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由优拉索夫建立的开口薄壁杆件约束扭转理论(简称开口薄壁理论),在结构的设计计算中得到广泛的应用。但近来在工程中也大量采用开口厚壁杆件(即壁厚与截面最大尺寸之比大于1/10)。这时如仍用开口薄壁理论计算,就会引起较大的误差。本文系统地推导计及壁厚局部弯曲应力的开口厚壁杆件约束扭转理论(简称开口厚壁理论)。并以上海港机厂5CS型叉车门架为例,具体论述该理论在叉车门架强度计算中的应用。
The theory of constrained torsion of thin-walled members with an opening, which is established by Eurasov, is widely used in the design and calculation of structures. Recently, however, a large amount of open thick-walled rod members have been used in engineering (that is, the ratio of the wall thickness to the maximum dimension of the cross section is larger than 1/10). At this time if still using the theory of thin-walled openings, it will cause greater error. In this paper, the constrained torsion theory of thick-walled thick-walled members considering the local bending stress of the wall thickness is derived systematically (referred to as thick wall theory). Taking Shanghai 5GP forklift mast as an example, this paper discusses the application of this theory in the calculation of the strength of forklift mast.