Usually there are 12 categories which are bolt , stud, screw, nut , self tapping screw, wood screw, gasket, retainer ring, pin, compositemember, bolting, and soldering lamp.
To give the formula of cross-section capacity in eccentric compression, the theoretical model of compositemember and judgment method of large or small eccentric compression have been brought forward.
目的确定组合构件的理论模型和大小偏心的判断方法，提出偏心受压正截面承载力公式。
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Steel-concrete composite beam is a kind of flexural member composed by concrete slab and steel beam via shear connectors.