Seismic performance of masonry buildings subjected to synthetic ground motions

Download
2019
Koç, Ahmet Bahadır
Over the centuries, strong seismic activities have occurred with uncertain frequencies in the world which caused earthquake-prone regions to be severely influenced in terms of structural damage and economic losses. Therefore, seismic assessment approaches have been developed to minimize the vulnerability of structures, to carry out pre-earthquake mitigation planning and to mitigate economic losses. This study mainly focuses on the performance estimation of unreinforced masonry (URM) structures using synthetic ground motions, which are based on the simulated 1999 Düzce Earthquake. The performance values of the structural parameters for URM structures have been obtained in accordance with earthquake design specifications and literature reviews and also represent their local characteristics. The equivalent single-degree-of-freedom (SDOF) models are generated to simplify inelastic dynamic analysis by using these parameters. The synthetic ground motion records are generated in the case study Düzce region, by considering different earthquake scenarios, soil conditions and source-to-site distances. The seismic responses of structural simulations represent base shear versus displacement relationship. By comparing the results of displacement obtained from inelastic dynamic analyses and the pre-defined limit states, the damage states (DS) of URM structures are determined. At the end of the study, the sensitivity of the structural parameters, the estimation of performance levels under different magnitude and PGA values and the relationships between DS and independent variables, which comprise seismological and structural parameters, are carried out and the obtained results are interpreted by using probabilistic and statistical approaches.

Suggestions

Seismic Risk Assessment of Masonry Buildings in Istanbul for Effective Risk Mitigation
Erberik, Murat Altuğ (SAGE Publications, 2010-11-01)
Unreinforced and non-engineered masonry buildings are highly vulnerable to seismic hazard and constitute a significant percentage of earthquake losses, including both casualties and economic losses. This study presents an engineering application on seismic safety assessment of unreinforced masonry (URM) buildings in Istanbul, Turkey, a metropolitan city under very high seismic risk. Nearly 20,000 masonry buildings were examined through a two-stage assessment procedure in order to identify the addresses of t...
Seismic fragilities for non-ductile reinforced concrete frames - Role of aleatoric and epistemic uncertainties
Çelik, Ozan Cem (2010-01-01)
Seismic fragilities are essential to earthquake loss estimation and performance-based earthquake engineering in regions of high seismicity. Construction practices for frames in regions of moderate seismicity are quite different, and such frames have received less attention in the literature. Fragilities for performance levels identified in recent seismic regulations are developed herein for reinforced concrete frames designed for gravity load in low-seismic regions using probabilistic non-linear finite elem...
Seismic response of hunchbacked block type gravity quay walls
Yuksel, Z. Tugce; YÜKSEL, Yalçın; Çetin, Kemal Önder; ÇEVİK, Esin (2017-10-01)
Earthquakes near major cities may cause big social and economic impacts. Damages to port facilities may cripple the economy. The past twenty years' experience has proven the high vulnerability of the port facilities. This fact, along with the economic importance of port structures, indicates the need for better seismic design approaches for berth structures and cargo handling facilities. In the recent decades, there have been many incidences of failure of gravity type quay walls. These failures have stimula...
SEISMIC HAZARD ANALYSIS WITH RANDOMLY LOCATED SOURCES
Yücemen, Mehmet Semih (1994-03-01)
Demarcation of areal and linear seismic sources involves a certain degree of uncertainty and this should be reflected in the final seismic hazard results. The uncertainty associated with the description of the geographical coordinates of a source zone boundary is modeled by introducing the concept of 'random boundary', where the location of the boundary is assumed to exhibit a spatial bivariate Gaussian distribution. Here the mean vector denotes the best estimate of location and the variance reflects the ma...
Seismic risk assessment of gravity load designed reinforced concrete frames subjected to mid-America ground motions
Çelik, Ozan Cem (American Society of Civil Engineers (ASCE), 2009-03-24)
The infrequent nature of earthquakes in the Central and Eastern United States (CEUS), and the fact that none with intensity comparable to the New Madrid sequence of 1811-12 has occurred in the past century, have caused the earthquake hazard in the CEUS to be neglected until quite recently. The performance of reinforced concrete (RC) frames in the CEUS may be deficient if they are subjected to earthquakes that are believed to be plausible in the New Madrid Seismic Zone (NMSZ). This study presents a set of pr...
Citation Formats
A. B. Koç, “Seismic performance of masonry buildings subjected to synthetic ground motions,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Civil Engineering., Middle East Technical University, 2019.