Knowing the real dynamic properties of a structure, natural frequencies and vibration modes is essential to ensure comfort and safety for users, as well as predictability for maintenance of public equipment. With this objective in mind, two pedestrian footbridges on the São Paulo subway were monitored by IEME Brasil last March, which used Vibrodina, a mechanical device that makes the structure vibrate at a specific frequency range, in the dynamic forced vibration test.

“The precise determination of the structure’s natural frequency is extremely important for validating theoretical models and ensuring that it does not coincide with the excitation frequencies generated by pedestrian traffic. Avoiding resonance is essential to ensure user comfort and the structural integrity of the footbridge,” explains engineer Marco Juliani, director of IEME.

The footbridges are located at the Santo Amaro station of the São Paulo subway, which is shared by subway lines 5-Lilás (ViaMobilidade) and 9-Esmeralda, of CPTM. They are 111m long and 7.4m wide and are formed by a metal lattice structure with tubular profiles and a steel deck slab. The central span, which crosses the Pinheiros River, is approximately 80m long. The work is the responsibility of EGTC Infra.

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Accessibility for people with special needs (public and employees), as well as meeting the basic needs of comfort and safety of employees (in compliance with the NR-24 standard), is one of the focuses of an important contract between IEME Brasil and CPTM (Companhia Paulista de Trens Metropolitanos) for the refurbishment of 11 of the company’s stations.

Initiated in April 2018, the contract for specialized engineering and architecture technical services aims at the elaboration of the executive project for the adaptation of the stations and complete renovations, which include electrical, hydraulic and systems installations, intended to comply with the Fire Department Inspection Report (AVCB).

The work covers the following stations: Mooca, Ipiranga, São Caetano, Utinga, Prefeito Saladino, Santo André, Capuava, Mauá, Guapituba, Ribeirão Pires and Rio Grande da Serra.

So far, the complete executive projects for the renovation and adaptation of Capuava, Prefeito Saladino, São Caetano and Utinga stations have been completed, which have already been tendered and built. Tenders for the construction of the Santo André and Mauá stations are in progress. The executive projects for the other stations had different stages of development, but were interrupted by the client’s decision.

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