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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IEME Brasil has just received the INMETRO Accreditation from the National Institute of Metrology, Quality and Technology to act as an Accredited Inspection Body (OIA) and inspect projects and engineering works prepared by public and private companies subject to inspection by regulatory bodies. In Brazil, only 13 companies – including IEME – have OIA status.

Engineer Alexandre Verski, general manager of Project Inspection at IEME, who led the company’s team in the accreditation process with INMETRO, explains that, in the concession contracts for a highway, railway or other road work to the private sector, “all engineering projects, before being executed by the concessionaire, must be approved by the agencies” and the OIA is a kind of “INMETRO representative in the inspection of projects”. Project inspection, therefore, is a mandatory contractual requirement for concessionaires.

From a marketing point of view, the INMETRO Accreditation opens a new front of services for IEME Brasil, a company with more than 30 years of experience in the areas of Engineering Projects (metro-railway systems, bridges, dams, stadiums and structures in general), Urban Development (land regularization, urbanization of settlements, accessibility and social work) and Laboratory Tests (LAEDE) focused on subway railways, civil structures and shock absorbing systems, elastomers, vibration, noise and construction materials.

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