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建筑结构的延性可分为构件的截面曲率延性[1],构件的变形(位移)延性[2]和整幢建筑物的变形(位移)延性。构件截面有对称与非对称之分,对称构件的延性不受外界作用方向的影响,其截面曲率延性和构件变形延性都只有一个,而非对称构件的延性则不然,与外界作用的方向有很大关系,作用的方向不同,它们的截面曲率延性和构件的变形延性是绝然不同的[3]。
The ductility of the building structure can be divided into the section ductile curvature [1], the deformation (displacement) ductility [2] and the deformation (displacement) ductility of the whole building. The cross-section of the member is symmetrical and asymmetrical. The ductility of the symmetrical member is not affected by the direction of the external action. The ductility of the cross-section curvature and the deformation ductility of the member are only one, while the ductility of the asymmetric member is not. Large relationship, the role of the different directions, their curvature of the cross-section of the ductile deformation and component deformation is completely different [3].