lower chord

基本解释

The lower chord of a vierendeel truss, when loaded, is subjected to the combined action of prestressed compression, large axial tension, moment and shear.
空腹屋架下弦处于预压力、强大的轴拉力、弯矩和剪力共同作用下工作。
End face with a gap, no boss butt is refers to the upper and lower casing left a certain gap between the upper and lower main chord rod end face at the same time contact.
端面无间隙对接是指将套管与主弦杆焊接后，端面经过机械加工，上、下主弦杆与套管端面依靠螺栓外径与套管内径定位对接。
End face with a gap, no boss butt is refers to the upper and lower casing left a certain gap between the upper and lower main chord rod end face at the same time contact.
端面有间隙、带凸台对接外形是指在标准节上部主弦杆上焊有定位凸台，定位凸台伸人另一标准节主弦杆内，上、下套管之间留有一定间隙配合定位。