Study on Low-Temperature Fatigue of Steel Structures and Fatigue Properties of Welds Under Shears Stress

Wang, Yuanqing; Gu, Haoyang; Liao, Xiaowei; Tianshen, Zhang; Zong, Liang

doi:10.18057/icass2018.p.055

Cited by 1 publication

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“…In summary, current research on the fatigue life and its reliability of concrete mainly focuses on exploring the impact of single factor, such as fixed mechanical loads, environmental temperature, and material composition. And research concerning the temperature factor is often centered on fixed low temperatures, high temperatures, or established temperature histories, with relatively few studies delving into the impact of temperature cycles [17,18]. In reality, the actual engineering environments subjected to the continuous cyclical changes instead of fixed, due to factors like seasons and sunlight exposure.…”

Section: Introductionmentioning

confidence: 99%

Reliability Analysis of Compressive Fatigue Life of Cement Concrete under Temperature Differential Cycling

Tao,

Dong,

et al. 2024

Advances in Civil Engineering

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Cement concrete, as an extensively used engineering material, is omnipresent in various infrastructure projects such as bridges and roads. However, these structures often need to operate for extended periods under varying and harsh environmental conditions, facing not only complex vehicular loads but also the effects of temperature differential cycling. Consequently, understanding how temperature differential cycling impacts the compressive fatigue life of cement concrete has become a pivotal research topic. In this study, through a comprehensive experimental design, the fatigue life of cement concrete under typical temperature difference conditions (20–60°C) and different number of temperature differential cycling (60, 120, 180, 240, 300) was tested at three stress levels (0.70, 0.75, 0.85). Statistical analysis was conducted to obtain the Weibull distribution parameters of the compressive fatigue life of cement concrete. The Pf–S–N relationship of concrete considering reliability was analyzed, and a fatigue life prediction model under different reliability probabilities was established. The results show that the fatigue life of concrete subjected to temperature differential cycling follows a two-parameter Weibull distribution well. From the Pf–N curve, it can be seen that, regardless of the stress level, the calculated fatigue life under the same reliability probability decreases with the increase of temperature differential cycling times. At a 95% reliability probability, the decrease can reach 77.5%–87.5%. Based on the exponential function, a concrete fatigue life prediction model based on different reliability levels was established. Using this model, the S–lgN curve was plotted, and it was found that, regardless of the temperature differential cycling, an increase in reliability probability could lead to a 7.3%–14.4% reduction in logarithmic fatigue life (lgN). Additionally, this study also defined a fatigue life safety factor related to the number of temperature differential cycling and reliability probability, aiming to provide a theoretical basis for the design of cement concrete materials under the coupled environment of temperature differential cycling and fatigue loading.

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Section: Introductionmentioning

confidence: 99%