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引言在钢筋混凝土结构抗震设计中,一般是允许某种程度的破坏的,否则将使设计成本太高。为正确地贯彻这一设计思想,要求建立估算随机地震情形下结构的破坏模型。钢筋混凝土结构由于高应力和应力反复的联合作用而受到削弱或遭受破坏,因而任何破坏准则不仅包括最大响应,而且应包括反复加载的影响。现行的抗震设计规范,如UBC和SEAOC,基本上是根据单向荷载作用下弯曲特性的研究结果制定的。在单向荷载作用下,脆性破坏模式,如剪切破坏和钢筋界面破坏,可以通过构件细部构造措施
Introduction In the seismic design of reinforced concrete structures, damage is generally allowed to some extent, otherwise the design cost will be too high. In order to correctly implement this design idea, it is required to establish a structural damage model under random seismic conditions. Reinforced concrete structures are weakened or damaged due to the repeated combination of high stress and stress, so any failure criterion includes not only the maximum response but also the effects of repeated loading. The current seismic design codes, such as UBC and SEAOC, are basically based on the results of studies on the bending properties under unidirectional loading. Under the action of one-way loading, brittle failure modes, such as shear failure and interfacial failure of reinforcement, can be achieved through the detailed construction of the components.