Dynamic response of underreamed batter piles subjected to vertical vibration

2022 ◽  
pp. 1-9
Author(s):  
M. Bharathi ◽  
R.N. Dubey ◽  
Sanjay K. Shukla
Keyword(s):  
Dynamic Response ◽  
Vertical Vibration ◽  
Batter Piles

Influence Analysis of Cell Plate Length to Slab Track Vertical Dynamic Response

2014 ◽  
Vol 505-506 ◽  
pp. 58-63
Author(s):  
Xiao Chuan Ma ◽  
Wei Luo ◽  
Ping Wang ◽  
Bao Ru Guo
Keyword(s):  
Dynamic Response ◽  
Base Plate ◽  
Shell Element ◽  
Cell Plate ◽  
Vertical Vibration ◽  
Vibration Acceleration ◽  
Vibration Displacement ◽  
Coupling Vibration ◽  
Slab Track ◽  
Plate Length

A vehicle-track-subgrade coupling vibration system model was proposed to analysis the influence of cell plate length to slab track vertical dynamic response. The model was built with finite element method, rail was modeled as space beam element, both track plate and base plate were modeled as shell element, the vertical connections between rail, slab and subgrade were modeled as spring-damper element. The results show that with the cell plate length increases, the vertical vibration displacement of rail, track plate and base plate have decreasing tendency; the vertical vibration acceleration of rail has increasing tendency; the vertical vibration acceleration of track plate and base plate have decreasing tendency.

scholarly journals Soil-Pile Interaction in the Pile Vertical Vibration Based on Fictitious Soil-Pile Model

2014 ◽  
Vol 2014 ◽  
pp. 1-11
Author(s):  
Guodong Deng ◽  
Jiasheng Zhang ◽  
Wenbing Wu ◽  
Xiong Shi ◽  
Fei Meng
Keyword(s):  
Dynamic Response ◽  
Separation Of Variables ◽  
Vertical Vibration ◽  
Dynamic Responses ◽  
Dynamic Force ◽  
Laplace Transform Technique ◽  
Velocity Response ◽  
Pile Interaction ◽  
Pile Model ◽  
Fictitious Soil

By introducing the fictitious soil-pile model, the soil-pile interaction in the pile vertical vibration is investigated. Firstly, assuming the surrounding soil of pile to be viscoelastic material and considering its vertical wave effect, the governing equations of soil-pile system subjected to arbitrary harmonic dynamic force are founded based on the Euler-Bernoulli rod theory. Secondly, the analytical solution of velocity response in frequency domain and its corresponding semianalytical solution of velocity response in time domain are derived by means of Laplace transform technique and separation of variables technique. Based on the obtained solutions, the influence of parameters of pile end soil on the dynamic response is studied in detail for different designing parameters of pile. Lastly, the fictitious soil-pile model and other pile end soil supporting models are compared. It is shown that the dynamic response obtained by the fictitious soil-pile model is among the dynamic responses obtained by other existing models if there are appropriate material parameters and thickness of pile end soil for the fictitious soil-pile model.

scholarly journals Dynamic Response and Its Frequency Domain Characteristics of Lateritic Soil Subgrade under Traffic Load during Construction

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Wei Bai ◽  
Kun Mu ◽  
Lingwei Kong ◽  
Wenbo Zhang ◽  
Xiu Yue
Keyword(s):  
Dynamic Response ◽  
Frequency Domain ◽  
Field Tests ◽  
Vertical Vibration ◽  
Test Point ◽  
Traffic Load ◽  
Lateritic Soil ◽  
Vehicle Speed ◽  
Guangxi Province ◽  
Distribution Law

Field tests were carried out on the compacted lateritic soil subgrade of Laibin-Mashan expressway in Guangxi Province to obtain the vertical vibration acceleration and dynamic stress amplitude of each test point under different axle loads and different driving speeds. The distribution law of the dynamic response and its frequency domain characteristics obtained by wavelet analysis emerged. The vibration of the subgrade is clearly aggravated by the increase of speed and load. Specifically, the acceleration of vehicle speed from 20 km/h to 40 km/h has a prominent effect on the vibration of subgrade, and the influence of speed on the vibration of subgrade decreases with subgrade depth. The acceleration has the greatest impact on the vibration energy in the third and fourth frequency bands.

scholarly journals The Evolving Dynamic Response of a Four Storey Reinforced Concrete Structure during Construction

2012 ◽  
Vol 19 (5) ◽  
pp. 1051-1059 ◽  
Author(s):  
A. Devin ◽  
P.J. Fanning
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Natural Frequency ◽  
Structural Response ◽  
Vertical Vibration ◽  
Fe Model ◽  
Structural Elements ◽  
Reinforced Concrete Structure ◽  
Load Bearing ◽  
Lateral Response

Structures include elements designated as load bearing and non-load bearing. While non-load bearing elements, such as facades and internal partitions, are acknowledged to add mass to the system, the structural stiffness and strength is generally attributed to load bearing elements only. This paper investigates the contribution of non-load bearing elements to the dynamic response of a new structure, the Charles Institute, in the grounds of University College Dublin (UCD) Ireland. The vertical vibration response of the first floor and the lateral response at each floor level were recorded at different construction stages. The evolution of the structural response as well as the generation of a finite element (FE) model is discussed. It was found that the addition of the non-load bearing facades increased the first floor natural frequency from 10.7 Hz to 11.4?Hz, a change of approximately +6.5%. Similarly these external facades resulted in the first sway mode having its frequency increased by 6%. The subsequent addition of internal partitions, mechanical services and furnishings resulted in the floor natural frequency reducing to 9.2 Hz. It is concluded that external facades have the net effect of adding stiffness and the effect of internal partitions and furnishings is to add mass. In the context of finite element modelling of structures there is a significant challenge to represent these non-structural elements correctly so as to enable the generation of truly predictive FE models.

scholarly journals Shaking table tests for dynamic response of a wharf with coupled batter piles.

2001 ◽  
pp. 101-113 ◽  
Author(s):  
Junji HAMADA ◽  
Takahiro SUGANO ◽  
Tatsuo UWABE ◽  
Shigeru UEDA ◽  
Hiroshi YOKOTA
Keyword(s):  
Dynamic Response ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Batter Piles

scholarly journals Quantitative Evaluation for Reinforcement Effect of Auxiliary Steel Beams Based on Running Safety and Dynamic Response

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Gong Kai ◽  
Liu Linya ◽  
Xiang Jun ◽  
Yang Haiming ◽  
Yu Cuiying
Keyword(s):  
Dynamic Response ◽  
Evaluation Method ◽  
Calculation Model ◽  
Vertical Vibration ◽  
Vibration Response ◽  
Steel Beams ◽  
Steel Beam ◽  
Allowable Limit ◽  
Running Safety ◽  
Spatial Vibration

Aiming at the existing heavy-haul railway, bridges hardly meet the transportation requirements. Based on the spatial vibration calculation model of the freight train–track–bridge (FTTB) system, the FTTB spatial vibration model under the condition of auxiliary steel beam reinforcement is established. Besides, according to the random analysis method of train derailment energy, coming up with an evaluation method of auxiliary steel beam reinforcement is based on safety and dynamic response, which is used to discuss the train safety and the change law of FTTB system vibration response. The results show that the derailment resistance of the FTTB system is increased by 22.6% after the auxiliary steel beam is reinforced. Compared with the previous speed (115.56 km/h), the speed is 132.73 km/h after the auxiliary steel beam reinforcement; at the same time, the allowable limit speed increases from 92.49 km/h to 106.18 km/h. In addition, the reinforcement of the auxiliary steel beam can not only effectively reduce the lateral vibration response of the FTTB system under the action of empty wagon but also effectively decline the vertical vibration response of the FTTB system under the action of the loaded wagon, which can meet the stability requirement for running at the speed of 90 km/h. In summary, the reinforcement of auxiliary steel beams can improve the running safety of trains, reduce the vibration response of the FTTB system, and meet the requirements of operation stability.

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