Robustness of Frame Structures

The topic of this paper relates to the projects, forming the conception design and technology of construction of the temporary steel structures used for strengthening of deep excavations for Sofia metro Line -1 Extension Project from Sveta Nedelya Square to Vassil Levski Stadium. The excavation is supported by R.C. wall and pilot, which are additionally supported to keep vertical position by steel frames. The temporary steel construction is analysed as a frame structure using FEM in the light of robustness structures theory. The steel frames is from hot-rolled section in the range from HEB 300 to HEB1000, doubled and situated along the whole perimeter of the frame.

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“…Different aspects of structural robustness have been discussed in technical literature [2,5,6,[8][9][10][11][12][13][14].…”

Section: Robustness Of Structures and The Codesmentioning

confidence: 99%

14.04: Temporary steel structures: for strengthening of a large excavation for new metro in Sofia

et al. 2017

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“…According to this definition, structural robustness is a purely structural property in the sense that the cause and probability of local failure and thus also the nature, extent and probability of triggering accidental circumstances are immaterial. It is associated with the conditional probability P(C|D) [see also Val and Val 2006].…”

Section: Robustness and Collapse Resistancementioning

confidence: 99%

Progressive Collapse Nomenclature

Haberland¹,

Starossek²

2009

Structures Congress 2009

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“…Otherwise, if some accidental events can bring unacceptable negative consequences, the structure is said to be vulnerable to them. Moreover, since buildings are generally not expected to withstand huge events like nuclear explosions, the much debated concept of proportionality between action and consequences is often introduced (see e.g., Val and Val 2006 ) Structural robustness can be gathered either with structural and non-structural measures (e.g., security and barriers). Focusing on the former, one can distinguish between the measures aimed to reduce the probability that an accidental event produces direct damage and those aimed to reduce the probability of propagation of local damage.…”

Section: Introductionmentioning

confidence: 99%

Analogies between progressive collapse of structures and fracture of materials

Chiaia

Masoero

2008

Int J Fract

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The analogy between structural progressive collapse and Fracture Mechanics is consistent either for phenomenological, technological and theoretical aspects. In this paper a general energy criterion suitable for fracture in heterogeneous materials is applied to study the progressive collapse of simple structures with cohesive post peak behavior: elementary frames and fiber bundles. The analyses put into evidence some interesting scale effects induced by ductility and dynamics. In particular, a power law describing the decrease of the reduced dynamic critical load with the structural scale and a second order ductilebrittle transition, have been found. These results can be usefully applied in robustness oriented structural design. Moreover, the study of the influence of the extent of the starting damage in structures with different sizes suggests that, the elementary cells of complex framed structures can play a role similar to the microstructure of materials. In conclusion, a new approach to the problem of collapse into complex structures by means of the tools of Fracture Mechanics is proposed.

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Robustness of Frame Structures

Cited by 16 publications

References 10 publications

14.04: Temporary steel structures: for strengthening of a large excavation for new metro in Sofia

14.04: Temporary steel structures: for strengthening of a large excavation for new metro in Sofia

Progressive Collapse Nomenclature

Analogies between progressive collapse of structures and fracture of materials

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