正多边形气柜壳体的壁板简化分析方法研究

Study on Simplified Analytical Method for the Wall Plate of Regular Polygon Gasholder Shells

建设大型储气柜是冶金行业向大型化发展的需求。我国虽已建造了一些的正多边形气柜,但理论研究不足,尚无专用设计规程。为了提供气柜壳体在储气压力作用下的实用设计公式,根据正多边形气柜壳体的壁板的构造形式和储气压力下的受力特征,先考虑了两种不同壁板支座的简化形式:两端固接(2F)和一端固接一端转动弹簧支座(1F1R),然后引入狭长板条假定,按无限长薄板大挠度弯曲理论分析壁板,推导出壁板的变形和内力公式。分析了不同支座简化形式对计算精度的影响,以视角焊缝连接为铰接的转动弹簧支座为简化计算模型所得公式的计算值与有限元ABAQUS值和实测值吻合较好,验证了该分析方法的可行性和公式的可靠性。所应用的理论、计算模型和所推导的公式可为气柜壳体设计和相关规程的制定提供参考。

It is necessary to construct great size gasholders for the large-scale development of metallurgical industry.Being lack of theoretical study,although some regular polygon gasholders have been built in China,there is no design regulation to follow.In order to get the practical design formulas for the outward shell under gas pressure,based on the configuration and the force characteristics,two simplified forms of the supports were analyzed：two fixed ends（2F）,one fixed end and one rotational spring support（1F1R）.According to the large deflection bending theory of infinitely long thin plate,the wall plate was analyzed by introduction of the strip assumption.The deformation and the internal force formulas of wall plate were deduced.The effects of different simplified supports on calculation precision were analyzed.One calculation model with the rotational spring support which regards the fillet welding as the pin joint was preferred.The values of the formula based on this model match well with the ABAQUS＇s and the testing results.Hence,the present theories,computation module and formulas can be referred in the design of gasholder shell and the establishment of relating specification.