scholarly journals SHEAR FORCE AND HORIZONTAL RELATIVE DISPLACEMENT RELATIONSHIP OF L-SHAPE SHEAR CONNECTOR SUBJECTED TO STRUT COMPRESSIVE FORCE IN STEEL-CONCRETE COMPOSITE STRUCTURE

2010 ◽  
Vol 27 (2) ◽  
pp. 56s-71s
Author(s):  
Soty ROS ◽  
Hiroshi SHIMA
Keyword(s):  
Composite Structure ◽  
Shear Force ◽  
Compressive Force ◽  
Relative Displacement ◽  
Shear Connector ◽  
Relationship Of

Roller–rail parameters on the transverse vibration characteristics of super-high-speed elevators

2019 ◽  
Vol 43 (4) ◽  
pp. 535-543 ◽  
Author(s):  
Shunxin Cao ◽  
Ruijun Zhang ◽  
Shuohua Zhang ◽  
Shuai Qiao ◽  
Dongsheng Cong ◽  
...  
Keyword(s):  
High Speed ◽  
Relative Displacement ◽  
Guide Rail ◽  
Coupled Vibration ◽  
Vibration Acceleration ◽  
Vibration Model ◽  
Vibration Problems ◽  
Equivalent Method ◽  
Relationship Of ◽  
The Relationship

Interaction and wear between wheel and rail become increasingly serious with the increase in elevator speed and load. Uneven roller surface, eccentricity of rollers, and the looseness of rail brackets result in serious vibration problems of high-speed and super-high-speed elevators. Therefore, the forced vibration differential equation representing elevator guide rails is established based on Bernoulli–Euler theory, and the vibration equation of the elevator guide shoes and the car is constructed using the Darren Bell principle. Then, the coupled vibration model of guide rail, guide shoes, and car can be obtained using the relationship of force and relative displacement among these components. The roller–rail parameters are introduced into the established coupled vibration model using the model equivalent method. Then, the influence of roller–rail parameters on the horizontal vibration of super-high-speed elevator cars is investigated. Roller eccentricity and the vibration acceleration of the car present a linear correlation, with the amplitude of the car vibration acceleration increasing with the eccentricity of the roller. A nonlinear relationship exists between the surface roughness of the roller and the vibration acceleration of the car. Increased continuous loosening of the guide rail results in severe vibration of the car at the loose position of the support.

Fatigue damage of PBH shear connector of steel-concrete composite structure

2020 ◽  
Vol 213 ◽  
pp. 110540
Author(s):  
Long B. Yan ◽  
Bing Han ◽  
Liang Fan ◽  
Xiao Li
Keyword(s):  
Fatigue Damage ◽  
Composite Structure ◽  
Shear Connector

Method of Calculating Chamber Earth Pressure of EPB Shield

2014 ◽  
Vol 886 ◽  
pp. 426-431 ◽  
Author(s):  
Bo Liang ◽  
Jing Cao ◽  
Hai Xing Yang ◽  
Zu De Ding ◽  
Hui Ming Zhao
Keyword(s):  
Limit Equilibrium ◽  
Earth Pressure ◽  
Relative Displacement ◽  
Shield Tunnel ◽  
Limit States ◽  
Relationship Of ◽  
The Relationship ◽  
Epb Shield ◽  
Selection Of ◽  
Construction Practice

In order to calculate earth pressure in working chamber, three calculation modes which corresponding to status of elastic balanced, active limit equilibrium and passive limit equilibrium of the soil on the excavation face was built. The relationship of relative displacement between the soil in the chamber and the soil on the excavation face of shallow EPB shield tunnel was analyzed based on Rankines earth pressure theory. The threshold of chamber earth pressure values which correspond to the limit states of subsidence and upheaval were deduced and the reasonable range of the values were obtained. Combined with a shield tunnel construction practice, the theoretical and measured values are compared. The results show that the theoretical equations are valid and can provide a theoretical approach for the selection of chamber earth pressure.

scholarly journals Supporting Forces and Stability of Snow-Slab Avalanches: A Parameter Study

1989 ◽  
Vol 13 ◽  
pp. 140-145 ◽  
Author(s):  
Bernhard Lackinger
Keyword(s):  
Shear Force ◽  
Shear Failure ◽  
Tensile Force ◽  
Normal Component ◽  
Compressive Force ◽  
Stability Index ◽  
Parameter Study ◽  
Shear Surface ◽  
The Stability ◽  
Low Shear

The fracture of a slab avalanche is a multi-phase and progressive process. The different kinds of fracture and possible scenarios of avalanche release in the form of a zip effect are shown. In the course of investigations, most importance has so far been attached to shear failure along the sliding surface. Various cases of load and their effects on the stresses, on the changes of strength, and on the stability of the inclined snow-pack are discussed. The usual simple model of the shear-stability index is unsatisfactory. The present paper deals with the complex interaction of all supporting forces of a snow slab by means of simplified geotechnical considerations. For this purpose, the acting and reacting forces of a “standard avalanche” (i.e. dead load with driving and normal component, shear force, tensile force, compressive force, and flank force) are estimated from published boundary values. Using different combinations (e.g. hard slab with high circumferential forces on a weak shear surface with low shear force), it can be shown that suspension at the crown and lower and lateral support are of great importance. This applies especially to cases with low shear forces and, consequently, with low overall stability. Despite the fact that the circumferential area of the model avalanche is only 6% of the area of the shear surface, the circumferential force in this case is more than 150% of the shear force. In a parameter study with different avalanche sizes, these results are generalized and confirmed. For the assumed strength limits, critical areas and depths of possible slab avalanches can be derived. Although the supporting shear force is the major contributor to stability, particularly with larger slabs, it can be seen from the investigations that the redistributions of stress and spatial supports and suspensions of the whole slab avalanche must not be neglected in stability analyses.

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