A decision‐tree‐based algorithm for identifying the extent of structural damage in braced‐frame buildings

2021 ◽  
Author(s):  
Mojtaba Salkhordeh ◽  
Masoud Mirtaheri ◽  
Siavash Soroushian
Keyword(s):  
Decision Tree ◽  
Structural Damage ◽  
Braced Frame ◽  
Frame Buildings

scholarly journals Analysis of main causes of defects of multi-storey reinforced concrete frame buildings

2019 ◽  
Vol 279 ◽  
pp. 02008
Author(s):  
Vladimir Yamov ◽  
Zoya Belyaeva
Keyword(s):  
Reinforced Concrete ◽  
Structural Damage ◽  
Reinforced Concrete Frame ◽  
Braced Frame ◽  
Concrete Frame ◽  
Floor Slabs ◽  
Frame Buildings ◽  
Frame System ◽  
New Buildings ◽  
Building Owner

Multi-storey reinforced concrete frame buildings are widespread in Russia. Most of these buildings have braced frame system, where the main load-bearing elements are columns, beams and hollow floor slabs, and the spatial rigidity is provided by additional diaphragms, staircase and elevator section. Such buildings are easy to design and build and are quite multifunctional in purpose. The article on the basis of the authors’ experience in the survey examines the main defects in such buildings. The causes of typical defects can be divided into objective, technological and operational reasons. Usually, the cause of survey can be structural damage discovered by the building owner that is why often the survey is conducted during the emergency condition, which can be avoided, if inspections and monitoring of the structures technical state are regular. Also there is a necessity of improving the design methods of new buildings and strengthening of existing ones.

scholarly journals Increasing the Seismic Resistance of Wood-frame Buildings by Applying PU Foam as Thermal Insulation

2019 ◽  
Author(s):  
Wojciech Migda ◽  
Marcin Szczepański ◽  
Robert Jankowski
Keyword(s):  
Structural Damage ◽  
Residential Buildings ◽  
Substantial Reduction ◽  
Mineral Wool ◽  
Seismic Resistance ◽  
Insulation Material ◽  
Seismic Behaviour ◽  
Pu Foam ◽  
Frame Buildings ◽  
Wood Frame

Wood-frame buildings are very common in regions that are exposed to earthquakes. Most of residential buildings are constructed using this technology; therefore, the seismic resistance of them is really essential in order to prevent human losses and structural damage. The aim of the present article is to show the results of the detailed numerical FEM analysis focused on the seismic behaviour of the wood-frame house with different in-wall insulation materials. The results of the study clearly indicate that using polyurethane (PU) foam instead of mineral wool leads to the increase in the rigidity of the structure and, therefore, to the substantial reduction in the structural response under different seismic excitations. The results also show that, generally speaking, the level of reduction in the displacement response increases with the increase in the magnitude of the earthquake, which even furthermore benefits the application of PU foam as an insulation material. It has also been concluded that the method of using PU foam can be successfully applied not only in the newly constructed wood-frame houses but also in existing ones since replacing the mineral wool with PU foam is relatively easy and not so much expensive.

scholarly journals Damaged Flexibility Matrix Method for Damage Detection of Frame Buildings

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Luis S. Vaca Oyola ◽  
Mónica R. Jaime Fonseca ◽  
Ramsés Rodríguez Rocha
Keyword(s):  
Damage Detection ◽  
Matrix Method ◽  
Structural Damage ◽  
Numerical Models ◽  
Structural Elements ◽  
Structural Element ◽  
New Approach ◽  
Building Model ◽  
Flexibility Matrix ◽  
Frame Buildings

This study presents the damaged flexibility matrix method (DFM) to identify and determine the magnitude of damage in structural elements of plane frame buildings. Damage is expressed as the increment in flexibility along the damaged structural element. This method uses a new approach to assemble the flexibility matrix of the structure through an iterative process, and it adjusts the eigenvalues of the damaged flexibility matrices of each system element. The DFM was calibrated using numerical models of plane frames of buildings studied by other authors. The advantage of the DFM, with respect to other flexibility-based methods, is that DFM minimizes the adverse effect of modal truncation. The DFM demonstrated excellent accuracy with complete modal information, even when it was applied to a more realistic scenario, considering frequencies and modal shapes measured from the recorded accelerations of buildings stories. The DFM also presents a new approach to simulate the effects of noise by perturbing matrices of flexibilities. This approach can be useful for research on realistic damage detection. The combined effects of incomplete modal information and noise were studied in a ten-story four-bay building model taken from the literature. The ability of the DFM to assess structural damage was corroborated. Application of the proposed method to a ten-story four-bay building model demonstrates its efficiency to identify the flexibility increment in damaged structural elements.

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