PSI - Issue 62

Giada Limongi et al. / Procedia Structural Integrity 62 (2024) 97–104 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

102

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The test case allows to assign a criterion for the definition of an adequate alternative in absence of specific transportation studies and aims at broadening the discussion of accessibility from the single element (road or bridge) to the entire territory. Also, some limitations and future developments of this proposal must be noted. First, the classification of inner areas is made on a national scale and defines the peripherality of each municipality to the nearest center (A or B) which is not necessarily the one usually reached for essential services. Indeed, many municipalities of the test case are linked to centers outside the province or outside the region rather than the provincial capital. Furthermore, the test case does not include municipalities classified as ultra-peripheral (F). In the case of ultra peripheral municipalities, as there are no maximum threshold values for travel times, a further criterion should be defined to consider the adequacy of the alternative. This could be an incremental value proportional to the threshold values of the lower classes or it could automatically lead to the conclusion of the absence of adequate alternatives. It is worth underlining that the municipalities classified as belt (C) have not been included due to their greater proximity to the centers and the greater redundancy of road alternatives. But the procedure can also be easily replicated in the remaining belt municipalities. 4. Conclusion Ensuring the accessibility of peripheral territories to essential services is a cornerstone both for ensuring socio economic development and emergency response. However, the growing vulnerability of road networks and their critical elements to natural hazards and aging, highlights the urgent need for improvement and adaptation actions of existing infrastructures. To this aim, the risk assessment of existing bridges is a pivotal starting point to implement an intervention plan on existing bridges and increase the resilience of the road networks. Among the parameters determining the exposure class of bridges, the presence of road alternatives is often entrusted to specific transportation studies. This aspect influences the accessibility of the territories in case of bridge interruptions due to maintenance interventions or damage. However, in the absence of transportation studies it is appropriate to identify alternative methods to evaluate the presence of suitable alternatives. The empirical case of the bridges along the provincial roads in Caserta offers an alternative method useful for evaluating the adequacy of road alternatives starting from the class of peripherality of the inner municipalities. This method allowed to distinguish cases of presence or absence of adequate alternatives on a set of 150 bridges and can be applied to further case studies, as the classification of inner areas is available for all municipalities. Also, such a criteria may help to plan and prioritize maintenance interventions and temporary interruptions by identifying critical areas on which more in-depth studies of alternatives are essential. Acknowledgements Part of the present study has been developed within the activities commissioned by Province of Caserta to the Department of Architecture and Industrial Desing of the University of Campania “Luigi Vanvitelli”. Appendix A. Output data

new class

SNA I class

Center (AorB)

main route

alternative route

Municipality

travel time

travel time

provicial roads

bridges

SP

46001 229002-003-007 333010

Santa Maria La Fossa

AVERSA

D

29 SP333-SP229-SP46

35 SP30

330108 66012 69001

Alife

E

46,3 SP66-SP69-SP330

53 SS158

Castello del Matese Gioia Sannitica

69001 331002-004-010

E E E E

58,6 SP69-SP331

81 SP331 46 SP69 56 SP331 54 SP83

F

BENEVENTO

41,3 SP83 50,3 SP66

-

Piedimonte Matese San Potito Sannitico

66012

49 SP290

290002-005-007-009-010-011-013-018

331048-049-051 273009-010-015-019

CAMPOBASSO Letino

E

64,9 SP331-SP273

79 SP89

F