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  Mehmet Uzun
  Challenge Journal of Concrete Research Letters (2024) 15(3) 82-89
  In this study, we explore the possibility of using sisal fibers as an environmentally-friendly reinforcing agent for foam concrete. We aim to improve its physical properties by combining environmental friendliness with engineering practicality to create a dura...
• Evaluation of the lightweight foamed concrete characteristics
  Zeinab A. Etman, Samar A. Rokbah
  Challenge Journal of Concrete Research Letters (2023) 14(3) 59-68
  The purpose of this paper is to assess the properties of light weight foamed concrete. In this research, two phases are investigated. The first stage explored the characteristics of fresh and hardened foamed concrete using a foaming agent. The following parame...
• Optimization of reinforced concrete beam using hybrid algorithms with multi-objective function as CO2 emission and cost
  Muhammed Çoşut, Gebrail Bekdaş, Sinan Melih Nigdeli
  Challenge Journal of Concrete Research Letters (2023) 14(4) 96-106
  In this study, algorithms with two objective functions are defined considering the TS500 (2000) (Reinforced concrete structures design and construction rules) and TBDY (2018) (Turkey Building Earthquake Regulation) standards for rectangular beam design. These ...
• Optimum design of reinforced concrete beam sections with JAYA algorithm
  Yasin Duysak, Sinan Melih Nigdeli, Gebrail Bekdaş
  Challenge Journal of Concrete Research Letters (2024) 15(4) 134-141
  Section design is an important process for designing reinforced concrete structures because of the existence of factors such as bearing capacity and cost. After defining the initial cross sections for reinforced concrete elements, reinforcement amounts are cal...
• Optimal metaheuristic design of CFRP wrapping for enhancing the shear capacity of reinforced concrete columns
  Ammar Khalbous, Gebrail Bekdaş, Sinan Melih Nigdeli, Aylin Ece Kayabekir
  Challenge Journal of Structural Mechanics (2026) 12(1) 55-64
  Reinforced concrete (RC) columns are prone to brittle shear failure under lateral loads like earthquakes, especially in older structures. Carbon fiber reinforced polymer (CFRP) wrapping effectively enhances shear capacity, ductility, and energy dissipation. Th...