Evaluation of structural parameters properties of low and mid-rise reinforced concrete buildings

This study examines the relation between maximum seismic displacements and residual displacements for reinforced concrete building structures. In order to achieve a reliable relationship between these critical structural parameters for the seismic performance of concrete buildings, an extensive parametric study is conducted by examining the nonlinear behavior of numerous planar framed structures. In this work, dynamic inelastic analyses are executed to investigate the seismic behavior of two sets of frames. The first group consists of four planar frames which have been designed for seismic and vertical loads according to modern structural codes while the second group also consists of four frames, which have been designed for vertical loads only, in order to examine older structures that have been designed using codes with inadequate seismic provisions. These two sets of buildings are subjected to various earthquakes with different amplitudes in order to develop a large structural response databank. On the basis of this wide-ranging parametric investigation, after an appropriate statistical analysis, simple empirical expressions are proposed for a straightforward and efficient evaluation of maximum seismic displacements of reinforced concrete buildings structures from their permanent deformation. Permanent displacements can be measured in-situ after strong ground motions as a post-earthquake assessment. It can be concluded that the measure of permanent deformation can be efficiently used to estimate the post-seismic performance level of reinforced concrete buildings.

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Response of earthquake-resistant reinforced-concrete buildings to blast loadingThis article is one of a selection of papers published in the Special Issue on Blast Engineering.

Canadian Journal of Civil Engineering ◽

10.1139/l09-089 ◽

2009 ◽

Vol 36 (8) ◽

pp. 1378-1390 ◽

Cited By ~ 7

Author(s):

Murat Saatcioglu ◽

Togay Ozbakkaloglu ◽

Nove Naumoski ◽

Alan Lloyd

Keyword(s):

Reinforced Concrete ◽

Blast Resistance ◽

Structural Parameters ◽

Progressive Collapse ◽

Structural Response ◽

Charge Weight ◽

Blast Loads ◽

Reinforced Concrete Buildings ◽

Collapse Potential ◽

Concrete Buildings

Recent bomb attacks on buildings have raised awareness about the vulnerability of structures to blast effects. The resiliency of structures against blast-induced impulsive loads is affected by structural characteristics that are also important for seismic resistance. Deformability and continuity of structural elements, strength, stiffness, and stability of the structural framing system and resistance to progressive collapse are factors that play important roles on the survivability of buildings under both blast and seismic loads. The significance of these structural parameters on blast resistance of reinforced concrete buildings is assessed through structural analysis. Both local element performance and global structural response are considered while also assessing the progressive collapse potential. The buildings under investigation include 10-storey moment resisting frames with or without shear walls. The blast loads selected consist of different charge-weight and standoff distance combinations. The results are presented in terms of ductility and drift demands. They indicate improved performance of seismic-resistant buildings when subjected to blast loads, in terms of local column performance, overall structural response, and progressive collapse potential.

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Dynamic Characteristics of Multi-Story Reinforced Concrete Buildings

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.249.235 ◽

2016 ◽

Vol 249 ◽

pp. 235-240 ◽

Cited By ~ 1

Author(s):

Jónas Thór Snaebjornsson ◽

Eythor Rafn Thorhallsson

Keyword(s):

Reinforced Concrete ◽

Natural Frequencies ◽

Structural Parameters ◽

Structural Response ◽

Design Guidelines ◽

Reinforced Concrete Buildings ◽

Structural Behaviour ◽

Measurement Systems ◽

Concrete Buildings ◽

International Data

Having a realistic estimate of structural parameters, such as natural frequency and damping is important for design purposes. In this study, available wind and earthquake induced acceleration data from four multi-story reinforced concrete buildings are utilized to examine structural behaviour and system parameters. The buildings measurement systems are described and the recorded structural response data presented. The data stems from two different sources of excitation, i.e. wind and earthquake, and are recorded for various excitation levels and environmental conditions. System identification analyses of the buildings are carried out applying previously verified parametric methods to the recorded data. The natural frequencies and critical damping ratios established from the recordings are compared to values estimated using design guidelines and international data compilations for reinforced concrete structures of similar type. Considerable variability is discovered between the different estimation formulas and the observed natural frequencies of the buildings are found to lie at the upper limit of the prediction formula.

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