导出了基于双剪屈服准则的钢筋混凝土球扁壳的屈服条件，并利用此屈服条件求解出其极限荷载。
The yield conditions of axisymmetric circular plate and shallow spherical shell of reinforced concrete based on Twin shear stress yield criterion are presented in the paper.
分析了剪胀和软化程度对球孔扩张时的应力、位移、塑性区半径及极限扩张压力等方面的影响，并将大、小应变理论的结果进行了比较。
The influence of softening extent on stress, displacement and the radius of plastic zone during expansion as well as the extreme expansion pressure are studied.
钢结构系列：钢结构用高强度大六角头螺栓，扭剪型螺栓连接副，钢网架球节点用高强度螺栓，焊钉，钻尾丝等。
Steel Series: steel with high strength large hexagon head bolts, torsion shear bolt connections made, the steel truss joints of high strength bolts, studs, drill the end of wire.
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