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一、引言贮存易燃易爆气体和液体介质的钢制焊接球罐,在石油、化学工业中已得到广泛应用。球罐的结构形式一般相同,即球壳和由数根直立圆钢柱加斜拉杆组成空间网状结构,立柱上端和球壳赤道圆正切焊接成一体,柱的下端用螺栓锚固在钢筋混凝土基础上。这种结构可简化为单质点体系进行抗震分析,其自振周期公式:
I. INTRODUCTION Steel welded spherical tanks for storing flammable and explosive gases and liquids have been widely used in petroleum and chemical industries. The structure of the spherical tank is generally the same, that is, the spherical shell and a plurality of upright steel columns and oblique rods form a spatial network structure. The upper end of the column is tangently welded with the equatorial circle of the spherical shell. The lower end of the column is bolted to the reinforced concrete foundation. on. This structure can be simplified as a single-mass system for seismic analysis, and its vibration period formula: