Stability Of Stiffened Plates Carrying Capacity Study

It is a steel era in modern times. Around us there is full of steels, as if without it we can not live for a moment. Steel structure is classified as plate, beam, bar and shell. Each kind of steel structure has its own special usefulness or advantages over the others. In this paper, plate is discussed, especially the stiffened plate.The plate is wildly used in every walk of life, not only train or car on the land, but also plane in the air, even steamship on the sea. In order to lighten the weight of structure, the plate becomes more and more filmily compared with the width and length of the plate. But when the plate is over filmy, it will cause plate buckling just like a bar's buckle. How to settle the contradiction between the cost and the weight? Mans find a way to overcome it, that is to append one or more stiffeners on the thin plate. It is well known that the critical bucking load of a plate is depending on the ratio of width to thickness, by using stiffeners, the ratio of width to thickness is smaller, because the stiffeners divide the plate into more small parts, which is called as part plate, and its buckle is called as the plate's critical bucking.However, the plate's critical bucking problem is very complicated to get an accurate answer, the rather that the stiffeners is taken into account. In the practical, it is always considered that by using bigger and bigger stiffener the structure is more and more safe. Although doing it in this way can make sure of the safety, if the stiffener is too big, it will make the structure too weight and diseconomy. In fact, at the beginning while the stiffeners become bigger, the critical value of buckling load will increase, but when the buckling load is reach to critical, it will be not benefit to the critical value of buckling while the stiffener is bigger and bigger, just as the experiences and tests showing. In the crane design criterion, there are two term wealways used--rigid stiffener and flexible stiffener. A rigid stiffener is a stiffener that itkeeps its own shape, not to be distorted along with the plate. So the critical value of bucking load will not increase for this kind of stiffener's getting bigger. A flexible stiffener is a stiffener that it can not keep its own shape, and distorted along with the plate. So the critical bucking load will increase for this kind of stiffener's getting bigger.The most important is that how to get the numerical value which divided the stiffener into rigid or flexible stiffener. If we have this valve, we can get the biggest critical bucking load without wasting more materials, which is what we want to see. In this paper it is included classic thin plate theory, the crane design criterion, and also...