[논문]경량구조 적용을 위한 구조 접합부 설계

남병현; 최진일

doi:10.9709/jkss.2020.29.2.095

경량구조 적용을 위한 구조 접합부 설계
Design of the Structural Connection for Lightweight Structure Application 원문보기

한국시뮬레이션학회논문지 = Journal of the Korea Society for Simulation, v.29 no.2, 2020년, pp.95 - 103

남병현 (한국과학기술연구원) , 최진일

초록
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본 논문에서는 경량구조 적용을 위한 구조 접합부 설계를 제시하였다. 압력에 대한 구조 안정성 연구를 위하여 용접부 접합부와 볼트 접합부에 대한 모델을 설계하였다. 확립된 모델의 신뢰성 검증을 위하여, 비선형 해석을 수행하였고, 실험결과와 비교하였을 때 유사한 결과를 확인하였다. 또한 비교연구를 통하여 구조설계 재료와 적합한 용접방법을 선택하였으며, 볼트의 개수와 위치에 따른 파단하중 시뮬레이션을 진행하여 응력에 따른 안정성을 분석하였다. 마지막으로, 접합부 모델을 기반으로 경량 구조를 모델링하고 구조 해석을 수행하였다. 그 결과, 용접부와 볼트체결을 적용하여 설계된 구조가 접합부를 적용하지 않은 구조에 비해 최대응력이 31.4% 감소함을 확인하였다. 이 결과를 토대로, 경량구조의 안정성 해석 시 접합부 모델링의 필요성을 확인하였다.

Abstract ▼ AI-Helper

The structural connection design for lightweight structure application is presented in this paper. Modeling of the welding zone and the bolted connection are suggested. For reliability verification of the established models, nonlinear analysis is performed and comparisons are made with the experimental data showing good agreement. Through comparison study, suitable welding method for structure materials is investigated. Also, stability analysis is performed by fracture load simulation for different number and position of bolts. Finally, based on the structural connection models, the lightweight structure is modeled and structural analysis was performed. Stability analysis of structural connection for lightweight structure design, through combination of welding and bolting process, showed a 31.4% decrease in the maximum stress compared to the structure without the structural connections. Importance of structural connection design is highlighted for lightweight structure stability analysis.

주제어

표/그림 (19)

그림 Fig. 1. A schematic diagram of the tensile test modeling
그림 Fig. 2. Dimensions of the specimen(mm) (KS B 0801)
그림 Fig. 3. Generated mesh for the tensile test modeling
표 Table 1. Mechanical properties of structural materials (Kim et al. 2009; Jin et al. 2012; Kim et al. 2007)
그림 Fig. 4. Stress distribution for tensile test modeling with different welding zones(MPa)
그림 Fig. 5. Graphs of stress against strain for experimental and analysis data
그림 Fig. 6. Graphs of reaction force against deformation for different welding methods
그림 Fig. 7. Dimensions and shape of T-flange for bolt connection(mm)
그림 Fig. 8. A schematic diagram of the bolt fastening method
그림 Fig. 9. Contour of generated mesh for the T-flange and bolt connection numerical analysis model
그림 Fig. 10. Stress distribution of T-flange and bolt connection(MPa)
그림 Fig. 11. Graphs of reaction force against deformation for different bolt connections
표 Table 2. Dimensions of the structural section steels
그림 Fig. 12. Dimension of the lightweight structure(mm)
그림 Fig. 13. Dimension of the section steel
그림 Fig. 14. Dimensions and shape of pannel(mm)
표 Table 3. Mechanical properties of pannel and steel plate
그림 Fig. 15. Stress distribution of the lightweight structure(MPa)
그림 Fig. 16. Graphs of equivalent stress against loaded pressure in C-Section

AI 본문요약
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제안 방법

The shape and dimensions of the models are shown in Fig. 1 and 2. The mesh quality study was performed to reduce the error between the simulation and the experimental data. Mesh was generated in hexahedron shape, and the reliability of analytical values was improved by reducing the mesh size(0.
The tensile test analysis of the T-flange applied with 1x1 bolts was performed, and the reliability of the analysis was verified by comparing with the experimental values. In addition, the tensile test analysis of the T-flange applied with 2x2 bolts was performed to compare the stability of the two models. The generated mesh shape is shown in Fig.
In this paper, modeling of structural connections with welding and bolting process were performed for lightweight structure application. Tensile test simulations of the specimens with various welding process were performed and the reliability of the analysis was secured by comparing with the experimental data. It was confirmed by the fracture force data that the most suitable welding method for SS400 material was the arc welding.
The tensile test analysis of the T-flange applied with 1x1 bolts was performed, and the reliability of the analysis was verified by comparing with the experimental values.
8 was used for the model. Threedimensional model was generated In order to investigate the fracture force of the bolt, numerical analysis was performed by fixing the lower end of the T-flange in x, y, and z direction, including rotations, and applying forced displacement to the upper end. The tensile test analysis of the T-flange applied with 1x1 bolts was performed, and the reliability of the analysis was verified by comparing with the experimental values.

성능/효과

Also, as shown in the above analysis results, weakest region due to stress concentration has changed and the stability was improved by 10%, even though the number of bolts was doubled. This could be explained by change in acting loads for each model.
As a result, it was confirmed that arc welding is the most suitable process for SS400 material in view of fracture force, displaying the closest value to that of SS400. Other welding zone specimens showed significantly lower fracture force data, which were considered to be inefficient in maintaining the original material strength.
Therefore, equivalent stress of 220 MPa occurred in the C-section of the model to which the structural connections were applied. As a result, it was confirmed that the equivalent stress at the C-section steel from the model with the structural connections is lower than that of the C-shaped steel from the model without the structural connections.
Verification was performed reflecting actual experimental conditions where effective stress was obtained for cross sectional area of the center of the specimen. For the SS400 specimen, without the welding process, displayed yield stress was around 344 MPa with difference of 1.7%(Fig. 5 (a)).

참고문헌 (16)

Ahn, J. H., You, J. M., Huh, J., Kim, I. T. and Jeong, Y. S. (2017), Residual clamping force of bolt connections caused by sectional damage of nuts, Journal of Constructional Steel Research, Vol. 136, pp. 204-214 doi:10.1016/j.jcsr.2017.05.019

상세보기
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상세보기
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상세보기
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원문보기 상세보기
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원문보기 상세보기
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Kweon, O. S., Yoo, Y. H., Kim, H. Y. and Min, S. H. (2012), An Experimental Study on Fire Safety Performance of Glass Wool Sandwich Panel, Journal of Korean Institute of Fire Science and Engineering, Vol. 26, No. 5, pp. 21-27 doi:10.7731/KIFSE.2012.26.5.021
Li, Y., Song, R. and Lindt, J. W. V. D. (2014), Collapse Fragility of Steel Structures subjected to Earthquake mainshock-Aftershock Sequences, Journal of Structural Engineering, Vol. 140, No. 12 doi: 10.1061/(ASCE)ST.1943-541X.0001019
Li, F., Quan, X., Jia, Y., Wang, B., Zhang, G. and Chen, S. (2017), The Experimental Study of the Temperature Effect on the Interfacial Properties of Fully Grouted Rock Bolt, Applied Sciences, Vol. 7, No. 4, pp. 327 doi:10.3390/app7040327

상세보기
Liu, W., Pan, H., Li, L., Lv, H., Wu, Z., Cao, F. and Zhu, J. (2017), Corrosion behavior of the high strength low alloy steel joined by vertical electrogas welding and submerged arc welding methods, Journal of Manufacturing Processes, Vol. 25, pp. 418-425 doi:10.1016/j.jmapro.2016.12.011

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표제어: PCR

동의어: Packet Collision Rate

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용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

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