Bozidar Stojadinovic


Last Name

Stojadinovic

First Name

Bozidar

ORCID

0000-0002-1713-1977

Organisational unit

03930 - Stojadinovic, Bozidar / Stojadinovic, Bozidar

Search Results

Publications 1 - 10 of 283
  • Rocking Response of Slender Flexible Columns under Pulse Excitation
    Item type: Other Conference Item
    Vassiliou, Michalis F.; Mackie, Kevin R.; Stojadinovic, Bozidar (2013)
  • Development of a Soft Layer for Seismic Response Modification of Structural Masonry Walls
    Item type: Conference Paper
    Mojsilović, Nebojša; Stojadinovic, Bozidar (2014)
    Proceedings of the 10th National Conference in Earthquake Engineering (10 NCEE)
  • Effect of ground motion sequence on response of squat reinforced concrete shear walls
    Item type: Journal Article
    Whyte, Catherine A.; Stojadinovic, Bozidar (2014)
    Journal of Structural Engineering
  • Seismic Assessment of an Existing Swiss Unreinforced Masonry Building with Flexible Floor Diapgragms
    Item type: Conference Paper
    Arslantürkoglu, Safak; Volken, Nicolas; Mojsilović, Nebojša; et al. (2021)
    WCEE Online Proceedings ~ Proceedings of the Seventeenth World Conference on Earthquake Engineering Japan 2021
    Switzerland is a country of low and moderate seismicity. Nonetheless, because unreinforced masonry (URM) residential buildings are a major portion of the built inventory, the seismic risk is not negligible. To meet a growing need for seismic evaluation of buildings, SIA 269/8, a Swiss code for seismic assessment of structures, was recently adopted. SIA 269/8 prescribes a risk-based seismic evaluation using the compliance factor concept, a factor that relates the seismic capacity of an existing building to the seismic capacity corresponding to the collapse safety requirement of a hypothetical (essentially) identical new structure. The goal is to achieve an acceptable low risk of casualties (between 10-5 and 10-6 individual annual casualty risk linked to compliance factor values between 25% and 100%). SIA 269/8 also defines a process on how to decide if a seismic retrofit is mandatory or not and how to select the retrofit measures that are commensurable to the actuarial value of the potentially saved lives. This paper presents a case-study investigation of a typical existing Swiss URM building with flexible floor diaphragms that features an in-depth analysis of both local failures and global building behavior. Prior to undertaking a global nonlinear static analysis, local failure modes such as the out-of-plane wall failure mechanism, support and resistance of the floor diaphragms, and the load transfer from the floor diaphragm to walls were examined. The main emphasis was on the interaction between the out-of-plane responding walls and the flexible floor diaphragms. The force-based method based on rigid-body motions and the Paulay & Priestley approach were considered. Being known for its conservatism, the latter is still the most common approach among the Swiss engineering community. Equivalent frame approach was then used to model the building globally, followed by the global seismic performance assessment using the N2 method that compares the displacement demand to the displacement capacity of the entire structure. The outcome of the SIA 269/8 evaluation procedure is that the governing compliance factor of 75% is dictated by the out-of-plane responding wall of the north façade, resulting in a corresponding cost limit of 7’500 USD. In other words, seismic retrofit is mandatory if the upgrade related cost does not exceed 7’500 USD. Following SIA 269/8, a seismic upgrade may be waived if the expected cost is higher than this threshold value as the achieved risk reduction is not reasonably justified. The findings of this case study indicate that an implicit assumption of global structural integrity may give a false sense of safety for URM buildings with flexible diaphragms as local failure mechanisms often govern the structural performance. Another distinct finding to emerge from this study is the importance of updating of geometric and material parameters of the existing structure for the seismic capacity assessment using in-site investigations and laboratory tests to improve the often limited knowledge of the current state of the building and reduce uncertainties.
  • Supply/demand interface for disaster resilience assessment of interdependent infrastructure systems considering privacy and security concerns
    Item type: Journal Article
    Blagojević, Nikola; Stojadinovic, Bozidar (2023)
    Environment Systems & Decisions
    The ability to swiftly restore functionality following an extreme event is an essential characteristic of a disaster resilient infrastructure system. However, the restoration of functionality of a single infrastructure system often depends on the functionality of other systems that provide resources the considered system needs to operate and recover. Furthermore, infrastructure systems are crucial for the post-disaster functional recovery of the building stock of a community. Thus, community resilience assessment and improvement require a system-of-systems perspective, considering the post-disaster performance of several interdependent infrastructure systems and the building stock at the same time. One of the principal issues in resilience assessment and improvement is that such system-of-systems consideration may require detailed information on the vulnerability and recoverability of numerous components. While such information might be available for certain systems (e.g., housing), for others, the information might be unavailable due to privacy and security concerns (e.g., electric power supply systems or buildings housing important functions). In this paper, we propose a supply/demand interface between the system-of-systems simulator, defined within the interdependent Resilience - Compositional Demand/Supply (iRe-CoDeS) framework, and the individual infrastructure system simulators. Such an interface can be used for regional recovery simulation and resilience assessment of interdependent infrastructure systems, while allowing infrastructure system operators to maintain system’s privacy and/or security. We define a tiered supply/demand interface, where the amount of information provided by individual systems can range from system-level to component-level post-disaster evolution of resource supply and demand, assessed using expert opinion or confidential in-house models. The proposed supply/demand interfaces are illustrated in a semi-virtual case study, assessing the seismic resilience of North-East San Francisco, focusing on the effect of interdependent infrastructure on the functional recovery of residential buildings.
  • Hybrid simulation of bridge response under three-dimensional earthquake excitation
    Item type: Other Conference Item
    Terzic, V.; Stojadinovic, Bozidar (2011)
  • Lookahead strategies for planning of post-disaster emergency restoration of road networks
    Item type: Journal Article
    Sun, Li; Shawe-Taylor, John; Yang, Siyao; et al. (2025)
    International Journal of Disaster Risk Reduction
    Post-disaster emergency restoration (ER) has emerged as a promising approach to enhancing the resilience of critical infrastructure systems (CISs). However, devising optimal ER plans immediately after real-world disasters is inherently challenging due to the vast state space of modern CISs. To address this challenge, this paper proposes a range of strategies to guide these campaigns, with a particular focus on road networks (RNs) under earthquake disasters. Initially, a set of heuristic-based, easy-to-interpret strategies has been developed. Building on prior research, this study investigates the integration of lookahead search, examining its potential to refine and adapt these heuristics to meet diverse optimization objectives of ER campaigns. To operationalize these strategies, a multi-agent-based model (MABM) is established, wherein each restoration group is modelled as an autonomous agent, guided by the proposed planning strategies. The applicability of the model is demonstrated by its implementation in a real-world RN under catastrophic earthquake scenarios. The impact of various strategies on the effectiveness of the ER campaign is examined and elucidated. Notably, the planning strategy that combines a newly developed, accessibility-based heuristic with lookahead proves effective in sequentially balancing the trade-off between the accessibility and criticality of collapsed bridges. Based on the case study result, this approach consistently fulfils diverse optimization objectives across a range of earthquake scenarios, establishing it as the benchmark planning strategy of the post-shock ER of RNs.
  • Use of Soft Layers to Modify the Response of Masonry Structures: State-Of-The-Art Review
    Item type: Conference Paper
    Petrovic, Milos; Mojsilović, Nebojša; Stojadinovic, Bozidar (2016)
    Proceedings of 12th North American Masonry Conference
  • Spectral Content of Induced vs Natural Seismicity
    Item type: Other Conference Item
    Whyte, Catherine A.; Stojadinovic, Bozidar (2014)
Publications 1 - 10 of 283