| Summary: | 碩士 === 國立成功大學 === 土木工程學系 === 102 === SUMMARY
This integrates the concept of Building Information Modeling, (BIM) and structural design, using 3D profession modeling software Tekla Structure as the BIM platform to conform the software of structural mechanic analysis SAP2000.Tekla Structure is used to establish structural model, section information, material character, and standard of design. Then, the model is transmitted to the input of SAP2000 for the mechanical analysis and structural design. The result is returned to Tekla Structure to synchronization structural models.
Keywords: building information modeling, structural design, structural analysis, fluid dampers.
INTRODUCTION
There are a lot of high buildings in Taiwan. Taiwan is on the site of seismic zone. In this research, using building information modeling to analysis and design of a ten story building which is installed by damper system after structure is well designed. And then the efficiency of the damper installation policy is discussed.
Use Tekla Structure as building information modeling platform software, SAP2000 as mechanic analysis software. The model is subjected to El Centro earthquake in X and Y directions. The allowable stress method AISC-ASD 89 is selected as the structural design specification in the SAP2000 iteration design procedure. Additional aseismatic design is then performed by the installation of dampers in various policies by checking the displacement, velocity, acceleration, and control rate in the X-direction of the top floor for each of the cases.
Tekla Structure, a building information modeling platform software on the establishment of a simple structure can fully integrate, beams, columns, and plates, and then transmits into SAP2000 without problems. If the structure contains special components, such as fluid dampers, it cannot successfully transmit directly to the Tekla Structure, but should be established by ourselves. The most efficient way to install damper in this case as concluded is setting the dampers at the fifth floor.
MATERIALS AND METHODS
In the case, Tekla Structure is used to model a ten story building, with 30 meters in total height and 3 meters height for each story, both of width and length in X- and Y- directions are 4 meters, as shown in the Fig. 1. Both of beams and columns are 100X100X6X8’s wide-flange cross section by A36 steel. The thickness of concrete plate at each floor is 20 centimeters and 280kg/cm²is selected as the yielding stress of the concrete.
Figure 1. Schematic diagram
The software package SAP2000 is used for the structural analysis and structural design. The ten story building is assigned to subject the 1940 El Centro earthquake both in X- and Y- direction. Columns and beams for each of the floors are group assembled. AISC ASD89 specification is selected in the design work.
As the building is well designed dampers are installed in various policies on the building for the purpose of aseismatic. Totally 12 cases of installation policies are considered. For each of story, individually, two dampers with damping coefficient C as 2000kN-s/m’s are installed in X- and Y- directions. That will give us ten cases. The other two cases come from raw building and install 200kN-s/m’s damper uniformly at every floors both on X- and Y- directions. According to the result obtained in these 12 cases, another case by install 1000kN-s/m’s dampers on 5th and 6th floor as the 13th case is also analyzed for comparison. In addition, in the 13th case, input load is considered as 5 times of the El Centro earthquake.
RESULTS AND DISCUSSION
A ten story aseismatic building is designed by means of building information modeling platform. Computer software package SAP2000 and Tekla are linked for the purpose done. Various installation policies by viscous dampers are applied after the ten story building is well designed.
Results are presented in natural frequencies and the displacements, velocities and accelerations at the roof point, with the comparison and control efficiencies of each cases.
Figure 2. Displacement time history of raw building
CONCLUSION
1. Experience of using BIM (building information modeling)
The basic concept of BIM, the work presented is belongs a part of BIM’s application. Here are some of the experiences and ideas about this system.
Tekla Structure is a valid software to model the considered buildings and structures. It is really convenience to establish the models of structures with complicated elements. But it still do not capable to model some of the special structural elements such as damper, isolation support… etc. That is why it fails to link the SAP2000’s design result returns to Tekla platform.
SAP2000 is one of a popular structural analysis software with powerful analysis and design functions. But it still cost time to define the structural elements for complicated structures.
2. Investigation of control efficiency
The control efficient when dampers are installed is investigated for the presented cases.
Results show, as for the presented cases, when the dampers are installed on the 5th floor, it gives the best control results.
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