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Journal Article 5

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BIM 1

DEM 1

DX pile 1

PBOM 1

PIV 1

Revit 1

base capacity 1

bearing capacity 1

bill of quantities 1

frame difference 1

implementation technology 1

management 1

open-ended pipe pile 1

optical-flow method 1

quantity of bearing bells 1

real-time synchronisation 1

settlement 1

soil plug 1

structure health monitoring 1

systematic technological 1

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Integration of VR with BIM to facilitate real-time creation of bill of quantities during the design phase

Jordan DAVIDSON, John FOWLER, Charalampos PANTAZIS, Massimo SANNINO, Jordan WALKER, Moslem SHEIKHKHOSHKAR, Farzad Pour RAHIMIAN

Frontiers of Engineering Management 2020, Volume 7, Issue 3, Pages 396-403 doi: 10.1007/s42524-019-0039-y

Abstract: procedures that seemed indispensable at one point can be abandoned for others, one example of which is the billof quantities (B/Q).

Keywords： virtual reality bill of quantities BIM Revit real-time synchronisation

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Design and analyses of open-ended pipe piles in cohesionless soils

Yuan GUO,Xiong (Bill) YU

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 1, Pages 22-29 doi: 10.1007/s11709-016-0314-5

Abstract: Large open-ended pipe pile has been found to be advantageous for use in transportation projects. The current design method, however, is not adequately developed. To close this practice gap, this paper first summarized different design methods for open-ended pipe piles in sandy soils. A major factor for all the design codes is to properly account for the formation and effects of soil plug. The comparison indicates that there is a large variation in the base capacity evaluation among different methods due to the complex behaviors of soil plug. To close the knowledge gap, discrete element method (DEM) was used to simulate the soil plugging process and provide insight on the plugging mechanism. The simulation results show that the arching effect significantly increases the internal unit shear resistance along pipe piles. The porosity distribution and particle contact force distribution from DEM model indicate a large stress concentration occurs at the bottom of the soil plug. Besides, nearly 90% of the plug resistance is provided by the bottom half portion of the soil column. The soil-pile friction coefficient has a significant effect on the magnitude of plug resistance, with the major transition occurred for friction coefficient between 0.3 and 0.4.

Keywords： open-ended pipe pile soil plug DEM base capacity

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Image analyses for video-based remote structure vibration monitoring system

Yang YANG,Xiong (Bill) YU

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 1, Pages 12-21 doi: 10.1007/s11709-016-0313-6

Abstract: Video-based vibration measurement is a cost-effective way for remote monitoring the health conditions of transportation and other civil structures, especially for situations where accessibility is restricted and does not allow installation of conventional monitoring devices. Besides, video-based system is global measurement. The technical basis of video-based remote vibration measurement system is digital image analysis. Comparison of the images allow the field of motion to be accurately delineated. Such information is important to understand the structure behaviors including the motion and strain distribution. This paper presents system and analyses to monitor the vibration velocity and displacement field. The performance is demonstrated on a testbed of model building. Three different methods (i.e., frame difference method, particle image velocimetry, and optical Flow Method) are utilized to analyze the image sequences to extract the feature of motion. The Performance is validated using accelerometer data. The results indicate that all three methods can estimate the velocity field of the model building, although the results can be affected by factors such as background noise and environmental interference. Optical flow method achieved the best performance among these three methods studied. With further refinement of system hardware and image processing software, it will be developed into a remote video based monitoring system for structural health monitoring of transportation infrastructure to assist the diagnoses of its health conditions.

Keywords： structure health monitoring velocity estimation frame difference PIV optical-flow method

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Computer aided process planning system based on workflow technology and integrated bill of material tree

LU Chun-guang, MENG Li-li

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 3, Pages 305-312 doi: 10.1007/s11465-006-0039-6

Abstract: To solve these questions, application of workflow technology in CAPP system based on web-integrated Bill

Keywords： PBOM systematic technological implementation technology management workflow technology

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Study on property comparison of DX pile casted in place with vario us quantities of bearing bells

Zhang Dehua,Qi Wanpeng,He Dexin

Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 26-30

Abstract:

Based on numerical simulation, bearing capacity and settlement control for DX piles are studied. The property differences of conventional straight piles, DX piles with 2 bells and DX piles with 3 bells are presented in condition of identical length, diameter, and bearing capacity. Under the same load, DX piles with 3 bells have smaller settlement than that of DX piles with 2 bells and straight piles. As to bearing capacity, DX piles with 2 bells are 1.5 times greater than that of the straight piles, while DX piles with 3 bells are 1.2 times greater than that of DX piles with 2 bells. The paper can provide theoretical references for the design of bearing capacity of DX piles during the engineering practice．

Keywords： DX pile quantity of bearing bells bearing capacity settlement