Application On The Design Of Steel Tubular With Couplers Scaffold Based On BIM Technology

Recentely,BIM technology is experiencing the trend from design modeling to model data application.In the domestic,BIM technology is also experiencing heat from impetuous to rational.However,in fact,the research on BIM technology is still in the initial stage.Scaffold engineering is an important link in engineering construction project.The traditional scaffold project design is almost entirely depending on the timbermen,who reference 2D drawings to install the scaffold by experience at the construction site,with no visual model construction.At this time,if we do some wrong jobs,such as improper design,calculation errors and so on,the temporary support system can lead to security risks or material waste.As a matter of fact,it is easily to hear that the improper design of scaffold cause significant economic losses and casualties.Therefore,it is of great practical value and economic value to use BIM technology to carry out the two development on the BIM platform and realize the rapid and safe modeling of scaffold.In the domestic market,there are scaffold modeling softwares including PMSbim and Glodon,which are based on 2D platform development,although do 3D visualization tests,but cannot be obtained accurately with the parameters of each component,in many areas are still confined to the 2D platform restrictions,so in our country,we lack of real scaffold modeling softwares based on BIM platform.The subject of this thesis is the development of scaffold program under BIM platform.First of all,to learn and master the knowledge of steel tubular scaffold,to clarify the scaffold whole life cycle of construction,the scaffold erection in practical engineering,the analysis of scaffold accidents and to sum up a flexible and accurate calculation scheme of scaffold safety,which meets the requirements of latest technical code.Secondly,to summarize the basic theory of BIM,which are needed in this paper.The main contents including summarize application of BIM technology in various stages of the whole life cycle of the building,the scaffold design is mainly in the design and construction stages;summarize the development and function of BIM criterions at home and abroad,emphasize the importance of standards for the promotion of BIM technology;introduce the BIM series softwares,and we choose Autodesk Revit as the scaffold application development software.Next,we create the scaffold family libraries in Revit,this is the preparation of the scaffolding modeling program before it is developed.The construction of scaffold family libraries are as follows: steel pipe scaffold family(including horizontal tube,bottom reinforcing tube,diagonal bracing and cross bracing),coupler family(including fastener coupler,rotating coupler and sleeve coupler),tie member family,scaffold board family,toe board family,adjustable forkhead family,base plate family,overhanging steel family,and safety net family.Then,the secondary development of Revit was studied.Through the aid of Revit API,the scaffold program is developed in the Visual Studio environment,including special project safety calculation of scaffold and intelligent modeling of scaffold,the two most of the expansion of Revit function.A detailed description of the Revit API is given,and then an overview of the object-oriented design of the C# language is presented in this paper.This paper chooses external command and external application,these two ways as the tools for secondary development of Revit.Finally,in view of the above research results,the plug-in is tested in the practical project.We load the scaffold software into Revit,find the "steel tubular scaffold" panel under the " attached module " label,there are three buttons,which are respectively "parameter setting","export calculations" and "intelligent model".The specific operation is to create a built-in family consistent with the shape of the residential building model in the project,enter scaffold parameter information,after calculating and checking,Revit can build the scaffold model intelligently.The program can realize a 3D model of scaffold in a short time,the designers and constructors could obtain rich engineering information from the generated model,and greatly improve the efficiency of their work.I added a chapter particularly in the end.A methodology to seek a network graph's P-center of gravity utilizing graph theory was provided,focusing on the optimal arrangement of tie members in wind-induced response of double pole steel tubular scaffold.First of all,to create finite element model,extract the maximum node displacement of scaffold,to transform the actual problem into a network diagram of the study.Then figure out some mathematical parameters,namely,the vertex weights,boundary value and the weighted distance matrix.Last but not least,the lower bound of this algorithm will be calculated,so we could analyse of the center of gravity to determine the needed location of tie members.