The present paper addresses the question of developing design criteria for thermal effects in concrete bridges. The objective is to determine extreme temperature effects having specified return periods. The parameters of the local meteorological regime which critically affect the extreme thermal effects are identified. Their variation in time is analyzed and related to the thermal loading parameters in a concrete bridge. These include average temperature, temperature difference between sections, linear temperature differential, and residual temperature fields. The analysis of the extreme values of these parameters is described in detail.The reduction of data, the model development, and the statistical analysis are clarified by the application to the Bow River light rail transit bridge in Calgary, Alberta. Temperature profiles in several sections of this structure are being measured on an hourly basis. The findings of this study show certain shortcomings of the temperature effects design criteria currently included in the Canadian bridge design codes.concrete box girder bridges.Le present article porte sur l'elaboration de crithes de conception relatifs aux effets thermiques touchant les ponts a structure de beton. L'objectif vise Ctait de determiner les effets des temperatures extrCmes ayant des periodes de recurrence specifiques. Les paramktres de regime mCtCorologique local qui ont une incidence critique sur les effets thermiques extrCmes sont presentes. Une analyse de leur variation dans le temps a it6 effectukes et des rapports de cause a effet ont ete etablis avec les paramktres de contrainte thermique d'un pont en beton. Ceux-ci comprennent la temperature moyenne, la difference de temperature entre les sections, l'ecart de temperature linCaire et les champs des temperatures residuelles. L'analyse des valeurs extrCmes de ces paramktres est decrite en details.La reduction des donnees, l'elaboration d'un modkle et l'analyse statistique ont ete appliques a un exemple concret, en l'occurrence le pont ferroviaire qui enjambe la rivihe Bow a Calgary, en Alberta. Le profil de temperature de plusieurs sections du pont a Ct C mesure toutes les heures. Les risultats de 1'Ctude montrent que les critkres d'evaluation des effets de la temperature prksentes dans les codes canadiens de conception des ponts comportent certaines carences.Mots clPs : valeurs extrCmes, temperature de calcul, contrainte thermique, gradient thermique, mesure de la temperature, pont a poutres-caissons en beton.[Traduit par la redaction] Can. I. Civ. Eng. 19, 935-946 (1992)
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