平面、空间桁架的计算程序：1、是计算在载荷作用下的平面桁架位移以及杆件的轴力。轴力符号规定，受拉为正，受压为负。另外还哼计算支座反力。 2、对桁架的节点编号，采取先编可动节点，接着再编固定节点。 3、计算多工况问题-Plane, the calculation of space truss: 1, is included in the load displacement of the plane truss, as well as the axial force rod. Symbol provides axial force, tension is positive, compression negative. In addition, calculation of bearing reaction force to sing. 2, the node number of the truss, to take first for mobile nodes, and then for a fixed node. 3, calculating the number of working condition issues