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Strength reduction and step-loading finite element approaches in geotechnical engineering

Journal of Rock Mechanics and Geotechnical Engineering 2009年第1期1卷 21-30页

作者： Yingren Zheng Xiaosong Tang Shangyi Zhao Chujian Deng Wenjie Lei Department of Ctvd Engmeering Logistwal Engineering University Chongqing 400041 China Chongqing Engmeermg and Technology Research Center of Geological Hazard Prevention and Treatment Chongqing 400041 China Sehoo of Safety Science and Engineering Henan Polytechnic University Jiaozuo 454000 China

The finite element limit analysis method has the advantages of both numerical and traditional limit equilibrium techniques and it is particularly useful to geotechnical *** method has been developed in China,following well-accepted international procedures,to enhance understanding of stability issues in a number of geotechnical *** advancements have been made in basic theory,the improvement of computational precision,and the broadening of practical *** paper presents the results of research on（1） the efficient design of embedded anti-slide piles,（2） the stability analysis of reservoir slopes with strength reduction theory,and（3） the determination of the ultimate bearing capacity of foundations using step-loading FEM（overloading）.These three applications are evidence of the design improvements and benefits made possible in geotechnical engineering by finite element modeling.

关键词： finite element limit analysis method strength reduction step-loading embedded anti-slide piles reservoir slope foundation

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Ratcheting behavior of notched stainless steel samples subjected to asymmetric loading cycles

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Journal of Iron and Steel Research International 2021年第1期28卷 86-97页

作者： A.Shekarian A.Varvani‑Farahani Department of Mechanical and Industrial Engineering Ryerson UniversityToronto M5B 2K3ONCanada

The ratcheting response of 316 stainless steel samples at the vicinity of notch roots under single-and multi-step loading conditions is ***-step tests were conducted to examine local ratcheting at different low–high–high and high–low–low loading *** stress levels over loading steps and their sequences highly influenced ratcheting magnitude and *** change of stress level from low to high promoted ratcheting over proceeding cycles while ratcheting strains dropped in magnitude for opposing sequence where stress level dropped from high to *** ratcheting strain values at the vicinity of notch root were found noticeably larger than nominal ratcheting values measured at farer distances from notch edge through use of strain *** values in both mediums of local and nominal were promoted as notch diameter *** assess progressive ratcheting response and stress relaxation concurrently,the Ahmadzadeh-Varvani(A-V)kinematic hardening rule was coupled with Neuber’s rule enabling to calculate local stress at notch root of steel *** stress/strain values were progressed at notch root over applied asymmetric stress cycles resulting in ratcheting buildup through A-V *** relaxation of stress values at a given peak-valley strain event was governed through the Neuber’s *** ratcheting data were found agreeable with those predicted through the coupled framework.

关键词： Ratcheting strain Notch root step-loading loading sequence Kinematic hardening rule Neuber’s rule

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