求PKPM中LTCAD的教程，毕业设计最后一天了

SPACE GASS is a general purpose structural analysis and design program for 2D and 3D frames, trusses, grillages and beams. It comes with a full complement of features that make it suitable for any job from small beams, trusses and portal frames to large high rise buildings, towers, cranes and bridges. Items such as graphical input, polar coordinates, elastic supports, pin-ended members, tension-only members, rigid member offsets, moving loads and non-linear analysis are all standard features.

楼梯照书上的例子手算吧，很简单的，而且对自己有好处，以后心理就有数了。