Effect of High-cyclic Loads on Dynamic Response of Reinforced Concrete Slabs

Jamadin, Adiza; Ibrahim, Zainah; Jumaat, Mohd Zamin; Wahab, Ezahtul Shahreen Ab

doi:10.1007/s12205-019-0889-1

Cited by 12 publications

(5 citation statements)

References 15 publications

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“…The comparative experiments conducted in this study draw inspiration from recent research by Jamadin [15,16]. As depicted in Figure 1, Jamadin [15,16] explored the fatigue behavior of reinforced concrete (RC) slabs subjected to 1, 1.5, and 2 million cycles of high cyclic loading, along with the corresponding variations in dynamic characteristics, structural stiffness, and residual load-carrying capacity. The tested RC slabs had dimensions of 2200 mm (length) × 1000 mm (width) × 150 mm (thickness).…”

Section: Experimental Overviewmentioning

confidence: 99%

“…Researchers such as Hsu [10], Sima [11], Aslani [12], Guo [13], and Zou [2] consider the monotonic stress-strain curve of concrete under static loading as the envelope curve for the stress-strain curve under axial cyclic loading, putting forth formulas for residual concrete strength [2,13]. Barsom's research [14] demonstrates that the elastic modulus of steel remains constant under fatigue loads, while Feng [15] measures steel damage by the reduction in the effective cross-sectional area after fatigue. Jamadin [16] uses comprehensive dynamic response techniques to assess the stiffness degradation characteristics of reinforced concrete slabs with increasing fatigue loads.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear FE Analysis and Life Prediction of RC Slabs under High-Cyclic Loading

Zou,

Ibrahim,

Hashim

2024

World Congress on Civil, Structural, and Environmental Engineering

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Engineering structures, such as bridges, highways, airport pavements, and offshore platforms, are constantly exposed to varying degrees of fatigue loading. The accumulation of fatigue loads can result in structural damage well before reaching their ultimate load capacity. Consequently, a comprehensive assessment of fatigue performance and service life prediction for these structures is paramount. This study focuses on a parametric investigation of the fatigue performance of reinforced concrete slabs under high cyclic fatigue loading, employing the nonlinear finite element method. The research scrutinizes the influences of load levels, concrete grades, and reinforcement ratios on several key parameters, including structural deflection, reinforcement stresses, cumulative damage, and natural frequency degradation. This study develops the three-dimensional finite element models based on experimental data, with rigorous verification of the model's accuracy. The findings emphasize the considerable impact of load levels, concrete grades, and reinforcement ratios on deflection, reinforcement stress, and cumulative damage in fatigued reinforced concrete slabs. Notably, the main form of structural fatigue damage is fatigue fracture of steel reinforcement, but high load levels, low concrete strength and reinforcement rates can cause concrete fatigue damage. Increasing concrete strength and reinforcement ratio can increase the initial natural frequency of the structure and slow down the fatigue degradation at the natural frequency. Additionally, the study proposes a practical life prediction equation for engineering designers. This equation offers valuable tools for predicting the fatigue life of reinforced concrete slabs, aiding in the design and maintenance of durable engineering structures.

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Section: Experimental Overviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear FE Analysis and Life Prediction of RC Slabs under High-Cyclic Loading

Zou,

Ibrahim,

Hashim

2024

World Congress on Civil, Structural, and Environmental Engineering

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“…It can be concluded that the fatigue research presented in this section is focused on the fatigue performance of concrete material level. Also, several types of research have been carried out on the fatigue of the concrete beams [47][48][49][50][51][52][53][54][55] and slabs [56,57]. Structural fatigue is affected by many factors, such as reinforcement ratio, shear span ratio, concrete strength, and so on.…”

Section: Empirical Fatigue Failure Criteriamentioning

confidence: 99%

Analytical Models of Concrete Fatigue: A State-of-the-Art Review

Wei¹,

Makhloof²,

Ren³

2023

Computer Modeling in Engineering &Amp; Sciences

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Fatigue failure phenomena of the concrete structures under long-term low amplitude loading have attracted more attention. Some structures, such as wind power towers, offshore platforms, and high-speed railways, may resist millions of cycles loading during their intended lives. Over the past century, analytical methods for concrete fatigue are emerging. It is concluded that models for the concrete fatigue calculation can fall into four categories: the empirical model relying on fatigue tests, fatigue crack growth model in fracture mechanics, fatigue damage evolution model based on damage mechanics and advanced machine learning model. In this paper, a detailed review of fatigue computing methodology for concrete is presented, and the characteristics of different types of fatigue models have been stated and discussed.

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“…Since the mined-out area may be located at different positions under the railway train, the depth of disturbance at different positions under the railway train is required. When a static load is added to the surface directly above the mined-out area, the relationship between the load and the stability of the mined-out area is derived, and the additional effect of the added load on the stability of the mined-out area is obtained [17].…”

Section: Formula Used In Foundation Activationmentioning

confidence: 99%

Foundation Activation Deformation and Environmental Restoration of Goaf under Cyclic Dynamic Load of High-speed Railway

2023

IJETC

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With the rapid development of China's economic development, more and more transportation infrastructure construction, the construction of railways and highways in many places will inevitably pass through the goaf, and the foundation of the goaf cannot be avoided, or an avoidance plan is adopted The problem of roof stability in the mined-out area has become increasingly prominent as an unfavorable geological problem in railway construction when the land is occupied and the cost is relatively high. This study explored the foundation activation deformation and environmental restoration treatment of the mined-out area under the action of high-speed railway cyclic dynamic loads. This study divides the load values into 10N, 20N, 30N, 40N, 50N, and 60N. When the load is 50N, the maximum rate of soil settlement on the top of the cap is 90%. When the load is 60N, the soil settlement between the piles under the cap is 85%. Because the parameter reduction is the range ratio reduction, the reduction ratio needs to be determined according to the actual deformation of the project. The surface subsidence in the study area is 0.7m, and the reduction ratio when the surface subsidence is 0.7m is determined by three-dimensional numerical simulation. Control the characteristics of the soil surface humidity before the start of the experiment, and avoid the selected goaf zone because the surface humidity is inconsistent, which ultimately leads to a large difference in the experimental results. The experimental results show that with the increase of the load, the soil settlement between the top of the cap and the pile below the cap is gradually increasing: although the settlement is slightly different everywhere, the difference is very small. It can be seen that the platform is a rigid platform, under the load, the overall force, overall settlement, as the embankment load increases, the settlement curve changes from steep to slow, and eventually tends to grow steadily.

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Effect of High-cyclic Loads on Dynamic Response of Reinforced Concrete Slabs

Cited by 12 publications

References 15 publications

Nonlinear FE Analysis and Life Prediction of RC Slabs under High-Cyclic Loading

Nonlinear FE Analysis and Life Prediction of RC Slabs under High-Cyclic Loading

Analytical Models of Concrete Fatigue: A State-of-the-Art Review

Foundation Activation Deformation and Environmental Restoration of Goaf under Cyclic Dynamic Load of High-speed Railway

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