Consequence-based robustness assessment of a steel truss bridge

Olmati, Pierluigi; Gkoumas, Konstantinos; Brando, Francesca; Cao, Liling

doi:10.12989/scs.2013.14.4.379

Cited by 17 publications

(9 citation statements)

References 27 publications

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“…As in the case of the undamaged state, the residual strength (pushover) analysis is carried out under horizontal loads having a triangular distribution along the height of the building. This choice is made with two motivations in mind [31]: i) horizontal loads can activate both horizontal and vertical load bearing structural systems of the building and ii) direct reference is made to the unlikely eventuality that a seismic aftershock occurs after an explosion. This event is possible in the case that the explosion occurs after a seismic main shock (e.g.…”

Section: Steel Buildings and Robustnessmentioning

confidence: 99%

Ultimate Capacity of Diagrid Systems for Tall Buildings in Nominal Configuration and Damaged State

Milana¹,

Olmati²,

Gkoumas

et al. 2015

Period. Polytech. Civil Eng.

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One of the evocative structural design solutions for tall buildings is recently embraced by the diagrid (diagonal grid) IntroductionIt is a common understanding that society requires enhanced structures for the people's needs. Besides safety and functional requirements collectively defined in the so-called Performancebased Design [1], today the attention focuses on the sustainability in the broader and profound sense of the word [2].Sustainability in the urban and built environment is a key issue for the wellbeing of people and society. Sustainable development, defined as the "development that meets the needs of the present without compromising the ability of the future generations to meet their own needs" [3] is nowadays a first concern for public authorities and the private sector. Sustainable design leads to innovation since it demands inventive solutions, and eventually is supported by a cultural shift, evident from national level reviews and surveys [4,5]. Sustainability issues are wide-ranging in the building industry but the main focus is the reduction of energy consumption in construction and use.In construction, steel has developed as a material of choice and offers a wide range of solutions that can make buildings more energy efficient, less costly to operate and more comfortable. Several green solutions, aiming at the minimization of structural steel, have been developed in the last few years. Among those, the diagrid structural system is considered as a promising solution for high-rise steel buildings. Diagrid is a perimeter structural configuration characterized by a narrow grid of diagonal members that are involved both in gravity and in lateral load resistance that has emerged as a new design trend recently for tall-shaped complex structures due to aesthetics and structural performance [6,7].Since diagrid requires less structural steel than a conventional steel frame, it provides for a more sustainable structure.This study focuses on the overall structural performance, the ultimate capacity and the robustness of diagrid tall buildings, using numerical (FE) methods. More precisely, the paper is organized in the following manner. Section 2 provides details on diagrid for high-rise buildings. Section 3 outlines structural robustness approaches for steel buildings. Section 4 introduces the case study steel high-rise building and the performed Finite Element (FE) numerical analyses. Finally, Section 5 provides some

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Section: Steel Buildings and Robustnessmentioning

confidence: 99%

Ultimate Capacity of Diagrid Systems for Tall Buildings in Nominal Configuration and Damaged State

Milana¹,

Olmati²,

Gkoumas

et al. 2015

Period. Polytech. Civil Eng.

Self Cite

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“…Furthermore, two approaches exist to take into account the interaction between the blast load and the structural component: a coupled and an uncoupled approach [17]. Decomposing a system (environment, structure, and actions/loads) is usual in carrying out structural analyses in order to organize the qualitative and quantitative assessment in various sub-problems, see for example the work of Petrini et al [18,19], Sgambi et al [20], Gentili et al [21], and Olmati et al [22].…”

Section: Numerical Investigationmentioning

confidence: 99%

Blast Resistance Assessment of Concrete Wall Panels: Experimental and Numerical Investigations

Giovino¹,

Olmati

Garbati³

et al. 2014

International Journal of Protective Structures

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The cladding system of a building is crucial for protecting people and equipment against external explosions. Both experimental and numerical investigations are carried out in order to evaluate the resistance of precast concrete cladding wall panels against man-made attacks. The cladding system under investigation is a precast concrete wall panel for using in police station facilities that particularly need to be protected against man-made or subversive attacks. A total of three precast concrete cladding wall panels are studied. The panels are 3500 mm long and 1500 mm wide; and one is 150 mm thick while the other two are 200 mm thick. The longitudinal reinforcement consists of a single layer of reinforcement bars located in the middle of the cross section. The blast demand is due to the detonation of 3.5 and 5.5 kg of TNTeq, and the numerical simulations are carried out using the finite element software LS-Dyna©. Details of the experimental and numerical investigations are shown, and a discussion on the obtained results is provided.

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“…In addition, the multiscale modeling method was validated by comparing with the traditional scale modeling method and full-scale modeling method. Olmati et al [16] assessed robustness of the I-35W Minneapolis steel truss bridge.…”

Section: Introductionmentioning

confidence: 99%

Ultimate Capacity of Narrow Type Steel Box Section for Railway Self-Anchored Suspension Bridge Under Bias Compression

2019

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The steel box section, with its excellent performance, has been extensively applied in self-anchored suspension bridges. The ultimate capacity of such sections, which needs to be exactly predicted, is crucial to the safety of the whole bridge. A narrow type steel box section (NTSBS) with width to height ratio of 4.18 is deployed in Egongyan Rail Special Bridge, which is a railway self-anchored suspension bridge with 1120 m span in total. In order to comprehensively investigate the ultimate capacity of NTSBS, the behavior of NTSBS under the most unfavorable internal forces is herein studied by means of experiments and numerical simulations. Firstly, a representative steel box girder is selected to be an experimental rescale model and the most unfavorable internal forces are determined by computation analysis. Then, a load test is conducted on the rescale model of NTSBS girder. The experimental method is introduced, including the loading method and layout of measuring points. During this loading procedure, the prestress loss of the steel strands in the self-loading system is considered in order to improve the accuracy of the actual eccentric loading. Subsequently, a finite element (FE) model meshed by shell element is validated using the test results and is used to investigate effects of residual stress and geometric imperfections. Finally, the FE method is extrapolated to the full scale model, the actual ultimate capacity is obtained, and effect of geometric imperfections of mid webs and failure mechanism are investigated.

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Consequence-based robustness assessment of a steel truss bridge

Cited by 17 publications

References 27 publications

Ultimate Capacity of Diagrid Systems for Tall Buildings in Nominal Configuration and Damaged State

Ultimate Capacity of Diagrid Systems for Tall Buildings in Nominal Configuration and Damaged State

Blast Resistance Assessment of Concrete Wall Panels: Experimental and Numerical Investigations

Ultimate Capacity of Narrow Type Steel Box Section for Railway Self-Anchored Suspension Bridge Under Bias Compression

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