China
Africa
Explore chapters and articles related to this topic
Bridges continuous dense monitoring network: A framework to support the infrastructures assessment and management process
Published in Joan-Ramon Casas, Dan M. Frangopol, Jose Turmo, Bridge Safety, Maintenance, Management, Life-Cycle, Resilience and Sustainability, 2022
I. Alovisi, A. Cigada, D. La Mazza, M. Longo
Serviceability limit states correspond to the states beyond which specified demands for a structure, or a structural component related to its normal use or function are no longer met (Fib MC2010, 2013). The serviceability of a structure is the purpose of a maintenance strategy to guarantee the required functionality to the users and this can be obtained by relating it with the current condition of the existing structure.
Life cycle optimization of durability performance of built infrastructure using multi-physics deterioration models
Published in Airong Chen, Xin Ruan, Dan M. Frangopol, Life-Cycle Civil Engineering: Innovation, Theory and Practice, 2021
Better design considering durability performance of built structures could increase service life and delay maintenance and repair activities which would potentially increase the construction cost (International Federation for Structural Concrete 2006). For instance, a larger cover thickness of reinforced concrete could increase the time needed for chloride ions or carbonation front to reach the reinforcing steel surface and thus delay the corrosion initiation of reinforcing steel. However, larger cover thickness would increase material usage and also self-weight load of structure requiring higher structure resistance. On the other hand, the management and maintenance of built facilities during their operation and use phase is also essential to maintain an acceptable level of serviceability and to minimize life cycle costs. Currently, facility owners typically often defer maintenance until major defects or damage are observed (Akcamete et al. 2010). With appropriate information, modeling, and planning, preventive maintenance can be performed before deterioration propagates, allowing buildings to maintain serviceability and extend service life, while essential maintenance can restore reduced performance to a desired or safe service level (Frangopol et al. 2001). As shown in Figure 1, Lepech et al. presented different maintenance plan that could generate different probabilistic envelopes for cumulative impact from construction to functional obsolescence (Lepech et al. 2016).
A Dynamic System Identification of the Ha’penny Footbridge
Published in Nigel Powers, Dan M. Frangopol, Riadh Al-Mahaidi, Colin Caprani, Maintenance, Safety, Risk, Management and Life-Cycle Performance of Bridges, 2018
R. Donnelly, M. Nogal, P. Gorman, A.J. O’Connor
The continuous development of high-performance building materials has led to an increasingly common trend towards the design of lighter and more flexible bridge structures. This is especially true in the design of pedestrian bridges, which are typically more slender due to lower loading requirements and typically shorter spans. With this low stiffness and mass comes reduced natural frequencies and hence, a higher probability of resonant vibrations during service. Excessive vibrations can lead to serviceability failure, in that the bridge may be rendered unsuitable for use by the public, or in ultimate failure due to fatigue and related damage. A lack of understanding of the modal identity of pedestrian structures can result in serious consequences, as was seen in the excessive movement of the London Millennium Footbridge shortly after it’s opening in 2000 (Dallard et al., 2001). This widely-publicised failure incited an increased interest in the study of lateral excitations and responses, where previous research had primarily been focused on vertical movement.
Durability-based design: Asian perspectives
Published in Sustainable and Resilient Infrastructure, 2023
The latest edition of SSCS includes the durability-based design (JSCE, 2018). The durability design ensures the degradation of structural performance during service life remaining negligible so that the verification of required performances, safety, serviceability and restorability, can be conducted without considering the durability-related degradation. However, the SSCS is implementing the parallel concept that the verification of required performances can be conducted with consideration of degraded structural performance once the reliable prediction method for degradation of structural performances is well developed. Allowing degradation of structural performances may provide more economical solutions in terms of life-cycle costs. The assurance of durability during service life is achieved not only by the initial durability-based design but also the maintenance and intervention provided afterwards. The durability limit states can be different for different maintenance planning. No degradation of structural performance is be allowed for the proactive maintenance. The reactive maintenance allows for acceptable extent of degradation and the corresponding intervention is planned at the design stage.
A novel approach for deterioration and damage identification in building structures based on Stockwell-Transform and deep convolutional neural network
Published in Journal of Structural Integrity and Maintenance, 2022
Vahid Reza Gharehbaghi, Hashem Kalbkhani, Ehsan Noroozinejad Farsangi, T.Y. Yang, Andy Nguyen, Seyedali Mirjalili, Christian Málaga-Chuquitaype
The accumulation of deterioration in structures during their lifetime leads to the reduction of strength and performance and imperils their serviceability and safety (Monavari, 2019). Subsequently, the capability of structure to endure extreme incidents diminishes over time. Hence, preserving the functionality of structures and enhancing their performance level to reduce upkeep costs have become a central focus in structural health monitoring (SHM). It is noteworthy that embedding an SHM system on the structure can continuously monitor the system’s changes during operation time. This potential allows the determination of the appropriate moment for essential or preventive maintenance action (EMA and PMA) and thereby dwindles the risk level of probable breakdowns (Figure 1).
Multihazard resilience of highway bridges and bridge networks: a review
Published in Structure and Infrastructure Engineering, 2019
Swagata Banerjee, B Sharanbaswa Vishwanath, Dinesh Kumar Devendiran
To achieve an optimal maintenance strategy, cost of maintenance should be minimised without compromising the safety and serviceability of structures. Cost of maintenance greatly depends on the maintenance strategies under consideration and time at which maintenance is performed. With an objective of finding optimal maintenance strategies for bridges, past studies used various performance indices (in the context of life-cycle maintenance) to represent degraded conditions of bridges and highway networks. While degree of deterioration, condition index, safety index, risk, target reliability are used widely as performance indices (Barone & Frangopol, 2014; Kong & Frangopol, 2005; Liu & Frangopol, 2005a, 2005b; Zhu & Frangopol, 2013), resilience has also been used for the same (Chandrasekaran & Banerjee, 2016; Frangopol & Bocchini, 2011).