SAP2000常见问题(6)

（a）应该是平面外支撑的问题吧，Unbraced Length Ratio(Minor，LT)中的数值并不改变程序计算出来的结构的内力，但是却能改变杆件的承受力和变形的能力，数值越少，就是说不支撑的距离越短，承载能力也越强，那么ratio肯定就越小，结构会越稳定。摩蟹族的浪子

（b）主要用于钢结构，混凝土中的稳定问题考虑较少，因为混凝土构件截面都会比较大，惯性矩大而回转半径小，所以一般满足稳定，而且一般稳定问题一般是出现在强度破坏之后的，更多的考虑的是强度和延性了 摩蟹族的浪子

（c）Unbraced Length Ratio(Minor, LT) means if the distance between lateral bracing. If the ratio is small, the capacity of the beam might reach 0.66Fy. If the ratio is small enough, it will reach 0.66Fy. On the other hand, if the ratio is high, then then capacity is low. a portion of 0.66Fy. Refer to\will know how to calculate the bending strength of steel for difference unbraced length. By the way, the ratio is always between 0 and 1. If it is 0.33, it means that there are two braces between the end of the member. and the unbraced length is one third of the total length of the total length of