scholarly journals Model updating of strategic building structures under real earthquake loading

2013 ◽  
pp. 819-820 ◽  
Keyword(s):  
Model Updating ◽  
Building Structures ◽  
Earthquake Loading ◽  
Real Earthquake

scholarly journals Deterioration assessment of buildings using an improved hybrid model updating approach and long-term health monitoring data

2018 ◽  
Vol 18 (1) ◽  
pp. 5-19 ◽  
Author(s):  
Andy Nguyen ◽  
KA Tharindu Lakshitha Kodikara ◽  
Tommy HT Chan ◽  
David P Thambiratnam
Keyword(s):  
Hybrid Model ◽  
Health Monitoring ◽  
Model Updating ◽  
Deterministic Model ◽  
Monitoring Data ◽  
Building Structures ◽  
Loading Conditions ◽  
Hybrid Techniques ◽  
Deterioration Assessment

In recent years, it has become increasingly important to develop methodologies for reliable deterioration assessment of civil structures over their life cycle to facilitate maintenance and/or rehabilitation planning processes. Several approaches have been established to address this issue mainly using Bayesian probabilistic model updating techniques with some capability to incorporate uncertainties in the updating process. However, Bayesian model updating techniques are often found to be complex and computationally inefficient as opposed to their deterministic counterparts such as conventional or hybrid techniques of sensitivity-based model updating. Nevertheless, the deterministic model updating techniques have not been well developed for sophisticated assessment applications such as deterioration evaluation. To address these issues, this article presents a novel methodology for deterioration assessment of building structures under serviceability loading conditions, based upon an improved hybrid model updating approach incorporating the use of long-term monitoring data. This is first realized by a simple but effective scheme to simulate the deterioration mechanism in serviceability loading conditions before enhanced with innovative solutions to classify structural elements as well as to handle measurement and updating uncertainties in a meaningful way. The effectiveness of the established methodology is illustrated through a benchmark 10-story reinforced concrete building which is equipped with a long-term structural health monitoring system.

STIFF vertical seismic absorbers

2021 ◽  
pp. 107754632110016
Author(s):  
Konstantinos A Kapasakalis ◽  
Ioannis A Antoniadis ◽  
Evangelos J Sapountzakis
Keyword(s):  
Seismic Isolation ◽  
Ground Motions ◽  
Dynamic Performance ◽  
Negative Stiffness ◽  
Seismic Load ◽  
Building Structures ◽  
Industrial Facilities ◽  
Effective Technology ◽  
Real Earthquake ◽  
Isolation Systems

Seismic isolation is proven to be an effective technology for seismic protection of building structures, equipment, and industrial facilities. The majority of the existing isolation systems and techniques are related to horizontal ground motions, whereas there are only a few vertical isolation systems. The main reason is because of the conflict concerning the demand for isolation stiffness. More specifically, a vertical isolated system must have sufficient vertical rigidity to sustain the weight of the isolated object/system and retain the static vertical deflection in reasonable limits. On the other hand, the isolated system must also have enough flexibility to isolate the accelerations. In order to overcome this difficulty, a novel vertical seismic absorber system is proposed, that combines negative stiffness-driven absorbers with inerters. The inerter manages to reduce the frequency of the system, without weakening the structure or increasing the seismic load. At the same time, the effective damping is significantly increased with the KDamper. This way, the dynamic behavior of the system is improved, in terms of absolute accelerations, and simultaneously, the static settlements are retained at any desired level. The design of the vertical seismic absorber is based on engineering criteria, and the excitation input is selected according to the seismic design codes. The dynamic performance of the vertical seismic absorber is also evaluated with real earthquake records, using a realistic displacement-dependent configuration for the realization of the negative stiffness element. Finally, the detuning phenomena are observed and discussed via sensitivity analysis.

scholarly journals Comprehensive Review of Optimal and Smart Design of Nonlinear Building Structures With and Without Passive Dampers Subjected to Earthquake Loading

2021 ◽  
Vol 7 ◽  
Author(s):  
Izuru Takewaki ◽  
Hiroki Akehashi
Keyword(s):  
Optimal Design ◽  
Ground Motions ◽  
Seismic Loading ◽  
Building Structures ◽  
Earthquake Loading ◽  
Comprehensive Review ◽  
Building Frames ◽  
Earthquake Ground Motions ◽  
Passive Dampers ◽  
Made In

The optimal and smart design of nonlinear building structures with and without passive dampers subjected to earthquake loading is of great concern in the structural design of building structures. The research started around 1980 and many investigations have been conducted. A comprehensive review on this subject is made in this article. After the description of essential features of the optimal design problem of nonlinear building structures under earthquake ground motions, analysis types of optimization problems are explained and the significance of the dynamic pushover analysis is discussed from the viewpoint of analysis of limit states under earthquake ground motions of magnitude larger than the code-specified level. Then, the categorization by the response of frames and dampers was made. In this categorization, several subjects are discussed first: 1) Optimal design of bare nonlinear building frames under seismic loading, 2) Optimal design of nonlinear dampers for elastic building frames under seismic loading, 3) Optimal design of linear dampers for nonlinear building frames under seismic loading, 4) Optimal design of nonlinear building frames with specified nonlinear dampers under seismic loading, 5) Optimal design of nonlinear dampers for specified nonlinear building frames under seismic loading, 6) Simultaneous optimization of elastic-plastic building structures and passive dampers. Finally, the classification of researches in view of solution strategies is conducted for providing another viewpoint.

Application of the wavelet transform in filtering the noise of real earthquake accelerograms

2021 ◽  
pp. 19-27
Author(s):  
Svetlana V., Kharlanova ◽  
Vladimir L. Kharlanov
Keyword(s):  
Wavelet Transform ◽  
Comparative Analysis ◽  
Input Data ◽  
Dynamic Coefficient ◽  
Building Structures ◽  
Deterministic Analysis ◽  
Filtering Algorithm ◽  
Source Data ◽  
Real Earthquake ◽  
Earthquake Accelerograms

In the deterministic analysis of building structures, real accelerograms are used as input data. Very often, only instrumental recordings of accelerograms that are not cleared of noise are publicly available. Such accelerograms cannot be used directly in the analysis of building structures. Various broadband filters are used to adjust the instrumental recordings of accelerographs. This article discusses the possibility of applying filters based on the wavelet transform. The technique of the algorithm of filtering from the noise of the source data is considered. As an efficiency of this filtering algorithm, a comparative analysis of the dynamic coefficient and the energy criteria of the pulse and Arias for the corrected and instrumental accelerograms is carried out.

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