Processed waste tires can be used as additives for geotechnical applications in earthquake-prone areas. The increasing use of waste tires additives requires a better understanding of their dynamic behaviors. Processed waste tires as granular and fiber-shaped rubber particles under the same experimental conditions have not been studied before. The main purpose of this study is to carry out these experiments to determine the effects of two different processing techniques on the shear modulus and damping ratios of the mixtures. It is also the first time that the effects of fiber-shaped rubber particle inclusions are determined in detail. In addition, the results of similar tests using different processed waste tires were evaluated. The effects of the processed waste tires are given by evaluating the literature and this study together. It has been found that depending on the size, aspect ratio and content of the rubber material, the type of processing can significantly affect the dynamic properties of the mixture. The tested materials may be suitable as base isolation material. Of all the studies evaluated, the highest damping ratio was obtained with granulated rubber inclusions.

Two earthquakes with moment magnitudes of 7.7 and 7.6 occured on February 6, 2023, at 04:17 a.m. (with local time, GMT+3) in Kahramanmaraş-Ekinözü Pazarcık and at 13:24 p.m. (with local time, GMT+3) in Kahramanmaraş-Elbistan, respectively, in Turkey. The earthquake was felt in a wide area within Turkey and caused structural destructions and heavy damage of buildings, especially in eleven cities including Adana, Adıyaman, Diyarbakır, Gaziantep, Hatay, Kahramanmaraş, Kilis, Malatya, Osmaniye, Şanlıurfa and Elazığ. The aim of this study was to present the detailed field investigation in Malatya province which was one of the most affected city in the region. The strong ground motion records have been analyzed and PGA distribution maps were presented. Structural defects in damaged and collapsed buildings were examined, and design and manufacturing defects were examined. The performance of soil structures was examined, and the defects demonstrated were evaluated in the context of the geological environment. The study is essential in terms of evaluating the damage and possible causes of the building stock in Malatya city center and its districts after the earthquake. In this sense, a holistic evaluation has been carried out, which can be a useful resource for Anatolian cities with typical building characteristics.

The 7.7 and 7.6 magnitude Pazarcık and Elbistan earthquakes that struck Kahramanmaraş on 6 February 2023 caused widespread structural damage across many provinces and are considered rare in seismological terms. While many reinforced concrete (RC) buildings designed under current earthquake regulations sustained significant damage, some older RC buildings with outdated designs sustained only moderate damage. This study aims to analyze the seismic performance of such older RC buildings to understand why they did not collapse or suffer severe damage. An 8-story RC building in Adıyaman province, damaged by the earthquake, was considered for analysis. The region’s seismicity and local site conditions were assessed through borehole operations, geotechnical laboratory tests, and seismic field tests. The soil profile was modeled, and one-dimensional seismic site response analyses were performed using records from nearby stations (TK 4615 Pazarcık and TK 4612 Göksun stations) to determine the foundation-level earthquake record. Nonlinear static pushover analysis was carried out via SAP2000 and STA4CAD, utilizing site response analysis and test results taken from the reinforcement and concrete samples of the building. The findings, compared with the observed damage, provide insights into the performance of older RC buildings in this region.