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Sun X.,Tianjin University | Sun X.,Tianjin Research Institute Water Transport Engineering | Wang Y.,Tianjin University | Han Y.,Chongqing Jiaotong University
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011 - Proceedings | Year: 2011

Based on a practical engineering, the effects of soilstructure interactions on the dynamic characteristics of the highpiled wharf were investigated, and the influences of different soilstructure constraint styles and initial earth stress on the calculation of dynamic parameters were also studied. The results of the study were the following: (a) the soil-structure interactions should be considered when analyzing the dynamic characteristics of the high-piled wharf; (b) the soil-structure constraint styles would influence the calculation of dynamic parameters, and soilstructure constrained by contact elements was recommended; (c) the consideration of initial earth stress would increase the frequency of the high-piled wharf and had much greater influences on high order, so the soil initial earth stress should be considered when performing the modal analysis of soil-wharf. © 2011 IEEE. Source


Sun X.,Tianjin Research Institute Water Transport Engineering | Zhu Z.,Beijing Institute of Water | Zhao B.,Tianjin University
Advanced Materials Research | Year: 2012

The project intends to construct steel pipe piles on both sides of trestle wharf, and the soil vibrations caused by piling construction might have an important effect on the safe service of wharf. In this paper, the dynamic signals during piling construction were recorded and recognized by NExT-ERA. Meanwhile, modal analysis through finite element model of wharf was performed. Through a comparative analysis of the two results, the first two orders of frequency for wharf were obtained. The results would lay foundation for further analysis of dynamic responses of wharf when pile locations close to wharf. © (2012) Trans Tech Publications, Switzerland. Source


Sun X.,Tianjin University | Sun X.,Tianjin Research Institute Water Transport Engineering | Wang Y.,Tianjin University | Zhao B.,Tianjin University
Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis | Year: 2013

A physical model for high-piled wharf is established to perform experimental study on the model under ambient excitation. The modal identification procedures are written by the modal identification method NExT-ERA to identify modal parameters of the physical model. The results show that the values from these two methods are very close and the error is very small, which shows the application of the modal identification method NExT-ERA to the modal identification of high-piled wharf under ambient excitation. From the experimental results, it is found that the structural dynamic response signals under ambient excitation is weak, higher order modes of structure are usually difficult to excite, and the modal parameters identified by some data are usually missing, thus it is necessary to perform the analysis combined with finite element model. Source


Zhang H.-Q.,Tianjin Research Institute Water Transport Engineering | Sun X.-P.,Tianjin Research Institute Water Transport Engineering | Wang Y.-Z.,Tianjin University | Yin J.-L.,Tianjin Research Institute Water Transport Engineering | Wang C.-Y.,Tianjin University
China Ocean Engineering | Year: 2015

There has been a growing trend in the development of offshore deep-water ports in China. For such deep sea projects, all-vertical-piled wharves are suitable structures and generally located in open waters, greatly affected by wave action. Currently, no systematic studies or simplified numerical methods are available for deriving the dynamic characteristics and dynamic responses of all-vertical-piled wharves under wave cyclic loads. In this article, we compare the dynamic characteristics of an all-vertical-piled wharf with those of a traditional inshore high-piled wharf through numerical analysis; our research reveals that the vibration period of an all-vertical-piled wharf under cyclic loading is longer than that of an inshore high-piled wharf and is much closer to the period of the loading wave. Therefore, dynamic calculation and analysis should be conducted when designing and calculating the characteristics of an all-vertical-piled wharf. We establish a dynamic finite element model to examine the dynamic response of an all-vertical-piled wharf under wave cyclic loads and compare the results with those under wave equivalent static load; the comparison indicates that dynamic amplification of the structure is evident when the wave dynamic load effect is taken into account. Furthermore, a simplified dynamic numerical method for calculating the dynamic response of an all-vertical-piled wharf is established based on the P-Y curve. Compared with finite element analysis, the simplified method is more convenient to use and applicable to large structural deformation while considering the soil non-linearity. We confirmed that the simplified method has acceptable accuracy and can be used in engineering applications. © 2015, Chinese Ocean Engineering Society and Springer-Verlag Berlin Heidelberg. Source


Sun X.-P.,Tianjin Research Institute Water Transport Engineering | Zhang Y.,Tianjin Research Institute Water Transport Engineering | Zheng F.-Y.,Tianjin Research Institute Water Transport Engineering | Qi G.-Z.,Tianjin Research Institute Water Transport Engineering
Yantu Lixue/Rock and Soil Mechanics | Year: 2014

There are many mature methods to detect the bearing capacity of single pile, but for high-piled wharf piles, as they are parts of high-piled wharf, and complex structures are built on them, at this stage, for these non-free end piles, there are no effective and feasible bearing capacity detection methods. In this paper, regional heap load method to detect high-piled wharf piles capacity is proposed, and this method doesn't destroy the original structure. The high-piled wharf piles capacity prototype testing is carried out, and the deformation displacement of while high-piled wharf, the displacement of piles, and the strain of structural elements are tested under grading loads. Also the numerical model is established to analysis the bearing capacity of high-piled wharf piles, and the numerical model is corrected by the experimental results, then the whole prototype test process is simulated using the modified mathematical model. The comparison between the numerical results and the experiment data shows a satisfactory agreement. Through comprehensive analysis, the vertical bearing capacity of high-piled wharf piles is finally determined as 1 400 kN, which could ensure the safety of the high-piled wharf, and the study results could provide experimental basis for the design of the wharf. Source

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