PSI - Issue 62

Mariano Angelo Zanini et al. / Procedia Structural Integrity 62 (2024) 815–823 Zanini / Structural Integrity Procedia 00 (2019) 000 – 000

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4. Main results and discussion In this Section main results of the L3EV coefficient have been reported both in terms of bending moment (BM) and shear (S) demands. For each different traffic load model of those abovementioned, 720 L3EV coefficients have been derived, in order to capture the variability of this index in relation to the main geometrical features of the girder deck configuration. Results are illustrated separately as regards EV schemes provided by the MIT EV standard (MIT 2022) and the real EV configurations investigated, showing the values of L3EV coefficient as a function of the year of the deck design, resulting in multi-step charts where each step corresponds to a time interval in which a certain traffic load model remains in force until a further update of code prescription has been implemented. Figs. 4 and 5 show results obtained by the application of the MIT EV loading scheme 1080/135 (MIT 2022) respectively in terms of bending moment (BM) at the midspan and shear at the beams’ ends demands, whereas Figs. 6 and 7 illustrate for sake of example the outcome obtained for one of the real EV configurations analysed (S10 EV) in BM and S metrics.

EV 1080/135 – Free traffic & normal speed

EV 1080/135 – Free traffic & 30 km/h speed

L3EV BM

L3EV BM

period

Year of the design

Year of the design

EV 1080/135 – Traffic suspended & geometric limitations

EV 1080/135 – Traffic suspended

L3EV BM

L3EV BM

Year of the design

Year of the design

Fig. 4. MIT EV loading scheme 1080/135 – BM demand.

EV 1080/135 – Free traffic & normal speed

EV 1080/135 – Free traffic & 30 km/h speed

L3EV S † Ȁ †ǡ’‡”‹‘† L3EV S † Ȁ †ǡ’‡”‹‘†

L3EV S † Ȁ †ǡ’‡”‹‘† L3EV S † Ȁ †ǡ’‡”‹‘†

EV 1080/135 – Traffic suspended & geometric limitations Year of the design

Year of the design

EV 1080/135 – Traffic suspended

Year of the design

Year of the design

Fig. 5. MIT EV loading scheme 1080/135 – S demand.