共查询到19条相似文献，搜索用时 93 毫秒
1.
首先从竖向承载力角度,给出建筑结构地震倒塌破坏定义,并由此提出基于构件损伤指数的楼层损伤指数计算公式.然后在有关钢管混凝土构件低周疲劳试验基础上,对单步能量阈值与总滞回耗能线性组合的钢筋混凝土构件损伤准则进行修改,使之能够同时适用于钢筋混凝土构件与钢管混凝土构件地震损伤计算.算例表明,所建立的建筑结构地震损伤准则可靠、... 相似文献
2.
预制钢筋混凝土剪力墙结构抗震性能研究进展（Ⅱ）：结构性能研究 总被引：2，自引：0，他引：2
阐述了预制钢筋混凝土剪力墙结构抗震性能研究的重要性和预制钢筋混凝土剪力墙结构抗震性能研究的最新进展。综述了国内外预制钢筋混凝土剪力墙结构设计规范以及设计方法的研究进展。指出常规预制装配式钢筋混凝土剪力墙结构的抗震性能较差,在地震作用下,主要靠结构构件连接处的损伤和结构构件损坏来消耗能量;无粘结后张拉预应力预制混凝土剪力墙结构,在地震作用下具有自恢复中心能力和良好的抗震能力,但该结构体系的耗能能力不足。认为在预制钢筋混凝土剪力墙结构中设置耗能减震元件,或将预制钢筋混凝土剪力墙结构设计成隔震结构,将有效提高预制钢筋混凝土剪力墙结构的抗震性能。该类预制装配式剪力墙结构的抗震性能有待于进一步研究。 相似文献
3.
压弯构件在主余震作用下的累积损伤试验研究 总被引：1，自引：2，他引：1
本文对相似比为１：４的三组钢筋混凝土压弯构件模型先后进行了振动台主余震模拟试验和周期性震静力试验，通过试验研究了钢筋混凝土压弯构件在主余震作用下反应与损伤特性，并首次探讨了有损伤压弯构件恢复力模型的特点，在此基础上给出了建立前损伤压弯构件恢复力骨架曲线的一般方法，从而为结构在主余震作用下的随机地震反应分析和有损伤结构的抗震加固奠定了基础。 相似文献
4.
钢筋混凝土结构基于地震损伤性能的设计 总被引：58，自引：14，他引：44
本文结合我国地震设防水准,在国内外有关地震损在量研究结果的基础上,提出钢筋混凝土结构地震损伤的“三水准”性能目标;其次,对于剪切型钢筋混凝土结构,提出了结构层间柱－压弯构件三线性恢复力模型参数确定和地震损伤计算方法;第三,提出了地震损伤直接验算和将地震损伤验算归结为变形验算的钢筋混凝土结构地震损伤性能设计方法;最后,通过设计例题说明了本文方法应用的可行性。 相似文献
5.
基于可靠度的结构损伤性能设计 总被引：4，自引：0，他引：4
本文基于现行抗震规范设计方法，运用荷载抗力分项系数法对结构损伤可靠度进行了研究。选择了恰当的地震动随机过程模型。合理地确定了模型参数。利用现有的钢筋混凝土构件的损伤模型。应用响应面法拟合目标函数，提出了钢筋混弹簧土结构损伤可靠度的分项系数标定方法，根据试验经验公式并结合截面应力应变分析。确定了钢筋混凝土截面恢复力模型参数，应用MonteCarlo方法对结构的可靠度进行计算。编制了钢筋混凝土结构的损伤可靠度计算程序，采用重要抽样法计算结构的可靠度，提高了计算效率，计算了现行抗震规范的结构损伤可靠度，确定了分项系数和目标失效概率的关系。为现行规范向性能设计规范的过度提供了可靠度基础。 相似文献
6.
通过钢筋混凝土构件的动态试验,研究不同加载速率下的钢筋混凝土梁柱力学特性。考虑屈服强度、极限强度和刚度的动力效应,引入损伤因子,并考虑混凝土损伤对卸载刚度的影响,建立了钢筋混凝土构件率相关的三折线恢复力模型。利用有限元分析软件模拟钢筋混凝土构件的动态试验,对比模拟结果与试验结果得出：考虑应变率效应和混凝土损伤对卸载刚度的影响,能够更好地反映构件的动力特性。对一平面框架结构模型进行不同加载速率下的动态分析,研究加载速率对结构动力反应的影响,结果表明,随着加载速率的增大,结构模型各构件的强度和刚度增大,结构模型整体抗侧移刚度增强,水平位移减小。 相似文献
7.
《地震工程与工程振动》2021,41(5)
文中以新型预制装配+现浇钢筋混凝土箱型框架式地铁地下车站结构为研究对象,考虑预制构件与现浇构件的叠合作用与连接设计,建立了土-地连墙-地下结构非线性静动力耦合相互作用有限元模型,通过与传统现浇式车站结构的层间位移角、结构加速度和地震损伤的对比分析,探明了该部分预制装配式地铁地下车站结构的整体抗震性能水平。结果表明:由于预制装配式构件采用高标号混凝土,使得预制装配+现浇钢筋混凝土箱型框架式地铁地下车站结构的整体抗震性能明显优于对应的传统非装配现浇式车站结构;同时,输入具有明显低频振动特性的地震动时车站结构的地震反应最为强烈;预制+现浇叠合构件的横截面上,现浇部分混凝土的地震损伤明显大于同截面预制部分混凝土的地震损伤。 相似文献
8.
锈蚀钢筋混凝土压弯构件恢复力模型研究 总被引：3，自引：0，他引：3
根据目前已有试验资料和理论分析,结合钢筋锈蚀引起结构破坏形态的改变,综合考虑结构各种耐久性损伤因素,并对箍筋锈蚀进行修正,提出了锈蚀钢筋混凝土压弯构件基于地震损伤的恢复力模型的确定方法.通过与现有试验进行对比分析,表明模型描绘的骨架曲线与试验结果总体吻合较好,模型计算的滞回曲线所描述的现象与试验一致,该恢复力模型可在损伤钢筋混凝土结构地震反应分析中采用. 相似文献
9.
参数化的装配式钢混组合结构建筑信息模型缺少结构信息描述，无法实现装配式钢混组合结构图档的修正和自主更新，对结构构件的损伤评估效果差，抗震加固性能差。据此提出用于装配式钢混组合结构抗震加固的建筑信息模型，模型框架包括建筑设计模型、结构设计模型、结构抗震加固设计和损伤评估；通过结构构件的实体定义、属性定义和关联性定义，全面描述柱、梁、板和墙等钢混组合结构构件的抗震加固性能信息；采用模糊加固评估方法获取精准的结构构建综合损伤指数，评估结构构件的加固等级，提高抗震加固性能。经实验证明，所设计模型得到的结构损伤指数与实际损伤指数的误差低于0.03，说明该模型分析装配式钢混组合结构抗震加固性能准确性较高。 相似文献
10.
《地震工程与工程振动》2015,(3)
地震后迅速对震区的建筑结构进行准确的安全性鉴定至关重要。目前,我国地震现场建筑物损伤鉴定仍主要由专家依据经验给出判定结果。这样的方法难以避免由于鉴定者对结构震害现象的主观理解不同而导致的鉴定结果的差异,鉴定结论客观性不足。为解决这一问题,本文以钢筋混凝土框架结构为研究对象,提出一套基于损伤指数的结构震后安全性鉴定新方法。文中首先进行了一系列典型钢筋混凝土构件(8根柱试件、4根梁试件)的低周反复加载试验,记录下构件在每级控制位移下的损伤照片,并计算出相应的损伤指数,建立典型构件损伤指数和宏观损伤现象的对应关系,给出图例集;随后研究并筛选出合理的依据构件损伤指数计算整体结构损伤指数的方法;进而依据结构损伤指数给出损伤水平鉴定结果。最后,以一幢鲁甸地震中发生严重损伤的钢筋混凝土框架结构为例,采用本方法进行损伤鉴定,并与地震现场专家给出的鉴定结果相比较,验证了本方法的可行性。 相似文献
11.
改进的钢筋混凝土结构双参数地震破坏模型 总被引：34，自引：4，他引：34
本文在分析现有结构地震破坏模型的基础下，提出了一种改进掇参数地震破坏模型。文中采用三线退化型恢复力模型对实际钢筋混凝土结构在实际地震作用下的变形与累积耗能，极限变形与极限滞回耗能进行了分析，通过模型计算的破损结果与实际在结果的对比，研究了模型参数，从而建立了钢筋混凝土结构的双参数地震破坏模型。 相似文献
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The paper focusses on seismic damage analysis of reinforced concrete (R/C) members, accounting for shear–flexure interaction
in the inelastic range. A finite element of the beam-column type recently proposed by the writers for the seismic analysis
of R/C structures is first briefly described. The analytical model consists of two distributed flexibility sub-elements which
interact throughout the analysis to simulate inelastic flexural and shear response. The finite element accounts for shear
strength degradation with inelastic curvature demand, as well as coupling between inelastic flexural and shear deformations
after flexural yielding. Based on this model, a seismic damage index is proposed taking into account both inelastic flexural
and shear deformations, as well as their interaction. The finite element and the seismic damage index are used to analyse
the response of R/C columns tested under cyclic loading and failing either in shear or in flexure. It is shown that the analytical
model and damage index can predict and describe well the hysteretic response of R/C columns with different types of failure. 相似文献
13.
Recent studies reveal that R/C structural members subjected to biaxial flexure due to two-dimensional earthquake excitation can deform much more than would be predicted by conventional one-dimensional response analysis. The biaxial flexure may therefore have a significant effect on the dynamic collapse process of structures subjected to intense ground motions. The present paper is intended to develop a new formulation of the two-dimensional restoring force model of R/C columns acted upon by biaxial bending moments, and to discuss the dynamic response properties of R/C structures. The model considered is a two-dimensional extension of various non-linear models for one-dimensional response analysis, including the degrading trilinear stiffness model which is one of the simpler idealizations of the restoring force characteristics of flexural-failure-type R/C structures. The modelling validity is then examined by comparison with experimental data on the biaxial bending behaviour of R/C columns. Calculations are made to study the role of different system properties on the influence of inelastic biaxial bending on the dynamic structural response. It is shown that the inelastic biaxial effect is generally significant and, in some cases, critical in the case of R/C structures with stiffness-degrading properties, while the effect is not so important for the non-degrading inelastic cases. 相似文献
14.
采用耗能减震装置修复震后有损伤钢筋混凝土框架的试验研究 总被引：3，自引：1，他引：3
本文通过地震模拟振动台试验研究用耗能减震装置修复后震后有损伤钢筋混凝土框架的效果和可行性，文中制作了两层和三层两座钢筋混凝土剪切型框架，首先进行了地震损伤模拟试验，其次提出了震后有损伤结构的参数识别方法，修复准则和修复用耗能减震装置的设计准则；在此基础上，采用了软钢屈服型耗能器驿两座试验框架在地震损伤后进行修复，并再次对修复后的框架模型进行地震模拟试验，证实了采用这种修复措施可以恢复震后有损伤结构 相似文献
15.
A beam–column‐type finite element for seismic assessment of reinforced concrete (R/C) frame structures is presented. This finite element consists of two interacting, distributed flexibility sub‐elements representing inelastic flexural and shear response. Following this formulation, the proposed model is able to capture spread of flexural yielding, as well as spread of shear cracking, in R/C members. The model accounts for shear strength degradation with inelastic curvature demand, as well as coupling between inelastic flexural and shear deformations after flexural yielding, observed in many experimental studies. An empirical relationship is proposed for evaluating the average shear distortion of R/C columns at the onset of stirrup yielding. The proposed numerical model is validated against experimental results involving R/C columns subjected to cyclic loading. It is shown that the model can predict well the hysteretic response of R/C columns with different failure modes, i.e. flexure‐critical elements, elements failing in shear after flexural yielding, and shear‐critical R/C members. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
16.
The seismic vulnerability of old multi‐storey reinforced concrete (R.C.) buildings reinforced with substandard details is assessed as a function of interstorey drift demand imposed by the design earthquake while considering brittle termination of elastic response of the critical members of the structure due to a premature shear failure. Interstorey drift demand is related to column and wall translational stiffnesses which are expressed through analytical derivations in terms of the floor area ratios of gravity and lateral load bearing members in the critical floor. Interstorey drift capacity is related to the available transverse reinforcement and the axial load ratio of the vertical members. The significance of the area ratio of vertical members in the typical floor as an index of vulnerability is explored with reference to the limitations in the value of axial load ratio used in R.C. design in order to secure ductile flexural behavior, and also with reference to the stability index of gravity load bearing members. Interstorey Drift Spectra are derived for the existing R.C. buildings suitable for rapid seismic vulnerability screening but also as a guide for rehabilitation of the existing structures. Lightly reinforced or substandard reinforced concrete buildings that reportedly collapsed during previous earthquakes are used as example case studies in order to calibrate the proposed methodology. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
17.
抗震结构的等效延性破坏准则及其子结构试验验证 总被引：6，自引：0，他引：6
基于试验结果与分析，本文提出了反映结构低周疲劳特性的“等效延性破坏准则”。将由结构非线性动力反应分析求得的、预计按本文所提破坏准则能引起柱破坏的三种不同位移反应时程，施加于三个柱试件，以验证所提准则的有效性与实用性。 相似文献
18.
The seismic behavior of a school gymnasium, whose steel grid roof was heavily damaged during the Mw6.6 Lushan earthquake in 2013, is simulated through nonlinear dynamic analysis. The simulated damage is compared with field observations to validate the numerical model, based on which a parametric study was performed to provide insight into the failure process and damage patterns of steel grids. The results suggest that the grid damage is strongly related to roofsubstructure interactions. These include not only the substructure's amplification of the vibration, but the uncoordinated displacement of the substructure's columns which support the grid also play an equally important role. In particular, the latter effect may significantly alter the internal force distribution in the steel grid and lead to unexpected buckling of members that are proportioned as tension-only members. While such interactions are generally not accounted for in the design practice for grid structures in China, similar seismic damage may be expected for other existing grid roofs in future earthquakes. As is also demonstrated in this study, seismic isolation of the roof is a promising solution to protect grid roof structures by mitigating the detrimental effects of roof-substructure interactions. 相似文献