This book features contributions from M. Amabili, J.V. Araujo dos Santos, R.C. Barros, M.A. Bradford, M.T. Braz-Cesar, J.Y. Cognard, R. Creac'hcadec, G. Ernst, D.M. Frangopol, V. Gattulli, C. Huhne, B.A. Hussein, L. Kaczmarczyk, M.D. Kotsovos, N.M.M. Maia, L.G. Maqueda, C.A. Mota Soares, C.M. Mota Soares, G. Muscolino, L.A.C. Neves, D.V. Oliveira, C.J. Pearce, M.F. Pellissetti, Y.-L. Pi, R. Rolfes, G.I. Schueller, A.A. Shabana, A. Sofi, L. Sohier and M. Vogler. This volume includes the invited lectures presented at the Ninth International Conference on Computational Structures Technology held in Athens, Greece, September 2008.