En tr Geosynthetics; Geotextile, geomembrane, geonet, geocomposite and similar products are materials that provide the functions of natural building materials (sand, gravel, clay, etc.). Developments in the production network have increased the use of geosynthetics in the construction sector. Geosynthetics are widely used in deep excavation and road projects. In geotechnical engineering, geosynthetics are used especially in solving slope stability problems. The high stresses and deformations resulting from the stability losses of the slopes have led the engineers to develop slope reinforcement systems. In this study, geotextile was used in order to affect long term behavior of slope stability and to counter the underground water level. Samples both with and without geotextiles with the same slope angle were resolved by limit equilibrium method in the study. In each analyzes, the ground deformation and factor of safety were compared. The contribution of geotextiles to increasing bearing capacity of soil is emphasized. Geosentetik; geotekstil, geomembran, geonet, geokompozit ve buna benzer ürünler, doğal yapı malzemelerinin (kum, çakıl, kil vb…) gördüğü işlevleri sağlayan malzemelerdir. Üretim ağındaki gelişmeler, inşaat sektöründe geosentetik kullanım alanlarını arttırmıştır. Geosentetiklerin, derin kazı ve yol projelerinde kullanım alanları oldukça yaygındır. Geoteknik mühendisliğinde geosentetikler özellikle şev stabilitesi problemlerinin çözülmesinde kullanılmaktadır. Şevlerin stabilite kayıpları sonucunda oluşan yüksek gerilme ve deformasyonlar mühendisleri şev güçlendirme sistemleri geliştirmeye yönlendirmiştir. Şev stabilitesinin uzun dönemdeki davranışını etkilemek ve yer altı su seviyesine karşı koymak amacıyla bu çalışmada geotekstil kullanılmıştır. Çalışmada, aynı şev açılarına sahip geotekstil kullanılan ve kullanılmayan örnekler limit denge yöntemi ile çözümlenmiştir. Her iki analizde meydana gelen zemin deformasyonları ve güvenlik katsayıları karşılaştırılmıştır. Geotekstillerin zemin taşıma gücünün artırılmasına olan katkısı vurgulanmıştır.

Due to the increasing population, the rapid consumption of natural resources has revealed the necessity of protecting nature from people. Increasing building stock due to population growth has triggered climate change. The energy and natural resources consumed during production in the construction sector have created important environmental problems such as global warming and climate change in the sector. Greenhouse gas emissions caused by construction materials can be considered as one of the main causes of climate change problems and emphasizes the necessity of considering environmental effects. Greenhouse gas is one of the most important factors affecting the ecological environment and climate change, as it is one of the gases with the highest carbon dioxide emission rate. Concrete and steel used in the construction industry are among the materials that have a negative impact on climate change. This study revealed the effects of waste materials used in the construction industry on the problem of climate change and the importance of promoting the efficient use of energy resources for the management of this problem. In addition, this study emphasized the importance of focusing on sustainable structures in order to leave a cleaner and healthier environment for future generations, and that priority should be given to developing environmentally friendly materials.

The 2023 Kahramanmaraş earthquake sequence, consisting of two major earthquakes ( M _w 7.8 and M _w 7.5) that occurred on the same day in southeastern Türkiye, caused extensive structural damage and severe site‐related impacts across the affected region. This study investigates the post‐earthquake mechanical performance and durability characteristics of concrete and reinforcement samples collected from earthquake‐damaged reinforced concrete (RC) structures in the Antakya and Düziçi regions. Laboratory analyses including capillary water absorption, ultrasonic pulse velocity (UPV), compressive strength, and tensile tests were conducted to evaluate earthquake‐induced material deterioration and residual structural integrity. The results revealed that concretes from Düziçi exhibited higher sorptivity, lower UPV values, and compressive strengths generally below 20 MPa, indicating severe microcracking and increased pore connectivity. In contrast, the Antakya specimens maintained comparatively denser matrices and higher compressive strength values (~25 MPa). The findings demonstrate that intense seismic loading, together with local geological and construction‐related conditions, significantly influenced the deterioration behavior of RC materials. The study highlights the importance of comprehensive post‐earthquake material characterization for reliable damage assessment and for improving future seismic design, rehabilitation, and resilience strategies in earthquake‐prone regions.

Under repeated seismic loads during an earthquake, increase of pore water pressure in cohesionless, saturated and loose soils leads to decreased shear strength and therefore liquefaction occurs. Literature reports of numerous cases involving damage due to liquefied soil which makes the pile behaviour and performance in liquefied soil even more important. It is possible to investigate the behaviour of piles located in the liquefied soil under inertial loads using linear spring model, p-y method or numerical analyses and a suitable liquefaction constitutive model in time. This study investigates the behaviour of two piles, located in the foundation of the "Niigata Family Courthouse" which was damaged during the Niigata earthquake of 1964, under inertial loads in liquefied soil. The soil profile identified for this case and the piles are analyzed using p-y method and linear spring approach. Pile deformations and bending moments calculated with these two methods were compared.