摘要
鉴于既有钢筋混凝土框架结构抗震性能评估中配箍不足的柱模型化方法的不足,基于集中塑性铰模型,建立了柱开裂、屈服、极限承载力直至失效的全过程能力曲线,并通过SAP2000用户自定义铰属性予以实现。经与已有试验对比,验证了该方法的可行性。最后,对一栋配箍不足的RC框架结构进行了Pushover分析。研究表明,采用程序默认弯曲铰将高估结构的承载能力及延性;默认弯曲铰和剪切铰又过低估计了结构的抗震能力,造成对结构破坏模式的误判。本文自定义铰模型可经济有效地指导既有钢筋混凝土框架结构的抗震加固。
For insufficient modeling methods of columns in seismic evaluation of existing reinforced concrete frames, based on the lumped hinge model, a capacity curve of column is proposed accounting for full states from cracking, yielding, ultimate bearing capacity to final collapse. The curve could be easily used through user-defined hinge property by SAP2000. By means of comparisons with test results of others, the reliability of the method is validated. Finally, an existing frame structure with insufficient transverse reinforcement is evaluated by pushover analysis. The results show that using the default flexural hinge generates an exceedingly high evaluation of the capacity and ductility of the structure, using the default flexural hinge and shear hinge produces a remarkably low evaluation of the capacity of the structure, and causes an incorrect presumption of the structure failure modes. The user-defined hinge model can be used effectively and economically to guide seismic strengthening of existing reinforced concrete frame structures .
出处
《工程抗震与加固改造》
北大核心
2013年第3期113-120,共8页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金项目(51078037)
教育部高校博士点基金项目(20100205110010)
关键词
既有
钢筋混凝土
框架结构
自定义铰属性
抗震评估
existing
reinforced concrete
frame structure
user-defined hinge property
seismic evaluation
