Lateral buckling supports definition
Lateral supports option allow to define out of plane bracing for beams or columns. It is two possibilities to do it - from Lateral supports definition window or in Lat.buck tab of Timber Codecheck window.
Two separate frames in Lateral Supports Definition window are represented. It is possible to define different load attachment position related to section, eg. for each member in upper frame. Lower frame allow to define member end fixation type and distances from member begin to each Lateral support for upper and lower flange.
Lateral buckling supports input:
- for supports input the integer and decimal numbers are used
- more than one input value must be separated by comma sign
- decimal values are rounded to 5 symbols after comma
- for supports input in equal distances along the member an input form NUMBERx is used, where NUMBER is an integer meaning the supports quantity, eg. 4x. If NUMBER entered as a decimal, it is rounded down with integer precision (eg. 2.7 rounded to 2)
- input form NUMBERh means the supports positioning in NUMBER value distances as many times as many distances fit in member length, eg. 4h
- input symbol L puts the single support at the end of a member
- lateral buckling supports distances are calculated from begin of a member
Graphical representation of lateral supports and load attachment position will be displayed in Structure View when defined Lateral supports properties will be applied to a proper member.
For verification of lateral torsional stability of members in bending or bending and compression only effective supports will be taken into account during estimation effective length - lef. It is assumed that only supports restraining compressed side (top/bottom) of cross section can be taken into account. In case represented in the picture below we will have such values for - lef :
- Support S1 is effective, so lef = 1,1 m and 0,65 m;
- Support S2 is not effective and support S3 is effective, so lef = 1,7+1,7 =3,4 m and 1,85m .
