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Optimal kernel density estimation by statistical modeling with random censoring of observations

Abstract

The problems of nonparametric estimation of the probability of failure-free operation and the density distribution function of the operating time of some physical device are considered. Randomly right-censored observations are used. Estimates of a complex structure are constructed: multiplying, exponential, as well as power estimates and an estimate with modification. New estimates for the distribution density using the kernel method are proposed. Tables of the optimal choice of smoothing parameters obtained using statistical modeling are presented.

article Article

date_range 2024

language Russian

link Link of the paper

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Abdushukurov Abdurakhim

Bozorov Sukhrob

Mansurov Dilshod

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Featured Keywords

multiplier estimation

exponential estimation

power estimators

kernel estimation

random censoring

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Assessment of reinforced concrete building damages following the Kahramanmaraş earthquakes in Malatya, Turkey (February 6, 2023)

Abstract

Earthquakes of magnitude Mw = 7.7 and Mw = 7.6 hit the city of Kahramanmaraş (Turkey) on 6 February 2023. These earthquakes caused serious damage in 11 provinces in Turkey resulting in over 50,000 deaths and huge economic losses with the collapse of thousands of buildings. Two consecutive devastating earthquakes have severely damaged the reinforced concrete building stock located in Malatya. There are many reasons reinforced concrete structures suffer damage under the influence of seismic loads. These reasons can be listed as material and section properties that do not comply with earthquake codes, workmanship defects, ground parameters that are not considered and design errors, as seen in field investigations after earthquakes in Turkey in the past. In this research, a field study was conducted on reinforced concrete buildings damaged after the earthquakes in Malatya province. The causes of structural damages in reinforced concrete buildings between 6–26 years of age were assessed in terms of design and material defects. The structural damages were mainly caused due to insufficient stirrups in structural members, short column, strong beam–weak column, failures of infill walls, soft story type collapse, poor concrete quality, and reinforcement corrosion. In addition to the field investigation, the spectrum relationships created using raw acceleration data obtained from DEMP (Disaster and Emergency Management Presidency) stations in Malatya province were compared with the design response spectra.

article Article

date_range 2024

language English

link Link of the paper

Collapsed buildings

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