the typical joints of beams with columns (corner) column detail translators and joints for beams and lightened 1- do not join more than 50% of the area of the same section. 2- in case of not joining in the indicated areas or with the specified percentages, increase the joint length by 70%. download 2 storey house column beam layout plan CAD drawing DWG file. 3- for lightweight and chat beams, the lower steel will flange on the supports, being the length of joint equal to 25 cm. for 3/8 "and 35 cm iron. for 1/2" or 5/8 "