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重型机械车間的高度常在30公尺以上,桥式吊車載重量在400吨以上,跨度在70公尺以上。这类車間常采用钢結構(見圖1)。若柱的高度大,应复核柱因吊車作用而产生的变形。为了便于制造截面大的柱子,苏联生产有厚腹鈑工字鋼:工40К-135、工40К-205等(见圖2)。其优点是能使柱截面采用的鋼材种类减少,从而节省劳动量。在吊車超重量大的車間里,屋架下弦常常是受压的,所以应該复核縱向弯曲;如下弦受压,最好增加下弦撑杆,以便减少縱向弯曲的計算長度,縮小屋架下弦截面。苏联在吊車超重量
The height of heavy machinery workshops is often more than 30 meters, and the weight of bridge cranes is more than 400 tons and the span is more than 70 meters. This type of workshop often uses steel structures (see Figure 1). If the height of the column is large, the deformation of the column due to the effect of the crane should be reviewed. In order to facilitate the manufacture of pillars with large cross-sections, the Soviet Union produced thick-bellied I-beams: 40K-135, 40K-205, etc. (see Figure 2). This has the advantage of reducing the number of steels used in column sections and saving labor. In the heavy-duty workshop of a crane, the truss bottom string is often under pressure, so longitudinal bending should be reviewed. When the strings are under pressure, it is better to increase the bottom chord to reduce the calculated length of longitudinal bending and reduce the truss cross section. Soviet overweight crane