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BIM for the Underground-An enabler of trenchless construction

Underground Space 2020年第4期5卷 354-361页

作者： David Chapman stylianos providakis Christopher Rogers Department of Civil Engineering University of BirminghamBirmingham B152TTUK

The subsurface space in urban areas is an important ***,the information available on this environment is relatively poor compared to above ground *** paper proposes a Building Information Model(BIM)for underground applications as means to address this information *** creation and progressive update of BIM for a constructed artefact ensures that data on the structures is available and can be used throughout its lifetime.A BIM for underground applications integrates data on surface structures,such as buildings,and subsurface infrastructures,such as pipes,along with details of the surrounding ground,the associated soil and rock properties and groundwater regime into a single *** approach is demonstrated by applying it to trenchless construction operations,including a microtunnelling project for a new *** data from this extended BIM concept can be interactively used with analysis packages to conduct risk assessments for new construction *** also shows how BIM for the Underground can be used throughout the planning,construction and post-construction stages of a project,and,importantly,how this information can be available for future projects.

关键词： Trenchless BIM Underground Pipe jacking Microtunnelling Horizontal directional drilling

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2-D Statistical Damage Detection of Concrete Structures Combining Smart Piezoelectric Materials and Scanning Laser Doppler Vibrometry

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Structural Durability & Health Monitoring 2018年第4期12卷 257-279页

作者： Costas P.providakis Stavros E.Tsistrakis Evangelos V.Liarakos Technical University of Crete School of ArchitectureKounoupidianaChaniaGR 73100Greece

In the present study a new structural health monitoring (SHM) technique isproposed as well as a new damage index based on 2-D error statistics. The proposedtechnique combines the electromechanical impedance technique (EMI) which is based onthe use of piezoelectric Lead Zirconate Titanate (PZT) patches and Scanning LaserDoppler Vibrometry (SLDV) for damage detection purposes of concrete structures andearly age monitoring. Typically the EMI technique utilizes the direct and inversepiezoelectric effect of a PZT patch attached to a host structure via an impedance analyzerthat is used for both the actuation and sensing the response of the PZT-Host structuresystem. In the proposed technique the attached PZTs are actuated via a function generatorand the PZT-Host structure response is obtained by a Scanning Laser DopplerVibrometer. Spectrums of oscillation velocity of the surface of the attached PZTs verticalto the laser beam versus frequency are obtained and are evaluated for SHM *** damage detection approach also includes the use of a damage index denoted asECAR (Ellipse to Circle Area Ratio) based on 2-D error statistics and is compared to theRoot Mean Square Deviation (RMSD) damage index commonly used in SHMapplications. Experimental results include ascending uniaxial compressive load ofconcrete cubic specimens, ascending three point bending of reinforced concrete beamspecimens and early age monitoring of concrete. Results illustrate the efficiency of theproposed technique in damage detection as well as early age monitoring as, in the firstcase, both severity and location of damage can be determined by examining the values ofdamage indices for each damaged state and in the early age monitoring case damageindices follow the strength gain curve.

关键词： Concrete damage detection Scanning Laser Doppler Vibrometry PZT error statistics

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