Re:방위점(orientation keypoint)_only beam element..

Q)방위점(Orientation keypoint)이란? A)말그대로 방향을 제시해주는 점입니다. 이 방위점 개념은 앤시스에서 BEAM요소 이용시에만 적용됩니다. (제가 알기로는) 그림에서 보시는 것처럼 BEAM요소는 노드와 노드를 연결하여 생성하지만 보이기에는 선입니다.. 여기에 문제가 있습니다. /ESHAPE,1 단면보임. 즉, 둥근환봉은 빔의 단면 방향이 어디로 향하든 하중에서 응력과 변위가 같지만 H빔처럼 하중이 재하되는 위치가 웨브냐 플랜지냐에 따라 강도가 완전히 달라지는 부재가 많이 있습니다. BEAM SECTION이 비대칭인 경우 더욱 그렇습니다. ... 방위점은 이렇게 빔단면의 방향을 결정하는 점입니다. 해석코자하는 부재의 단면입력창에서 가로 세로에 대한 정보가 입력되고 방위점을 찍은 지점이 단면의 상,하를 결정하게 됩니다. 점과 가까운쪽이 아랫방향이 되는거죠.. 특히 구조에서 많이 사용하는 H빔 해석시 방위점의 결정은 매우 중요합니다. SOLID처럼 3D모델링될때는 필요치 않습니다.. VM217을 참조하세요.. C:\Program%20Files\Ansys%20Inc\v90\CommonFiles\HELP\en-us\ansyshelp.chm::/Hlp_V_VM217.html 사진은 한국형경전철의 안내레일 해석자료입니다. 단면의 관성모우멘트값이 방향에 따라서 3배차이가 있음을 알 수 있습니다. LATT, MAT, REAL, TYPE, --, KB, KE, SECNUM Associates element attributes with the selected, unmeshed lines. PREP7: Meshing MP ME ST DY <> PR EM <> FL PP ED MAT, REAL, TYPE Material number, real constant set number, and type number to be associated with selected, unmeshed lines. -- Unused field. KB, KE Beginning and ending orientation keypoints to be associated with selected, unmeshed lines. ANSYS uses the location of these keypoints to determine how to orient beam cross sections during beam meshing. Beam elements may be created along a line with a constant orientation by specifying only one orientation keypoint (KB), or a pre-twisted beam may be created by selecting different orientation keypoints at each end of the line (KB and KE). (For a line bounded by two keypoints (KP1 and KP2), the orientation vector at the beginning of the line extends from KP1 to KB, and the orientation vector at the end of the line extends from KP2 to KE. The orientation vectors are used to compute the orientation nodes of the elements.) SECNUM Section identifier to be associated with selected, unmeshed lines. For details, see the description of the SECTYPE and SECNUM commands. Notes The element attributes specified by the LATT command will be used when the lines are meshed. Lines subsequently generated from the lines will also have the attributes specified by MAT, REAL, TYPE, and SECNUM. If a line does not have these attributes associated with it (by this command) at the time it is meshed, the attributes are obtained from the then current MAT, REAL, TYPE, and SECNUM command settings. In contrast, the values specified by KB and KE apply only to the selected lines; that is, lines subsequently generated from these lines will not share these attributes. Similarly, if a line does not have KB and KE attributes associated with it via the LATT command at the time it is meshed, ANSYS cannot obtain the attributes from elsewhere. See the discussion on beam meshing in Meshing Your Solid Model in the ANSYS Modeling and Meshing Guide for more information. Reissue the LATT command (before lines are meshed) to change the attributes. A zero (or blank) argument removes the corresponding association. If any of the arguments MAT, REAL, TYPE, or ESYS are defined as -1, then that value will be left unchanged in the selected set. In some cases, ANSYS can proceed with a line meshing operation even when no logical element type has been assigned via LATT,,,TYPE or TYPE. See Meshing Your Solid Model in the ANSYS Modeling and Meshing Guide for more information about setting element attributes. Menu Paths Main Menu>Preprocessor>Meshing>Mesh Attributes>All Lines Main Menu>Preprocessor>Meshing>Mesh Attributes>Picked Lines