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Survey on life-cycle structural performance indicators for bridges
Published in Nigel Powers, Dan M. Frangopol, Riadh Al-Mahaidi, Colin Caprani, Maintenance, Safety, Risk, Management and Life-Cycle Performance of Bridges, 2018
The terms redundancy and robustness are often used as synonymous, but they refer to different system performance. Structural robustness is the ability of the system to suffer an amount of damage not disproportionate with respect to the causes of the damage itself. According to this definition, a measure of robustness should arise by comparing the system performance in the original state, in which the structure is fully intact, and in a perturbed state, in which a prescribed damage scenario is applied. Robustness is generally evaluated with respect to damage suddenly provoked by accidental actions and abnormal loads. However, depending on the damage propagation mechanism, aging and progressive deterioration may also involve disproportionate effects.
Risk-Based Decision Framework for Resilient Highway Bridges
Published in Jaap Bakker, Dan M. Frangopol, Klaas van Breugel, Life-Cycle of Engineering Systems, 2017
ISO 2394 (2015) defines structural robustness as the ability of a structure to withstand adverse and unforeseen events (like fire, explosion, impact) or consequences of human errors without being damaged to an extent disproportionate to the original cause. It is also referred to as damage insensitivity. In current bridge design codes and standards, the requirement of robustness is not specified explicitly. A significant interest in structural robustness and progressive collapse was generated following the Rona Point Building failure in 1968 and regenerated following the World Trade Center incidents in 2011 (Canisius 2011). The design of robust highway bridges could be achieved by ensuring that the structural system provides alternative load paths, adequate redundancy, ductility, and protection against cumulative damage and human error.
Challenges in the application of digital transformation to inspection and maintenance of bridges
Published in Structure and Infrastructure Engineering, 2022
Marcos Massao Futai, Túlio N. Bittencourt, Hermes Carvalho, Duperron M. Ribeiro
The concepts of structural robustness and resilience are necessary to achieve sustainability (Biondini & Frangopol, 2016; Bocchini, Frangopol, Ummenhofer, & Zinke, 2014), not only for the individual structural systems but for their network as well. Structural robustness can be viewed as the ability of the system to suffer an amount of damage not disproportionate with respect to the causes of the damage itself (Saydam & Frangopol, 2011), while resilience is the ability of a system or a network of systems to absorb or avoid damage without suffering complete failure. It is an important new objective of design, maintenance and repair of bridges and infrastructure in general, as well as communities. Robustness and recovery of the transportation network depend strongly on the performance of its individual bridges. Bridges are the weakest links in any road transportation system because of their vulnerability to hazards and deterioration (Akiyama & Frangopol, 2018).
Risk-based robustness assessment of steel frame structures to unforeseen events
Published in Civil Engineering and Environmental Systems, 2018
Structural robustness is an important aspect of structural reliability, which is emphasised as the ability of a structure to maintain its function in a potential hazard. A structure could be determined as a robust one for (Blockley et al. 2002): (1) either preventing the action or reducing it to an acceptable probability, (2) ensuring the functional integrity of the buildings and (3) reducing the building sensitivity to disproportionate collapse. However, no general definition and acceptable evaluation system of structural robustness exists at present (Faber 2006; Formisano, Landolfo, and Mazzolani 2015).