Seismic Analyses Of The Messina Bridge Project
Author(s)
S. Hernández, L. E. Romera, A. Baldomir & F. Bravo
Abstract
In this paper several preliminary works developed to determine the seismic
response of the Messina Bridge project are presented. Firstly the different types
of non-linear structural models developed are shown, including global models
for the macro-level static and dynamic analysis, and local models for the
micro-level analysis. Then, the analyses and several results obtained for static
and nonlinear seismic time histories analyses are explained. Finally, the results
of the Messina local tower model with a longitudinal push-over analysis are
presented.
1 Introduction
The suspension bridge over the strait of Messina (figure 1) will link Sicily and
Calabria with the world longest center span of 3.300 m. The preliminary design
used as the basis of the analysis that appear in this article, was developed by
Chodai Co., Ltd. in 2004, following the analysis and design specifications for the
bridge (ref.TSA002) developed by the concessionaire Stretto Di Messina S.p.A
which carries out the research, design, construction and operation of the bridge.
Figure 2 shows the transversal bridge section and one of the towers. The
bridge section has three principal girders, one central for two railways and two
laterals for road traffic. These girders are connected with transversal girders
spaced 30 m. in the longitudinal direction, and suspended at its ends from
hangers that connect them with the main cables. The main cables are connected
to the ground at the splay saddle in the anchorage, and to the tower saddle at the
towers. Figure 3 shows a realistic visualization detail of these girders.
The towers as well as the girders and the suspension system were executed in
structural steel of qualities between S355J0 and S420J0. Each tower has an
approximate height of 382 m, with a self-weight greater than 5 x 105 kN, and is
composed of two inclined columns connected by four transversal girders.
Keywords
Related Book
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