PSI - Issue 54

João Custódio et al. / Procedia Structural Integrity 54 (2024) 271–278

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João Custódio et al. / Structural Integrity Procedia 00 (2019) 000 – 000

are essential in the selection process, it is important that the effectiveness of the product or system, in mitigating these reactions, is also evaluated, either in the laboratory or in the field, before it is used to fully protect the affected structure. The variation in the product or system properties with ageing should also be evaluated. Table 1. Mandatory performance requirements of surface protection products and systems for all intended uses related to “p rinciple ” P2 and “method” Coating (CEN, 2004). Performance characteristic Test method Requirement/Class Water-vapour permeability EN ISO 7783 Class I: s D < 5 m (permeable to water vapour) Class II: 5m ≤ s D ≤ 50 m Class III: s D > 50 m (not permeable to water vapour) Liquid water permeability EN 1062-3 w < 0.1 kg·m -2 ·h -0.5 Bond strength by pull-off EN 1542 Crack-bridging or flexible systems Rigid systems Without Trafficking ≥ 0.8 N·mm -2 (average) (Individual values > 0.5 N·mm -2 ) ≥ 1.0 N·mm -2 (average) (Individual values > 0.7 N·mm -2 ) With trafficking ≥ 1.5 N·mm -2 (average) (Individual values > 1.0 N·mm -2 ) ≥ 2.0 N·mm -2 (average) (Individual values > 1.5 N·mm -2 )

3. Case study 3.1. Structure’s characteristic s

The structure considered in this study is a bridge in Portugal that was opened to traffic in 1998. It is a prestressed reinforced concrete structure with a curved plan and a total length of 900 m, divided into eleven spans, the largest of which is 180 m over the river. The deck consists of single-cell box girder with a width of 25.7 m and a height of 4.0 m between the north abutment and the P5 pillar, varying in the remaining sections with a maximum of 12.0 m over the P9 and P10 pillars. The deck is continuous along its entire length, rigidly connected to columns P7 to P10, and simply supported on the remaining columns and on the abutments. The deck crosses the valley 94 m above the valley floor and river. The abutments have a constant hollow square cross-section, the vertices of which are provided with rebar of varying size (Fig. 1). Both columns and abutments have direct foundations.

Fig. 1. Cross section of the column (left) and footing (right) of pier P8 (images courtesy of Armando Rito Engenharia, S.A.).