: STEPPING INTO THE FUTURE WITH THE PAST HYBRID MODELLING IN THE BIM PROCESS CARL BROOKES 8 DECEMBER 2017 INTRODUCTION Very quick summary of BIM process Comparing New build with existing assets 3D model and drawing production Different processes and drivers What is Hybrid modelling and BIM? 1. Harmondsworth barn The application of BIM within a heritage context Research project for Historic England covering some relevant topics 2. Kings cross, the lighthouse building BIM contributed to unlocking this project ENGINEERING SIMULATION MY BACKGROUND DEMOLITION WITHOUT UNDERSTANDING BEHAVIOUR Blarnacrag Viaduct, UK THE RISK DEMOLITION WITHOUT BRACING BIM PROCESS COMPARING NEW BUILD WITH EXISTING ASSETS A VERY QUICK SUMMARY OF THE PROCESS DEMOLITION WITH BRACING MODIFICATION TO RESTRAIN MASONRY VIADUCT Reproduced from PAS 1192-2:2013 Specification for information management for the capital/delivery phase of construction projects using building information modelling 1
NEW BUILD BIM - THE INFORMATION DELIVERY CYCLE EXISTING AND HERITAGE SITES Significant conservation activities Benefits of the newbuild process are being recognised Challenges influencing uptake may relate to CaPex investment expected yet Opex receives greatest benefits Handover of Project Information Model (PIM) becomes the Asset Information Model (AIM) Benefits of BIM are less clear There is no handover asset information model (AIM) Existing information is likely to be a combination of forms, reports, sketches, 2D CAD etc.. Asset database in use, for instance Tribal K2 Some sort of spatial framework/model will need to be produced Ongoing conservation activities Reproduced from PAS 1192-2:2013 Reproduced from PAS 1192-3:2014 Specification Specification for information management for the for information management for the operational capital/delivery phase of construction projects phase of assets using building information using building information modelling modelling 3D MODEL AND DRAWING PRODUCTION DIFFERENT PROCESSES AND DRIVERS TOWARDS AUTOMATION ARCHITECTURE, STRUCTURES, MEP, CIVILS, HERITAGE Automated extraction of walls and services for an existing building for use within BIM Typical existing building Revit model Point cloud RGB 3D geometry model Existing traffic gantries Automated extraction of plant within an industrial facility BIM TYPICAL PROJECTS TYPICAL SIMULATION DRIVEN PROJECT POINT CLOUD OF MARY ROSE HULL 3D laser scanning point cloud AS A FEED TO BIM - MESHING DETAILED FORMS Generated with VRMesh Geometry model 2
3D MODEL USED BY OTHER DISCIPLINES: MARY ROSE NUMERICAL SIMULATION OF ATMOSPHERE USING CFD POINT CLOUD TO REVIT MODELS POINT CLOUD APPLICATIONS WITHIN HYBRID CAD Conventional process Existing environment scanned, modelled, and new equipment designed and accurately fitted. Reduces risk of expensive snags during construction Better process and very relevant to BIM for heritage Planning tunnel strengthening Use of hybrid environment to avoid modelling HARMONDSWORTH BARN THE APPLICATION OF BIM WITHIN A HERITAGE CONTEXT HARMONDSWORTH BARN & THE IRON BRIDGE Grade I listed Oak framed barn built in 1426 Grade I listed. Spans the River Severn built in 1779 NEW AND TRADITIONAL MEASUREMENT RAPIDLY GROWING DATA ACQUISITION METH0DS CLASSIFICATION OF SURVEY TECHNIQUES AND PROCESSES Generally mass data collection Point clouds Direct or processed Classes based on Range and point cloud density Typical cost (low, medium high) Potential application given 3
LEVEL OF DETAIL (HARMONDSWORTH BARN EXAMPLE) LoD based on Potential uses Model tolerance Listing grade Once LoD is established survey class provides options for measurement and data acquisition methods Higher LoDs have object based geometry modelling Similar tables produced for 2D information, archive drawings, sketches, 2D CAD Simple viewers are important too for desktop inspection LEVEL OF DETAIL HARMONDSWORTH BARN EXAMPLE LoD 1 L1 - Ground based photogrammetry LoD 3 M3 - Static tripod supported laser scanners HYBRID ENVIRONMENTS Living bridges of India It is often impossible, within reasonable effort, to represent existing assets with new-building BIM tools. LEVEL OF DETAIL HYBRID ENVIRONMENTS (HARMONDSWORTH BARN EXAMPLE) As before, LoD based on: Potential uses Model tolerance Listing grade Once LoD is established survey class provides options for measurement and data acquisition methods Big advantage no object based geometry modelling of existing fabric Spatial framework for tagging information (links) LoD H1 EXAMPLE POINT CLOUDS WITH LINKS TO SUPPORTING MATERIAL WORKING IN A HYBRID ENVIRONMENT ONLY INTERVENTION AND POSSIBLY INTERPHASE MODELLED AS OBJECTS LoD H3 L3 - Low resolution, medium range handheld laser scanners Shows proposed new beam/tie Software: Software: ReCap, Revit Revit and Recap 4
COMPARING DATASETS TIME DEPENDANT DATA IS IMPORTANT Useful to track major changes Missing parts and new additions Image compares laser point clouds from 2013 pre-conservation with 2015 postconservation Red indicates parts removed Software: Pointools V8i, CloudCompare, in-house post-processing software COMPARING DATASETS SMALL CHANGES Monitoring small changes Condition monitoring Image compares point clouds from 2013 preconservation photogrammetry with 2015 postconservation KINGS CROSS, THE LIGHTHOUSE BUILDING BIM CONTRIBUTED TO UNLOCKING THIS PROJECT KINGS CROSS, THE LIGHTHOUSE BUILDING KINGS CROSS, THE LIGHTHOUSE BUILDING POINT CLOUDS AND LASER AIDED MODELLING 5
POINT CLOUD POINT CLOUD POINT CLOUD STRUCTURAL ANALYSIS BIM EXISTING AND PROPOSED MONITORING COMPARING POINT CLOUDS MAJOR CHANGES 6
KINGS CROSS, THE LIGHTHOUSE BUILDING SIMPLER WAYS OF VIEWING 3D DATA SETS AND BIM 3D PANORAMIC VIEWERS BIM MODELS, BIG DATA SETS AND SIMULATION RESULTS Energy from waste example showing BIM model (top), simplified model, numerical mesh, predicted air temperature results 3D PANORAMIC VIEWERS BIM MODELS, BIG DATA SETS AND SIMULATION RESULTS: RAMVIEW360 RAMView360 link Point cloud, photography and monitoring data RAMView360 is a tool developed by Engineering Simulation Team in Ramboll UK. It allows anyone to view 3D BIM models, big data sets and simulation results all within a web browser LINKED PANORAMIC VIEWERS ENHANCED DRAWING CONTENT LINKED PANORAMIC VIEWERS ENHANCED DRAWING CONTENT RAMView360 link Link to BIM model to provide additional information on phone or tablet (Limited access Beta version) Browser example - link to BIM model to provide additional information on phone or tablet RAMView360 link (Limited access Beta version) 7