Dynamic response of bridges under moving vehicles with uncertainty in system parameters

2010 ◽  
pp. 293-296
Author(s):  
N Liu ◽  
W Gao ◽  
N Zhang
Keyword(s):  
Dynamic Response ◽  
System Parameters ◽  
Moving Vehicles

Dynamic Response of the Steel Bridge Deck Thin Surfacing due to Vehicle Load

2010 ◽  
Vol 148-149 ◽  
pp. 544-547
Author(s):  
Xun Qian Xu ◽  
Ye Yuan Ma ◽  
Guo Qing Wu ◽  
Xiu Mei Gao
Keyword(s):  
Dynamic Response ◽  
Bridge Deck ◽  
Three Dimensional ◽  
Coupled Model ◽  
Interface Layer ◽  
Dynamic Responses ◽  
Steel Bridge ◽  
Vehicle Load ◽  
Moving Vehicles ◽  
Space Technique

Basing on the coupled vibration theory, dynamic behavior of steel bridge deck thin surfacing under rand moving vehicles is studied. A three-dimensional coupled model is carried out for the steel bridges deck thin surfacing and vehicle. A method based on modal superposition and state space technique is developed to solve dynamic response generated by vehicle-surfacing interaction. The dynamic responses of an actual steel bridge deck thin surfacing are studied. The results show that adding epoxy asphalt as a sub coat can improve interface adhesion strength, which would be designed as the interface layer of steel deck thin surfacing.

Analysis and Synthesis of Mechanical Error in Cam-Follower Systems

1982 ◽  
Vol 104 (1) ◽  
pp. 52-62 ◽  
Author(s):  
S. S. Rao ◽  
S. S. Gavane
Keyword(s):  
Nonlinear Programming ◽  
Dynamic Response ◽  
Confidence Level ◽  
Manufacturing Cost ◽  
System Parameters ◽  
Analysis And Synthesis ◽  
Cam Follower ◽  
Programming Techniques ◽  
Allowable Error ◽  
Synthesis Procedure

A method of evaluating the mechanical error in the kinematic and dynamic response of cam-follower systems is presented based on probability principles. The error is analyzed for the three-sigma band of confidence level. A synthesis procedure, using nonlinear programming techniques, of distributing tolerances on geometrical and other system parameters is discussed. The objective of the synthesis problem is to minimize a measure of the manufacturing cost for specified maximum allowable error in the kinematic or dynamic response of the cam-follower system. The application of analysis and synthesis procedures is demonstrated with reference to a disc cam with translating roller follower.

Dynamic Characteristics of a Hydraulic Damper

2002 ◽  
Author(s):  
Vishnu Verma ◽  
A. K. Ghosh ◽  
H. S. Kushwaha
Keyword(s):  
Pressure Drop ◽  
Dynamic Response ◽  
Analytical Model ◽  
Dynamic Characteristics ◽  
System Parameters ◽  
Hydraulic Damper ◽  
Dynamic Excitation ◽  
Sinusoidal Motion ◽  
Bypass Line

The response of a structure to earthquake or any other dynamic excitation can be brought down by using a suitable damper such as a hydraulic damper. An analytical model has been developed for hydraulic damper, which consists of a cylinder and piston arrangement with a bypass pipeline. The stiffness of the system is primarily due to the compressibility of the fluid and the damping is largely due to the pressure drop in the bypass line. The dynamic response of the hydraulic damper has been evaluated for an assumed sinusoidal motion of the piston. The paper presents detailed results of the study of the dynamic response of the damper to variations in input and system parameters. The characteristics of the damper, thus obtained, will be useful in determining the dynamic response of the whole system to which this damper will be attached.

Influence of an adjacent structure on the horizontal and torsional input motion of an embedded foundation

2016 ◽  
Vol 20 (3) ◽  
pp. 411-425 ◽  
Author(s):  
Xuezhang Wen ◽  
Fangyuan Zhou ◽  
Hongping Zhu
Keyword(s):  
Dynamic Response ◽  
Natural Frequency ◽  
System Parameters ◽  
Structure Response ◽  
Embedded Foundation ◽  
Adjacent Structure ◽  
Input Motion ◽  
Existing Structure ◽  
Important System

Influence of an adjacent structure on both the horizontal and torsional input motion of an embedded foundation is discussed in this article. Four important system parameters, namely, the distance between the adjacent structure and embedded foundation, the natural frequency of the adjacent structure, the shape of the adjacent structure, and the arrangement angle of the adjacent structure are considered to investigate both the horizontal and torsional input motion of an embedded foundation influenced by an adjacent structure. It is found that the values of the horizontal input motion of the embedded foundation can be significantly influenced around the natural frequency of the adjacent structure. The torsional input motion of the embedded foundation can be generated due to the presence of the adjacent structure. Response of an existing structure influenced by the adjacent structure is then investigated. The results show that the response of the existing structure can be affected by the adjacent structure. When the horizontal natural frequency of the adjacent structure coincides with the torsional natural frequency of the existing structure, the torsional dynamic response of the existing structure can be affected significantly.

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