【作者】 秦雪映；

【导师】 王秀丽；

【作者基本信息】 兰州理工大学 ， 结构工程， 2006， 硕士

【摘要】 近年来发生的一系列大震表明,对建筑结构进行大震作用下的弹塑性分析是十分必要的。虽然弹塑性时程分析法被认为是进行结构弹塑性动力分析最可靠的方法,但由于计算复杂、可操作性茶等原因而未能被广泛用于实践。故此,一些国家的学者相继提出用Push-over分析法进行结构抗震能力的检验。 目前,弹塑性分析已经成为结构抗震设计的一个重要组成部分,已经被我国列入《建筑抗震设计规范》作为结构弹塑性变形分析方法之一。 木文论述了静力弹塑性分析Push-over方法的发展及现状,对Push-over分析方法的理论基础和如何进行结构抗震评估做了介绍,并用此方法对三种不同的多层钢框架体系(纯钢框架结构、中心支撑钢框架结构、交错桁架结构)进行了对比分析,由ETABS有限元分析软件予以实现。 研究的内容包括由Push-over分析方法得到的结构底部剪力—顶点位移关系非线性曲线、结构破坏时的层间位移角分布以及结构变形曲线、结构构件塑性铰的出现顺序以及分布情况、结构反应评估及可能的破坏机制等。此外还对影响弹塑性静力分析结果的其它因素如侧向力加载方式等进行了说明,且给这三种结构的抗震性能做了结论:得出中心支撑钢框架结构具有较好的刚度、延性及承载力,但耗能性能明显低于纯钢框架和交错桁架,交错桁架结构具有良好的恢复力特性;得到了这三种结构的破坏模式规律,塑性铰首先出在结构底层的中间,然后向四周发展等。更多还原

【Abstract】 Series of seismic destructions occurred in recent years have shown that it is necessary to perform elastoplasticity analysis for structures under strong earthquake. The method of elastoplasticity time-history analysis is regarded as a most reliable method for structural elastoplasticity analysis, but as a result of complicated calculation and poor availability, the method is not widely used. According to this, some researchers propose the method of Push-over to check the seismic ability of structure.At present, Push-over analysis has become an important part of structural seismic design, and has been concluded as one of the analysis methods for structural elastoplastic deformation in Chinese seismic design code.The developing procedure and status quo of static elastoplasticity push-over analysis is presented in this paper. Theoretic basis of Push-over method and the process to evaluate structural seismic performance is also introduced. Employing finite element analysis program of ETABS, seismic performance of three different kinds of multi-storey steel frame system (steel frame system, concentrically braced steel frame system and staggered truss system) is discussed with a comparative analysis.The curve of structural between base shear and top displacement, the location of drift angle and structural deformation curve when structural rupture occurs, appearance order and location situation of plastic hinge, the evaluation of structural response and possible failure mechanism are all listed in this paper. In addition, some other effects on the analysis results as lateral loading patterns et al. are presented. Thus the following conclusions can be obtained as: under comparison of steel frame system and staggered truss system, concentrically braced steel frame system possesses better performance of stiffness, ductility, bearing capacity in spite of dissipation ability;staggered truss system is provided with excellent restoring characteristic;plastic hinge occurs in middle part of the second floor primarily and then expends around, which works as the common failure principle of the three systems.更多还原