Load-carrying mechanism of truss-confined buckling-restrained braces: Numerical and theoretical analyses

2020 ◽  
Vol 212 ◽  
pp. 110500
Author(s):  
Meng-Zheng Wang ◽  
Yan-Lin Guo ◽  
Peng Zhou
Keyword(s):  
Load Carrying ◽  
Buckling Restrained Braces ◽  
Confined Buckling ◽  
Theoretical Analyses

Numerical studies of cyclic behavior and design suggestions on triple-truss-confined buckling-restrained braces

2017 ◽  
Vol 146 ◽  
pp. 1-17 ◽  
Author(s):  
Yan-Lin Guo ◽  
Peng Zhou ◽  
Meng-Zheng Wang ◽  
Yong-Lin Pi ◽  
Mark Andrew Bradford
Keyword(s):  
Cyclic Behavior ◽  
Numerical Studies ◽  
Buckling Restrained Braces ◽  
Confined Buckling

An Investigation into the Permissible Load-Carrying Capacity of Steel Wire Ropes for Hoisting with Special Reference to Deep-Level Winding on the Witwatersrand Goldfields

1939 ◽  
Vol 142 (1) ◽  
pp. 225-260
Author(s):  
J. J. P. Dolan ◽  
W. G. Jackson
Keyword(s):  
Factor Of Safety ◽  
Deep Level ◽  
Steel Wire ◽  
Load Carrying Capacity ◽  
Operating Life ◽  
Wire Ropes ◽  
Load Carrying ◽  
The Government ◽  
Theoretical Analyses ◽  
Accident Statistics

The aim of the paper is to determine the stresses to which a wire rope is subjected during winding operations, to assess its condition during its operating life, and to correlate its life history with the autographic load-extension diagrams, taken under the statutory periodic tests at the Government Mechanical Laboratory.‡ Theoretical analyses of rope stresses due to different causes are examined in the light of records obtained by decelerometers and cinematographic cameras, and data relating to six hundred ropes, each not less than 1¼ inches in diameter, are analysed statistically. Published reports of British, American, and German investigations are compared and utilized, and the relations of the factor of safety to accident statistics and to the characteristics of the rope are examined. The decrease of the factor of safety with the increase in depth is studied, and the paper concludes by advocating the legalization of a lower factor of safety for deep-level winding, and recommends that this can be best effected by the adoption of the capacity factor method, first proposed by Vaughan.

Experimental and numerical studies of hysteretic response of triple-truss-confined buckling-restrained braces

2017 ◽  
Vol 148 ◽  
pp. 157-174 ◽  
Author(s):  
Yan-Lin Guo ◽  
Peng Zhou ◽  
Meng-Zheng Wang ◽  
Yong-Lin Pi ◽  
Mark Andrew Bradford ◽  
...  
Keyword(s):  
Numerical Studies ◽  
Buckling Restrained Braces ◽  
Confined Buckling ◽  
Hysteretic Response

Applying load-sharing method to the sliding contact in the presence of nano-lubricants

2020 ◽  
pp. 135065012092755
Author(s):  
R Gholami ◽  
Saleh Akbarzadeh ◽  
S Ziaei-Rad ◽  
MM Khonsari
Keyword(s):  
Friction Coefficient ◽  
Experimental Testing ◽  
Weight Fraction ◽  
Nano Particles ◽  
Engine Oil ◽  
Load Carrying ◽  
Mixed Lubrication Regime ◽  
Pin On Disk ◽  
Theoretical Analyses ◽  
Good Agreement

The main goal of this study is to present a model to investigate the effect of nano-particles’ weight fraction on the friction coefficient of rough contact in the mixed-lubrication regime. Experimental testing involves pin-on-disk measurements of the friction coefficient with CuO nano-particles added to engine oil. Theoretical analyses involve developing a method for treating an EHL line contact with provision for surface roughness that takes into account the load-carrying capacity of surface asperities, lubricant, and nano-particles. Results show that theoretical and experimental results for friction coefficients are in good agreement. A parametric study is conducted to investigate effect of load, the geometry of the nano-particles, and their mechanical properties as well as their weight fraction on the friction coefficient.

Resolution in the scanning tunneling microscope

1991 ◽  
Vol 49 ◽  
pp. 488-489
Author(s):  
R. J. Wilson ◽  
D. D. Chambliss ◽  
S. Chiang ◽  
V. M. Hallmark
Keyword(s):  
Scanning Tunneling Microscope ◽  
Fundamental Principle ◽  
Atomic Scale ◽  
Lateral Resolution ◽  
Scanning Tunneling ◽  
Electronic Noise ◽  
Vertical Resolution ◽  
Tunneling Microscopy ◽  
Spatial Profile ◽  
Theoretical Analyses

Scanning tunneling microscopy (STM) has been used for many atomic scale observations of metal and semiconductor surfaces. The fundamental principle of the microscope involves the tunneling of evanescent electrons through a 10Å gap between a sharp tip and a reasonably conductive sample at energies in the eV range. Lateral and vertical resolution are used to define the minimum detectable width and height of observed features. Theoretical analyses first discussed lateral resolution in idealized cases, and recent work includes more general considerations. In all cases it is concluded that lateral resolution in STM depends upon the spatial profile of electronic states of both the sample and tip at energies near the Fermi level. Vertical resolution is typically limited by mechanical and electronic noise.

Low-Cost Load-Carrying Devices

1995 ◽  
Author(s):  
Ron Dennis ◽  
Alan Smith
Keyword(s):  
Low Cost ◽  
Load Carrying

Performance study of RTV-2 Silicone Rubber Material For Soft Actuator by Experimental and Numerical methods: The Effect of Inflation Pressure and Wall Thickness

2020 ◽  
Vol 17 (1) ◽  
pp. 7524-7532 ◽  
Author(s):  
Deepak D. ◽  
Nitesh Kumar ◽  
Shreyas P. Shetty ◽  
Saurabh Jain ◽  
Manoj Bhat
Keyword(s):  
Numerical Methods ◽  
Wall Thickness ◽  
Silicone Rubber ◽  
Inflation Pressure ◽  
Performance Study ◽  
Rubber Material ◽  
Soft Actuator ◽  
Alternative Materials ◽  
Load Carrying ◽  
Influential Parameters

The expensive nature of currently used materials in the soft robotic industry demands the consideration of alternative materials for fabrication. This work investigates the performance of RTV-2 grade silicone rubber for fabrication of a soft actuator. Initially, a cylindrical actuator is fabricated using this material and its performance is experimentally assessed for different pressures. Further, parametric variations of the effect of wall thickness and inflation pressure are studied by numerical methods. Results show that, both wall thickness and inflation pressure are influential parameters which affect the elongation behaviour of the actuator. Thin (1.5 mm) sectioned actuators produced 76.97% more elongation compared to thick sectioned, but the stress induced is 89.61 % higher. Whereas, the thick sectioned actuator (6 mm) showed a higher load transmitting capability. With change in wall thickness from 1.5 mm to 6 mm, the elongation is reduced by 76.97 %, 38.35 %, 21.05 % and 11.43 % at pressure 100 kPa, 75 kPa, 50 kPa and 25 kPa respectively. The induced stress is also found reduced by 89.61 %, 86.66 %, 84.46 % and 68.68 % at these pressures. The average load carrying capacity of the actuator is found to be directly proportional to its wall thickness and inflation pressure.

Influence of Yield Strength Variability over Cross-Section to Steel Beam Load-Carrying Capacity

2005 ◽  
Vol 10 (2) ◽  
pp. 151-160 ◽  
Author(s):  
J. Kala ◽  
Z. Kala
Keyword(s):  
Yield Strength ◽  
Cross Section ◽  
Carrying Capacity ◽  
Bending Moment ◽  
Statistical Characteristics ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Strength Variability ◽  
Hot Rolled ◽  
Hot Rolled Steel

Authors of article analysed influence of variability of yield strength over cross-section of hot rolled steel member to its load-carrying capacity. In calculation models, the yield strength is usually taken as constant. But yield strength of a steel hot-rolled beam is generally a random quantity. Not only the whole beam but also its parts have slightly different material characteristics. According to the results of more accurate measurements, the statistical characteristics of the material taken from various cross-section points (e.g. from a web and a flange) are, however, more or less different. This variation is described by one dimensional random field. The load-carrying capacity of the beam IPE300 under bending moment at its ends with the lateral buckling influence included is analysed, nondimensional slenderness according to EC3 is λ¯ = 0.6. For this relatively low slender beam the influence of the yield strength on the load-carrying capacity is large. Also the influence of all the other imperfections as accurately as possible, the load-carrying capacity was determined by geometrically and materially nonlinear solution of very accurate FEM model by the ANSYS programme.

Fuzzy Sets Theory in Comparison with Stochastic Methods to Analyse Nonlinear Behaviour of a Steel Member under Compression

2005 ◽  
Vol 10 (1) ◽  
pp. 65-75 ◽  
Author(s):  
Z. Kala
Keyword(s):  
Fuzzy Sets ◽  
Carrying Capacity ◽  
Stochastic Methods ◽  
Nonlinear Behaviour ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Input Parameters ◽  
Stochastic Solution ◽  
Fuzzy Solution ◽  
Sets Theory

The load-carrying capacity of the member with imperfections under axial compression is analysed in the present paper. The study is divided into two parts: (i) in the first one, the input parameters are considered to be random numbers (with distribution of probability functions obtained from experimental results and/or tolerance standard), while (ii) in the other one, the input parameters are considered to be fuzzy numbers (with membership functions). The load-carrying capacity was calculated by geometrical nonlinear solution of a beam by means of the finite element method. In the case (ii), the membership function was determined by applying the fuzzy sets, whereas in the case (i), the distribution probability function of load-carrying capacity was determined. For (i) stochastic solution, the numerical simulation Monte Carlo method was applied, whereas for (ii) fuzzy solution, the method of the so-called α cuts was applied. The design load-carrying capacity was determined according to the EC3 and EN1990 standards. The results of the fuzzy, stochastic and deterministic analyses are compared in the concluding part of the paper.

Visual and Theoretical Analyses of the Early Stage of Frost Formation on Cold Surfaces

2007 ◽  
Vol 14 (3) ◽  
pp. 257-268 ◽  
Author(s):  
Xiaomin Wu ◽  
WanTian Dai ◽  
XiaoFeng Shan ◽  
Weicheng Wang ◽  
LiMing Tang
Keyword(s):  
Early Stage ◽  
Frost Formation ◽  
Theoretical Analyses
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