PSI - Issue 5

Manuel Angel Díaz García et al. / Procedia Structural Integrity 5 (2017) 1334–1341 Manuel Angel Díaz García/ Structural Integrity Procedia 00 (2017) 000 – 000

1341

8

K sb is the self-balancing component of the residual stress profile Table 1 shows some of the critical crack values (a c ) obtained at specific positions on the deck and for the 3 hypotheses of crack geometries being considered. For a correct interpretation it is necessary to take into account that in the case of through thickness cracks, a c is the half-length of the defect observed in surface whereas in the semielliptical cracks the size of the crack width observed in surface is 2 and 10 times greater than a c aspect ratios of 0.5 and 0.1, respectively.

Table 1. Critical crack values in joints. Type of joint

PK or position

Plate

Stress (MPa)

Thickness (mm)

ac (mm) Through thickness crack

ac (mm) Semi elliptic crack (a/2c=0.5)

ac (mm) Semi elliptic crack (a/2c=0.1)

First and second types of joints (butt) (Longitudinal direction of the deck) Third type of joints (variable thickness) (longitudinal direction of the deck) Fourth type of joints (T-joints) (longitudinal direction of the deck) First and second types of joints (butt) (Transverse direction of the deck) Third type of joints (variable thickness) (Transverse direction of the deck) Fourth type of joints (T-joints) (Transverse direction of the deck)

886

1

224

20

10.4

10.6

6.1

886

1

224

20

10.4

10.6

6.1

886

1

224

20

13

10.6

6.1

Cable zone

4

310

12

7

3.4

1.8

Cable zone

4

310

12

7

3.4

1.8

Cable zone

4

310

12

8.7

3.4

1.8

11. Conclusions

Within the framework of the inspection and maintenance plan of the Bridge of the Constitution of 1812 on the Bay of Cadiz, a section has been incorporated for the inspection of cracks in the deck, with special emphasis on specific points where the inspection must be more careful. The result of the Structural Integrity Evaluation of the deck shows that the dimensions of the critical cracks have minimum values around 14 mm in the case of through thickness cracks, and around 6 mm for semielliptical cracks (assuming 0.5 as the aspect ratio). [1] Instrucción de hormigón estructural EHE-08. Ministerio de Fomento (2008). [2] Instrucción de acero estructural EAE. Ministerio de Fomento (2011). [3] Instrucción sobre las acciones a considerar en el proyecto de puentes de carretera IAP-11. Ministerio de Fomento (2011). [4] PEDRAZO MAJÁRREZ, F. “Introducción al Puente de la Constitución de 1812 sobre la bahía de Cádiz”. Hormigón y Acero. 2016, vol. 67, número 278-279. [5] EN 1993-1-9, Eurocódigo 3: Proyecto de estructuras de acero. Parte 1-9: Fatiga. European Committee for Standardization (CEN). 2005. [6] UNE-EN ISO 4063. Soldeo y técnicas conexas. Nomenclatura de procesos y números de referencia. (2011). [7] EN 10027-1:2006, Sistemas de designación de aceros. Parte 1: Designación simbólica. European Committee for Standardization (CEN). 2006. [8] EN ISO 6892 ‐ 1:2010, Materiales metálicos. Ensayo de tracción. Parte 1: Método de ensayos a temperatura ambiente. European Committee for Standardization (CEN). 2010. [9] ASTM E466-07, Standard practice for conducting force controlled constant amplitude axial fatigue test of metallic materials. American Society for Testing and Materials. 2007. [10] ASTM E1820 ‐ 13, Standard test method for measurement of fracture toughness. American Society for Testing and Materials. 2013. [11] BS 7910 2013 , “Guide to methods for assessing the acceptability of flaws in metallic structures”, British Standards Institution, Lon don (2013). References