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A parametric finite element analysis (FEA) has been carried out on X-joints of longitudinal plate-to-circular hollow section (CHS) loaded by in-plane bending in this study. The finite element models have been validated through comparisons with previous test results of X-joints. The models were utilized with different parameters such as; plate width-to-chord diameter ratio (η), chord diameter-to-thickness ratio (2γ), utilization ratio (U or n), and yield strength of the chord (Fy). The design strengths of joints suggested by current design equations (AIJ 2002, AISC 2005, AISC 2011, CIDECT 2008 and KBC 2009) were compared with the results of the FEA. Following this, a modified new design resistance equation, based on the FEA results, was proposed to more accurately estimate the capacity of X-joints.
Current design practice of electric transmission tower is based on allowable stress design. Design strength of compression member of the electric transmission tower is determined by buckling strength of member itself without considering the joint strength. There is a possibility of joint failure prior to buckling of member. Therefore, in this study, joint strength is calculated for various member force, and shape of joint and database of strength was established. These data was compared with the member strength obtained from previous research based on equivalent nonlinear analysis technique. Finally, practical evaluation and design method to distinguish failure mode in member of electric transmission tower is proposed.
Current design practice of electric transmission tower is based on allowable stress design. But, it is difficult to find the reason for collapse of the transmission tower by the above design approach since the collapse occurred by secondary large deformations based on material and geometrical nonlinear behavior. The influence factor for the nonlinear behavior is mainly residual stress, initial imperfection and end restraints on members. In past study, necessity of the nonlinear analysis is examined through the comparison between elastic analysis and inelastic analysis. In this study, to reduce the complexity caused by the nonlinear analysis, a new analytical method (equivalent nonlinear analysis technic) is proposed. To confirm the reliability of the proposed, the computed ultimate load of transmission tower using the method was compared with that of the nonlinear finite method. Also, electric transmission tower experienced actual collapse in the past was analyzed by the proposed method and the cause of collapse was examined. Finally, the result of this study will be utilized in order to apply LRFD design approach to electric transmission tower design specification.
본 연구에서는 편심률과 세장비가 고려된 가셋트-강관 접합부의 거동 및 극한 강도를 파악하기 위하여 실험 및 유한요소 해석을 수행하였다. 실험체는 가력장치의 용량제한으로 1/3 축소모형 실험체로 제작되었으며, 유한요소해석 모형도 이와 동일한 형태로 설정하였다. 여기서 본 연구이 주된 관심은 횡력에 의한 편심이 접합부 극한 강도에 미치는 영향을 파악하는 것으로 연구결과 세장비, 횡력비 가셋트 플레이트 길이 축소가 가능하 편심접합 사용의 가능성을 파악하였으며, 실험결과와의 비교를 통해 설정된 유한요소해석 모형의 검증도 수행하였다. Experiments and the parametric based on finite element model were conducted to investigate the behavior and strength of a gussettube connection concerned with eccentricity and selenderness ratio. Because of limitations in loading capacity the specimens were fabricated with 1/3 scale of full size. Of primary interest here are the ultimate strength of connections having eccentricity caused by lateral loads. As a result the effect of eccentricity on the buckling strength was examined and the validity of the finite element model adopted in this study was verified through comparing with test results.
리브로 보강된 가셋트-강관 접합부의 거동은 매우 복잡한 양상을 나타내므로 이론적인 방법으로는 극한강도평가가 불가능하다. 그러므로 본 연구에서는 리브로 보강된 K형 가셋트-강관접합부의 유한요소 해석결과를 실험결과와 비교 분석하여 그 타당성을 입증하고, 유한요소해석에 의한 접합부의 거동을 파악하고 극한강도를 추정하였다. 또한 횡력비, 편심률, 가셋트 길이를 고려한 유한요소해석으로부터 보강효과를 파악하였으며, 보강플레이트의 길이, 높이, 두께의 변화에 따른 해석을 수행하여 합리적인 보강방법을 제안하였다. It is almost impossible to evaluate the ultimate strength theoretically, because the behavior of Gusset-Tube connection stiffened with rib-plate is considerably complicate. Therefore in this study a finite element model of gusset-tube connection stiffened with rib-plate was established. The validity of finite element analysis was examined through comparing with previous experimental result and the behavior and strength of the connection was examined. From the parametric study considering lateral force ratio, eccentricity, gusset length based on finite element model, the stiffened effect was estimated and stiffening method was proposed.