Mitigation of vibrations induced by railway traffic in tunnels through floating slab systems: numerical study

• Type: Article in International Conference Proceedings Book
• Date: 2014

Authors

Lopes, P (Author) Other; Costa, PA (Author) Other; Rui Calçada (Author) FEUP; Cardoso, AS (Author) Other

Conference proceedings International

Title: EURODYN 2014: IX INTERNATIONAL CONFERENCE ON STRUCTURAL DYNAMICS

Pages: 871-878

9th International Conference on Structural Dynamics (EURODYN)

Porto, PORTUGAL, JUN 30-JUL 02, 2014

Indexing

ISI Web of Knowledge - 2 Citations

Scopus - 3 Citations

Other information

Authenticus ID: P-00G-AWB

Abstract (EN): The growing of the urban areas demands the development of efficient transport systems, as for instance, modern metro lines. However, this development should be environmentally sustainable, requiring the mitigation of some nefarious effects, such as the vibrations induced by the traffic. Distinct solutions for the mitigation of vibrations induced by railway traffic in tunnels can be adopted, being grouped as function of the position where are introduced: i) at the source; ii) at along the path; iii) at the receiver. In the present paper a numerical investigation is presented in order to deeper understand the efficiency of floating slab systems on the mitigation of vibrations at a building close to a railway tunnel. The numerical approach followed is based on the sub-structuring technique in order to allow an efficient simulation of the vibrations induced by traffic in tunnels from the source to the receiver (building). The numerical model is divided into three distinct parts, comprising the simulation of rolling stock, the simulation of the tunnel-ground system and the simulation of the building. The solution is obtained by a compliance formulation between the three sub-systems, developed in the frequency domain. Regarding the simulation of the tunnel-ground system, which deals with unbounded domain problem, an efficient solution is developed using a 2.5D technique based on the finite elements method and adopting perfect matched layers (PML's) for the treatment of the boundaries due to the truncation of the finite elements mesh. On the other hand, the rolling stock is modeled using a multi-body approach, being the building simulated by a traditional 3D finite element approach. Different floating slab systems are studied and their efficiency is compared. Moreover, some practical rules for the design of this type of solutions for the mitigation of vibrations are also presented.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8