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<p>The durability of reinforced concrete (RC) structures under varying environmental and loading conditions remains a critical concern in structural engineering. This study explores the effects of thermal–humidity conditions (elevated humidity and temperature) on the propagation of crack in ferrocement-laminated, haunched-type RC beams subjected to static and cyclic loading. Unifying laboratory testing and numerical simulations, static loading and thermal–humidity fatigue tests were performed to assess the coupled influence of environmental factors and repeated loading on beam performance. A total of 26 specimens—comprising 2 rectangular and 24 haunched beams—were tested, incorporating variations in haunch inclination angles (6° and 14°), depth-to-width ratios (D/B = 1.0 and 1.5), and ferrocement reinforcement volume fractions (2.192%, 4.384%, and 6.576%). Results indicated that cast-in-situ bonded ferrocement laminates significantly enhanced fatigue resistance and load-carrying capacity—up to 35% improvement at the initial cracking stage—compared to traditional RC beams and those strengthened with epoxy-bonded plates, which were prone to interfacial debonding. Numerical simulations using ABAQUS, considering material nonlinearity and environmental effects, supported the experimental findings. Digital Image Correlation (DIC) techniques were employed to monitor real-time crack propagation, while stress intensity factors (SIFs) revealed that temperature had a more pronounced effect on fatigue crack growth than relative humidity. Modified Paris Law formulations were proposed to quantify these environmental impacts. This research contributes to performance-based retrofitting strategies for RC beams in aggressive environments, emphasizing the efficacy of ferrocement strengthening under thermal-humidity fatigue conditions and its role in extending structural service life.</p>

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Investigation of thermal–humidity effects on ferrocement-strengthened RCC haunched beams under cyclic loading: an experimental and numerical approach

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Badrinarayan Rath,
  • Ayalew Abate

摘要

The durability of reinforced concrete (RC) structures under varying environmental and loading conditions remains a critical concern in structural engineering. This study explores the effects of thermal–humidity conditions (elevated humidity and temperature) on the propagation of crack in ferrocement-laminated, haunched-type RC beams subjected to static and cyclic loading. Unifying laboratory testing and numerical simulations, static loading and thermal–humidity fatigue tests were performed to assess the coupled influence of environmental factors and repeated loading on beam performance. A total of 26 specimens—comprising 2 rectangular and 24 haunched beams—were tested, incorporating variations in haunch inclination angles (6° and 14°), depth-to-width ratios (D/B = 1.0 and 1.5), and ferrocement reinforcement volume fractions (2.192%, 4.384%, and 6.576%). Results indicated that cast-in-situ bonded ferrocement laminates significantly enhanced fatigue resistance and load-carrying capacity—up to 35% improvement at the initial cracking stage—compared to traditional RC beams and those strengthened with epoxy-bonded plates, which were prone to interfacial debonding. Numerical simulations using ABAQUS, considering material nonlinearity and environmental effects, supported the experimental findings. Digital Image Correlation (DIC) techniques were employed to monitor real-time crack propagation, while stress intensity factors (SIFs) revealed that temperature had a more pronounced effect on fatigue crack growth than relative humidity. Modified Paris Law formulations were proposed to quantify these environmental impacts. This research contributes to performance-based retrofitting strategies for RC beams in aggressive environments, emphasizing the efficacy of ferrocement strengthening under thermal-humidity fatigue conditions and its role in extending structural service life.