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桥式起重机的主梁应具有一定的空载上拱度,通常规定跨中上拱度为跨长的千分之一,即f=L/(1000),而且上拱曲线应为二次曲线y=
The main girder of overhead traveling crane should have a certain no-load camber. It is usually stipulated that the mid-span camber is one thousandth of the span length, ie f = L / (1000), and the upper camber curve should be a quadratic curve y =