【作者】 田洁；

【导师】 姚谦峰；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2007， 博士

【摘要】 密肋壁板结构是一种节能抗震的新型结构体系,有着很好的应用前景。目前,在多层及高层房屋建筑中的理论与应用研究已取得了重要的阶段性成果,但在底部大空间房屋建筑中的应用研究还较为薄弱。特别是框支密肋壁板结构属于带转换层的结构,存在转换层上下承载力和刚度的匹配问题,对其抗震性能及抗震设计理论与方法的研究显得尤为重要。本文以框支密肋壁板结构为主要研究对象,引入基于性能的抗震设计思想,围绕着结构的非线性地震反应分析和结构基于地震损伤性能的抗震能力评估两个方面开展了研究工作。着重对框支密肋壁板整体结构在水平地震作用下的非线性行为,破坏形态、滞回性能、耗能能力及损伤性能等进行了较为深入细致的研究;对框支密肋壁板结构基于性能的抗震设计做一些初步的和基础性的工作,主要研究内容如下:1.针对课题组前期三榀1/2比例两层两跨和一榀1/3比例三层两跨框支密肋壁板结构模型的拟静力试验,研究分析了框支密肋壁板结构在竖向和水平荷载共同作用下的破坏过程、破坏形态、承载能力、刚度退化、变形性能、滞回延性、抗倒塌能力等抗震性能。利用拟静力反复加载试验结果的滞回关系,以IDARC程序仿真其力-位移模型来取得适当的滞回规则参数,为建立地震作用下的非线性计算模型提供依据。2.对框支密肋壁板结构进行了水平地震作用下的非线性动力分析。针对不同的分析内容和目的,提出了不同的计算分析模型,并利用试验数据对计算模型的合理性和精确度进行了验证。在非线性动力分析中,对框支密肋壁板结构整体及构件的动力特性、地震响应、整体屈服机制等进行了深入细致的分析,得到了一些规律性的认识。探讨了转换层上、下刚度比对框支密肋壁板结构抗震性能的影响,提出了框支密肋壁板结构转换层上下刚度比的合理取值及底层抗震墙数量的确定方法,为工程设计提供参考。3.对美国规范ATC-40能力谱方法和K.Chopra提出的改进能力谱方法进行了评析。并将Chopra改进能力谱方法应用于框支密肋壁板结构的抗震性能评估中,通过实例分析,结合我国规范给出了具体的实施步骤和过程。同时,采用四种侧向力分布模式对试验模型和实例进行了Push-over分析,并与试验及动力分析结果进行了比较,探讨了侧向力分布模式对框支密肋壁板结构的适应性。4.根据课题组前期15榀1/2比例密肋复合墙体在单调及低周反复荷载作用下的试验结果,对复合墙体的破坏形态、滞回性能、耗能能力和累积损伤模型等进行了分析,探讨了墙体累积损伤的发展过程和发育规律,提出了阶段损伤指数的概念,并通过损伤模型计算的破损结果与试件实际破坏特征对比,确定了墙体的阶段损伤界限值,可供工程实际抗震设计和评估参考。5.在框支密肋壁板结构试验和数值计算分析的基础上,研究了结构地震能量反应及地震滞回耗能特性,并在构件层次上探讨了总滞回耗能在结构内部的分布规律;根据框支密肋壁板结构的破坏过程和破坏特征,选取变形和能量双重破坏准则,采用基于疲劳的损伤模型,分别对算例和实例进行了地震作用下的损伤分析;结合国内外相关研究成果和数值计算结果,探讨了框支密肋壁板结构地震损伤性能水准的确定和性能目标的量化问题,提出了框支密肋壁板结构基于损伤性能的目标量化参数,可供工程实用参考。6.以总体破坏指标损伤指数作为性能参数建立框支密肋壁板结构损伤可靠度分析的极限状态方程。根据框支密肋壁板结构和复合墙体模型试验结果来确定允许(抗力)极限损伤指数,通过对允许极限损伤指数的概率统计分析,得到了允许极限损伤指数概率统计分布和统计参数,为这类结构和墙体的可靠度分析提供了基础:并根据以往的研究成果,探讨了地震作用损伤指数(效应)的概率统计特性,从而提出了框支密肋壁板结构地震损伤可靠度近似分析方法。本文的创新之处在于:1.建立了框支密肋壁板结构非线性动力分析模型并进行了数值分析理论研究结合课题组前期试验结果,以IDARC程序仿真其力-位移模型获取了结构的滞回规则参数。针对不同的分析目的和内容,提出了可考虑刚度退化、承载力衰减及捏缩效应的刚架-斜压杆宏观模型和简化分析模型,建立了框支密肋壁板结构的非线性动力计算模型,首次对该类结构进行了非线性动力时程分析。探讨了转换层上、下刚度比对框支密肋壁板结构抗震性能的影响,提出了框支密肋壁板结构转换层上下刚度比的合理取值及底层抗震墙数量的确定方法。2.探讨了框支密肋壁板结构非线性地震反应分析的简化方法探讨了Push-over分析的侧向力分布模式对框支密肋壁板结构的适应性问题;首次将Chopra改进能力谱方法应用于框支密肋壁板结构的抗震性能评估中,并通过实例分析,结合我国规范给出了具体的实施步骤和过程。3.提出了框支密肋壁板结构和密肋复合墙体的损伤性能目标量化参数根据框支密肋壁板结构主要承力构件(密肋复合墙体)的试验结果,探讨了墙体累积损伤的发展过程和发育规律,提出了密肋复合墙体的阶段损伤界限值;根据试验和数值计算结果,确定了框支密肋壁板结构地震损伤性能水准,并提出了性能目标的量化参数。4.研究了框支密肋壁板结构和密肋复合墙体的地震损伤极限概率统计特性依据框支密肋壁板结构和复合墙体模型试验数据,研究了框支密肋壁板结构及其主要承力构件(密肋复合墙体)的允许极限损伤指数的概率统计特性,得到了允许极限损伤指数的概率统计分布和统计参数;以总体破坏指标损伤指数作为性能参数建立了极限状态方程,给出了框支密肋壁板结构地震损伤可靠度近似分析方法。更多还原

【Abstract】 Multi-ribbed slab structure(MRSS)is a new structural system with characteristic of saving energy and seismic performance,which have good forward-looking application.At the present time, the significant staged achievements have been made in the study of the theoretical and application of multi-storied and high-rise buildings,while the study of this system in buildings with large space at the bottom still remains weakness.Specially there is a matching problem of bearing capacity and stiffness in the transform storey of frame-supported multi-ribbed slab structure(FSMRSS).So it is highly important for study of seismic performance as well as theoretics and methods of seismic design.The dissertation is devoted to FSMRSS,and studies in the two aspects of the nonlinear earthquake response analysis of FSMRSS and damage performance based seismic evaluation methods have been developed by introducing performance based seismic design thought,which mainly studies its nonlinear performance under horizontal earthquake including the failure mode,hysteretic characteristic, energy dissipation and damage formulas.Some fundamental works have been done for performance based seismic design of FSMRSS.The main studied are as follows:1.This paper presents the results and discussions of experimental study on FSMRSS specimen. The specimen is four scaled models(three 1/2 scale two-storey two-bay models and one 1/3 scale three-storey two-bay model)of FSMRSS.The pseudo-static experiments of the specimens have been executed.The seismic performances under low cyclic loadings,such as the failure procedure,failure mode,beating capacity,deformation features,stiffness,hysteretic characteristic and anti-collapse performance,are studied.The hysteretic parameters of the specimen are obtained by use of hysteretic loops of the test under low cyclic loadings through simulation of force-displacement relations with inelastic analysis program IDARC.The hysteretic parameters obtained can reflect stiffness and strength degradation and slip pinching of the specimen,which provide importent foundation for establishment of the nonlinear analysis model of FSMRSS under earthquakes.2.The nonlinear dynamic time-history analysises of FSMRSS under horizontal earthquakes have been carried out.Aimed at different analysis contents and purpose,different calculating models are proposed,the rationality and accuracy of numerical model are validated through comparing with the test results.The the results of dynamic analyses show good coincidence with the experimental results which also show that proposed model is feasible.The dynamic response and yield mechanism of FSMRSS etc.are carefully studied,which provides more data information for the comprehension of earthquake responses of the structures.The influence of stiffiaess ratio of transform storey on seismic performance of FSMRSS are discussed.A rational value of stiffness ratio of transform storey and amounts of seismic wall at bottom are obtained,which are provided for reference of engineering design.3.The ATC-40 procedure,the improved capacity spectrum method proposed by Chopin and their comparisons are introduced.Chopra improved capacity spectrum method is used into aseismic capability assessment of FSMRSS which the process are present according to China Code by analysis of an example of building.In the meanwhile,Push-over analysis of the test models and the example have been carried out by four kinds of the later load patterns,and also compared with test and dynamic results,which adantability of later load pattems to FSMRSS are studied.4.Based on test results of 15 half-scale multi-ribbed slab wails under monotonic horizontal and low reversed cyclic loading,fsilure pattern,hysteresis behavior,energy dissipation and seismic damage models are analyzed.The conception of phase damage indexes is put forward throuth investigating developments of cumulative damage.By comparing the calculated damage indexes with the observed real damage of the multi-ribbed slab walls,the confine value of phase damage index of the wall is presented.5.Considering fatigue based damage model,hysteretic energy dissipation and damage performance of the test model structures and numerical cases and an example of building of FSMRSS under horizontal earthquakes are sepamtly analyzed.The damage feature and damage time-history response of rib beam and rib column elements and storeies and overall structures under different intensity earthquakes are discussed.Firstly in the level of element the energy dissipation and damage formulas of FSMRSS under horizontal earthquakes are analyzed,witch is important for exploring week parts or storeies of the structure.The establishment of performance levels and quantitative analysis of seismic performance targets,of FSMRSS are discussed,which quantified target parameters based on damage performance are put forward to supply references to seismic evaluation of FSMRSS. 6.Limit state equations of damage reliability analysis of FSMRSS as well as the multi-ribbed panel wall are built in terms of the whole damage indexes(as behavioural parameters)of FSMRSS and the multi-ribbed panel wall.Limit damage indexes are calculated based on test results of FSMRSS and multi-ribbed panel wall models.Through probability and statistical analysis of limit damage indexes,the probability distributions and statistical parameters have been obtained for different probabilistic models,which is necessary for reliability analysis of the FSMRSS and multi-ribbed panel wall based on damage performance.At the same time,probability and statistical characteristic of damage indexes under earthquakes are also are discussed.So an approximate seismic reliability analysis method based on damage performance is provided for the FSMRSS and multi-ribbed panel wall.The originality of this dissertation lies in:1.Establishment of nonlinear dynamic model of FSMRSS and numerical analysis of structureThe hysteretie parameters of the specimen are obtained by use of hysteretic loops of the test under low cyclic loadings through simulation of force-displacement relations with inelastic analysis program IDARC.Aimed at different analysis contents and purpose,a rigid flame-oblique compression bar model and simplify model using degrading control parameters for stiffness and strength degradation and slip pinching.are proposed,which nonlinear dynarnie calculating model of FSMRSS are established.The nonlinear dynamic time-history analysises of FSMRSS under horizontal earthquakes have been first carried out.A rational value of stiffness ratio of transform storey and amounts of seismic wall at bottom are obtained.2.The simplify analysis method of nonlinear earthquake responses of FSMRSS is discussedThe adaptability of later load patterns to FSMRSS in push-over analysis are studied.Chopra improved capacity spectrum method is used into aseismic capability assessment of FSMRSS which the process are present according to China Code by analysis of an example of building.3.The quantified target parameters based on damage performance of FSMRSS and multi-ribbed slab walls are put forwardBased on test results of multi-ribbed slab walls,the conception of phase damage indexes is put forward throuth investigating developments of cumulative damage.According to test and numerical analysis the seismic damage performance levels of FSMRSS are established,which quantified target parameters based on damage performance are put forward.4.The probability and statistical characteristic of limit seismic damage indexes of FSMRSS and multi-ribbed slab walls are analysed.Based on test results of FSMRSS and multi-ribbed panel walls,the probability and statistical characteristic of permitting limit damage indexes are analysed,the probability distributions and statistical parameters have been obtained for different probabilistic models.Limit state equations of damage reliability analysis of FSMRSS as well as the multi-ribbed panel wall are built in terms of the whole damage indexes(as behavioural parameters)of FSMRSS and the multi-ribbed panel wall.So an approximate seismic reliability analysis method based on damage performance is provided for the FSMRSS and multi-ribbed panel wall.更多还原