TY - JOUR

T1 - Required proof load magnitude for probabilistic field assessment of viaduct De Beek

AU - Lantsoght, Eva

AU - van der Veen, Cor

AU - de Boer, A.

AU - Hordijk, Dick

PY - 2017

Y1 - 2017

N2 - Proof load testing is part of the engineering practice, and can be particularly useful for the rating of existing bridges. This paper addresses how reliability-based concepts can be used in combination with proof load testing, and discusses how this approach differs from the current practice for proof load testing. Whereas the calculation methods for determining the updated reliability index after a proof load test are available in the literature, this approach is now used to determine the proof load magnitude required to demonstrate a certain reliability level in a bridge, the viaduct De Beek. To determine the required proof load magnitude, the known integrals of the limit state function are solved. The method is applied to a case of a bridge that was proof load tested in the Netherlands, viaduct De Beek. The data of this bridge are used to determine the required proof load magnitude to fulfill a given reliability index. A sensitivity study is carried out to identify the effect of the assumptions with regard to the coefficient of variation on the resistance and load effects. The result of this approach is that large loads are necessary in proof load testing if a reliability index needs to be proven in a proof load test. In the current practice of proof load testing with vehicles, it can typically only be demonstrated that a certain vehicle type can cross the bridge safely. The results in this paper provide a new insight on the required proof load magnitudes to show that the reliability index of the tested bridge is sufficient. However, consensus on the coefficients of variation that need to be used on the resistance and load effects, is still missing, which significantly affects the results for the required proof load magnitudes.

AB - Proof load testing is part of the engineering practice, and can be particularly useful for the rating of existing bridges. This paper addresses how reliability-based concepts can be used in combination with proof load testing, and discusses how this approach differs from the current practice for proof load testing. Whereas the calculation methods for determining the updated reliability index after a proof load test are available in the literature, this approach is now used to determine the proof load magnitude required to demonstrate a certain reliability level in a bridge, the viaduct De Beek. To determine the required proof load magnitude, the known integrals of the limit state function are solved. The method is applied to a case of a bridge that was proof load tested in the Netherlands, viaduct De Beek. The data of this bridge are used to determine the required proof load magnitude to fulfill a given reliability index. A sensitivity study is carried out to identify the effect of the assumptions with regard to the coefficient of variation on the resistance and load effects. The result of this approach is that large loads are necessary in proof load testing if a reliability index needs to be proven in a proof load test. In the current practice of proof load testing with vehicles, it can typically only be demonstrated that a certain vehicle type can cross the bridge safely. The results in this paper provide a new insight on the required proof load magnitudes to show that the reliability index of the tested bridge is sufficient. However, consensus on the coefficients of variation that need to be used on the resistance and load effects, is still missing, which significantly affects the results for the required proof load magnitudes.

KW - Assessment

KW - Existing bridges

KW - Field testing

KW - Load effects

KW - Proof load testing

KW - Reliability-based assessment

UR - http://resolver.tudelft.nl/uuid:3395f48f-4060-4102-b66c-c63d98a3950a

U2 - 10.1016/j.engstruct.2017.07.010

DO - 10.1016/j.engstruct.2017.07.010

M3 - Article

VL - 148

SP - 767

EP - 779

JO - Engineering Structures

JF - Engineering Structures

SN - 0141-0296

ER -