About Amerisurv| Contact    
Magazine | Newsletter    
Flickr Photos | Advertise    
HomeNewsNewsletterAmerisurv DirectoryJobsStoreAuthorsHistoryArchivesBlogVideosEvents
Register to receive the Amerisurv Newsletter | Also See Our LiDAR News Newsletter | RSS Feed  
advertisement


Subscriptions
Sponsored By

Software Reviews
Continuing Series
     RTN
An RTN expert provides everything you need to know about network-corrected real-time GNSS observations.
Click Here to begin the series,
or view the Article PDF's Here
76-PageFlip Compilation
of the entire series
Test Yourself

Got Answers?
Test your knowledge with NCEES-level questions.
  Start HERE
Meet the Authors
Check out our fine lineup of writers. Each an expert in his or her field.
Wow Factor
Sponsored By


Product Reviews
Partner Sites

machinecontrolonline 


lbszone.com

GISuser.com

GeoJobs.biz

GeoLearn

 

Spatial Media LLC properties

Associates

ASPRS

newsnow 

  The American Surveyor     

3D Documentation in the Restoration of Historic Buildings Print E-mail
Written by FARO   
Friday, 06 July 2012

Structural changes to historic buildings depend on the precise recording of existing conditions – an ideal application for modern 3D laser scanners

Korntal-Münchingen, July 2012. The church of St. Michael the Archangel (1735) stands in the centre of Borgo di Terzo, near Bergamo, Italy. Cracks were clearly visible in the front elevation masonry, indicating serious building damage. Due to its irregular architecture, the church – like all historic buildings – required a precise analysis of existing conditions as a basis for the renovation work.

Exact measurements are enormously important, especially with structural intervention, and they form the foundation for structural analysis using the finite element method (FEM). 3D laser scanning is superb for the accurate recording of existing conditions. Comprehensive spatial data that can be used for structural analysis with standard software solutions is quickly and easily available. At the same time, all data is available for CAD design of the restoration. Compared with classic measurement methods, laser scanning is more accurate and efficient. The equipment is easy to operate and enables 360° data capture. Laser scanning provides records in which every individual point shows the same accuracy in the spatial coordinate system. Thus, it is possible to use the generated cloud of individual points (point cloud) not only for the investigation of a building component – as would be the case in measurement with a total station – but also to automatically record structural deformations of additional building components at the same time.

As a basis for the forthcoming structural improvements to the church in Borgo di Terzo, the engineering faculty of Bergamo University made use of a FARO laser scanner and was able to record the interior of the building in a single day. A graphical approach was chosen to filter and interpolate the scanning data for the detailed investigations that followed before the renovation. This enabled use of normal architectural procedures for the building analysis: for example, systematic investigation of crack patterns in the masonry to display the damage in the orthogonal projection or a comparison of the actual geometry of a vault deformed under its own weight with its ideal geometry.

In order to be able to use the church scan data with FEM, the point cloud had to be converted from a continuous model to a numerical model. Subsequently, sections relevant to the damage investigation and orthogonal to each other could be selected. Here, element grids with a uniform spacing of 30 x 30 x 30 cm proved to be a good compromise in representing significant parts of the building structure.

In the course of 3D documentation with the FARO laser scanner, the cause of the observed damage became clear: The timber roof framework had settled as a result of earlier restoration. Both a tie anchor and upper spines resting on the vault were affected. This led to heavy deflection and severe damage to the underlying vault masonry. The current load distribution in the vault was evaluated and distribution following the planned restoration was checked, using FEM analysis. It showed that both the arched buttress supports and the corresponding anchors required renovation. In addition, the middle arch must be reinforced with a steel grid and lime mortar. The deformation of the vault under load also showed that a tie member of the vault spine had given way, suggesting replacement of this anchor. After these reinforcement measures were incorporated into the FEM model of existing conditions, a general improvement in the entire structural condition became apparent.

About FARO
FARO is the world’s most trusted source for 3D measurement technology. The Company develops and markets computer-aided measurement and imaging devices and software. Technology from FARO permits high-precision 3D measurement, imaging and comparison of parts and complex structures within production and quality assurance processes. The devices are used for inspecting components and assemblies, production planning, documenting large volume spaces or structures in 3D, surveying and construction, as well as for investigation and reconstruction of accident sites or crime scenes.
Worldwide, approximately 14,000 customers are operating more than 28,000 installations of FARO's systems. The Company's global headquarters is located in Lake Mary, Fla., its European head office in Stuttgart, Germany and its Asia/Pacific head office in Singapore. FARO has branches in Brazil, Mexico, Germany, United Kingdom, France, Spain, Italy, Poland, Netherlands, Turkey, India, China, Singapore, Malaysia, Vietnam, Thailand, South Korea and Japan. Further information: http://www.faro.com

 
< Prev   Next >

deliciousrssnewsletterlinkedinfacebooktwitter

Amerisurv Exclusive Online-only Article ticker
Featured Amerisurv Events
List Your Event Here
please
contact Amerisurv


Google
 
AMERISURV TOP NEWS

JAVAD Intros
Spoofer Buster

GOT NEWS? Send To
press [at] amerisurv.com
Online Internet Content

Sponsor


News Feeds

 
Subscribe to Amerisurv news & updates via RSS or get our Feedburn
xml feed

Need Help? See this RSS Tutorial

Historic Maps
Careers

post a job
Reach our audience of Professional land surveyors and Geo-Technology professionals with your GeoJobs career ad. Feel free to contact us if you need additional information.

 

Social Bookmarks

Amerisurv on Facebook 

Amerisurv LinkedIn Group 

Amerisurv Flickr Photos 

Amerisurv videos on YouTube 

twitter

 




The American Surveyor © All rights reserved / Privacy Statement
Spatial Media LLC
905 W 7th St #331
Frederick MD 21701
301-620-0784
301-695-1538 - fax