PSI - Issue 62

Raffaella Romanello et al. / Procedia Structural Integrity 62 (2024) 990–997 R. Romanello, S. Lorefice, S. Massacci, G. Miceli / Structural Integrity Procedia 00 (2019) 000–000

996

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12. Verification Groups All structural elements were grouped by type, and different variable verification sections were identified for each in both the longitudinal and transverse directions.

Table 2. Verification groups STRUCTURAL ELEMENTS

ID

GROUP

SECTION

STUDDED CONNECTIONS Lower beams + connection plate Upper beams + connection plate Diagonal + connection plate

ID

Lower beams Upper beams Diagonals

LB UB D

5 5 8 4 3 2 2 2 2 1 3 2

5 6 8 6 5 8 2 3 2 1 3 2

LB+CP UB+CP

D+CP U+CP

Uprights

U

Upright + connection plate

Railway deck cross beams Road deck cross beams Covering cross beams Railway deck stringers

RACB ROCB

Railway deck cross beam + upright

RACB+U

Railway deck cross beam + Railway deck stringer Road deck cross beam + Road deck stringer Lower cross-bracing + plate on lower beam Upper cross-bracing + Plate on upper beam Angle member of Covering stringers + compound beams

RACB+RAS ROCB+ROS LCB+PLB UCB+PUB

CCB RAS ROS

Road deck stringers Covering stringers Lower cross-bracings Upper cross-bracings

CS

LCB UCB

LC+CB

CCB

CS

UB

UCB

ROCB

RACB

ROS

D

U

LB

LCB

RAS

Fig. 7. Overview of model showing verification groups

13. Structural reinforcement In the project proposals, the aim is to leave the architectural aspect and structural conception of the work unaltered, since it is subject to landscape, environmental and historical heritage protection pursuant to Legislative Decree 42/04 as amended and other sectorial regulations. Therefore, while respecting the structural configuration of the existing structural elements, made by assembling plates and angle members with studs, the overall approach has been to reinforce the sections of the profile members by inserting new plates or angle members, in order to obtain the increase in strength and stability required to satisfy the verifications. In order to maintain the original architectural appearance, the proposed projects included the use of high-strength (class 10.9) dome head bolts on the outer faces of the structural elements. In addition, in order to minimise the visual impact of the aforementioned bolted assembly, where possible, the bolts are distributed at the same pitch as the bridge’s existing bolts. For the sake of brevity, only one section is given below for each verification group, with its proposed structural reinforcement: