Second ed: BSP Professional Booka, Oxford, (1988). [3] Oliveira, D.V., Lourenço, P.B., Lemos, C., Geometric issues and ultimate load capacity of masonry arch bridges from the northwest Iberian Peninsula. Engineering Structures, 32 (2010) 3955-3965. DOI: 10.1016/j.engstruct.2010.09.006. [4] Fasoulakis, Z.C., Avraam, T.P., Raftoyiannis, I.G., Dynamic buckling of partially-sway frames with varying stiffness using catastrophe theory. International Journal of Non-Linear Mechanics, 71 (2015) 116-126. DOI: 10.1016/j.ijnonlinmec.2014.10.002. [5] Tang, M.-C., Buckling of cable-stayed girder bridges. ASCE J Struct Div, 102 (1976) 1675-1684. [6] Nagai, M., Asano, K., Watanabe, K., Applicability of the Ef method and design method for evaluating the load- carrying capacity of girders in cable-stayed bridges. Journal of Structural Engineering, 41 (1995) 221-228. [7] Xi, Y., Kuang, J.S., Ultimate load capacity of cable-stayed bridges. Journal of Bridge Engineering, 4 (1999) 14-21. [8] Nakai, H., et al., Elasto-plastic and finite displacement analysis of cable-stayed bridges. Memoirs of the Faculty of Engineering, Osaka City University, 26 (1985) 251-271. [9] Kim, S.E., Park, M.H., Choi, S.H., Direct design of three-dimensional frames using practical adavanced analysis. Engineering Structures, 26 (2001) 1491-1502. [10] Iwasaki, H., Nogami, K., Nagai, M., Precision of EF method for evaluating load-carrying capacity of long-span cable-stayed bridges and its ultimate strength check, in Cable-Supported Bridges - Challenging Technical Limits. International Association for Bridge and Structural Engineering, Seoul, (2001) 17-24. [11] Tomblin, J., Barbero, E., Local buckling experiments on FRP columns. Thin-Walled Structures, 18 (1994) 97-116. [12] Yoo, H., Choi, D.H., New method of inelastic buckling analysis for steel frames. Journal of Constructional Steel Research, 64 (2008) 1152-1164. DOI: 10.1016/j.jcsr.2008.01.024. [13] Yoo, H., Na, H.S., Choi, D.H., Approximate method for estimation of collapse loads of steel cable-stayed bridges. Journal of Constructional Steel Research, 72 (2012) 143-154. DOI: 10.1016/j.jcsr.2011.12.003 [14] Seif, S.P., Dilger, W.H., Nonlinear analysis and collapse load of P/C cable-stayed bridges. Journal of structural engineering New York, N.Y., 116 (1990) 829-849. [15] Xie, X., Nagai, M., Yamaguchi, H., Elasto-plastic finite displacement analysis of loan-span cable-stayed bridges including inelastic behavior of cables. Journal of Structural Engineering, JSCE, 44 (1998) 229-236. [16] Ren, W.X., Ultimate behavior of long-span cable-stayed bridges. Journal of Bridge Engineering, 4 (1999) 30-37. [17] Choi, D.H., et al., Ultimate behavior and ultimate load capacity of steel cable-stayed bridges. Structural Engineering and Mechanics, 27 (2007) 477-499. [18] Barbié, L., Ramière, I., Lebon, F., An automatic multilevel refinement technique based on nested local meshes for nonlinear mechanics. Computers and Structures, 14 (2014) 14-25. DOI: 10.1016/j.compstruc.2014.10.008.