Dynamic damping ratio of mudded intercalations with small and medium strain during cyclic dynamic loading

2021 ◽  
Vol 280 ◽  
pp. 105952
Author(s):  
Yaguang Qin ◽  
Xiao Xu ◽  
Changbin Yan ◽  
Lei Wen ◽  
Zhuo Wang ◽  
...  
Keyword(s):  
Dynamic Loading ◽  
Damping Ratio ◽  
Dynamic Damping ◽  
Cyclic Dynamic

scholarly journals A Study of Mechanical Property of Artificial Frozen Clay under Dynamic Load

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Dongwei Li ◽  
Juhong Fan
Keyword(s):  
Dynamic Load ◽  
Damping Ratio ◽  
Frozen Soil ◽  
Practical Significance ◽  
Future Research ◽  
Dynamic Shear Modulus ◽  
Shear Tests ◽  
Dynamic Damping ◽  
Different Temperatures ◽  
Frozen Clay

To determine the mechanical properties of artificial frozen clay under dynamic load, 81 triaxial shear tests were carried out for artificial frozen clay at different temperatures, amplitudes, frequencies, and precompressions and three kinds of testing conditions. The change laws of the dynamic modulus of elasticity, maximum dynamic shear modulus, dynamic damping ratio, and strain rate were determined. These results can guide future research on the mechanical mechanisms of frozen soil, providing both theoretical and practical significance.

Research on Relationship of Dynamic Calculation Parameters and Deformation

2012 ◽  
Vol 178-181 ◽  
pp. 1459-1462
Author(s):  
Jian Yi Yuan ◽  
Tao Cheng ◽  
Ding Bang Zhang ◽  
Zhen Hua Wu ◽  
Jian Xiang
Keyword(s):  
Shear Modulus ◽  
Elastic Deformation ◽  
High Speed ◽  
Damping Ratio ◽  
Bottom Layer ◽  
Dynamic Shear Modulus ◽  
Dynamic Shear ◽  
Dynamic Calculation ◽  
Nonlinear Fitting ◽  
Dynamic Damping

In order to analyze the effect of dynamic calculation parameters to subgrade deformation, cross-section in the Shanghai-Nanjing high-speed railway is chosen and the numerical simulation calculation method is applied. Through numerical calculation of 121 kinds of conditions combining dynamic shear modulus and dynamic damping ratio, the dynamic elastic deformation of point A and dynamic partial stress of bottom layer of foundation bed were studied. It shows that the maximum dynamic elastic deformation of point A reduces with dynamic shear modulus and dynamic damping ratio increasing. Moreover, the value of average dynamic partial stress augments with dynamic shear modulus increasing, and reduces along with the increase of dynamic damping ratio. Using nonlinear fitting method of constructing three polynomial surface equations, the function of total deformation with dynamic calculation parameters is obtained.

scholarly journals FULL-SCALE CYCLIC DYNAMIC LOADING EXPERIMENTS OF THE GROUND REINFORCED BY GEOCELL AND GEOTEXTILE

2009 ◽  
Vol 24 ◽  
pp. 201-204
Author(s):  
Yuta SATOH ◽  
Taichi TACHIBANA ◽  
Kumiko SUZUKI ◽  
Kenji KANEKO ◽  
Akinori HAZAMA ◽  
...  
Keyword(s):  
Dynamic Loading ◽  
Full Scale ◽  
Cyclic Dynamic

scholarly journals Analysis of damping ratio on the optimization of geometrically nonlinear truss structures subjected to dynamic loading

2020 ◽  
Vol 19 (3) ◽  
pp. 321-334
Author(s):  
Élcio Cassimiro Alves ◽  
◽  
Larissa Bastos Martinelli ◽  
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Loading ◽  
Geometric Nonlinearity ◽  
Numerical Models ◽  
Damping Ratio ◽  
Nonlinear Dynamic Analysis ◽  
Truss Structures ◽  
Geometrically Nonlinear ◽  
Cross Sectional ◽  
Updated Lagrangian

The objective of this paper is to present the formulation for optimizing truss structures with geometric nonlinearity under dynamic loads, provide pertinent case studies and investigate the influence of damping on the final result. The type of optimization studied herein aims to determine the cross-sectional areas that will minimize the weight of a given structural system, by imposing constraints on nodal displacements and axial stresses. The analyses are carried out using Sequential Quadratic Programming (SQP), available in MATLAB’s Optimization Toolbox™. The nonlinear finite space truss element is defined with an updated Lagrangian formulation, and the geometrically nonlinear dynamic analysis performed herein combines the Newmark method with Newton-Raphson iterations. The dynamic analysis approach was validated by comparing the results obtained with solutions available in the literature as well as with numerical models developed with ANSYS® 18.2. A number of optimization examples of planar and space trusses under dynamic loading with geometric nonlinearity are presented. Results indicate that the consideration of damping effects may lead to a significant reduction in structural weight and that such weight reduction is proportional to increases in damping ratio.

scholarly journals Dynamic Characteristics of Lightweight Aggregate Self-Compacting Concrete by Impact Resonance Method

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Ning Li ◽  
Sisi Zhang ◽  
Guangcheng Long ◽  
Zuquan Jin ◽  
Yong Yu ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Shear Modulus ◽  
Dynamic Loading ◽  
Damping Ratio ◽  
Resonance Method ◽  
Lightweight Aggregate ◽  
Damping Capacity ◽  
Self Compacting Concrete ◽  
Impact Resonance ◽  
Dynamic Loading Conditions

Understanding the dynamic behavior of Lightweight Aggregate Self-Compacting Concrete (LWASCC) is of importance to the safety of concrete structures serving in dynamic loading conditions. In this study, the fundamental dynamic properties of LWASCC with three types of LWA were investigated by the impact resonance method. Results show that the dynamic elastic and shear modulus generally decrease with the increase of LWA volume fraction, whereas three types of LWA exert limited influence on dynamic Poisson’s ratio. The dynamic elastic and shear modulus show good linear dependence upon compressive strength. The inclusion of three types of LWA significantly increases the damping ratio, indicating significantly enhanced damping capacity of LWASCC under dynamic loading conditions. The damping ratio of LWASCC is improved by 2.0%, 4.4%, and 2.9% when adding 1% (by volume) expanded clay, rubber, and expanded polystyrene, respectively. The compressive strength and dynamic performances of LWASCC are highly influenced by the intrinsic properties (elastic modulus, damping capacity, wettability, etc.) and geometrical characteristics (size, surface roughness, etc.) of LWA, as well as the LWA-matrix bonding capacity.

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