钢管再生混凝土构件及其框架的抗震性能研究

发布时间：2018-05-29 14:37

本文选题：钢管再生混凝土 + 构件　；参考：《广西大学》2014年博士论文

【摘要】：钢管再生混凝土结构是钢管普通混凝土结构和再生混凝土结构相结合而产生的一种新型结构体系,它不仅继承了钢管普通混凝土结构的承载力高、抗震性能好等优点,而且有效地解决了建筑垃圾的资源化再利用问题。课题组已对钢管再生混凝土构件的基本受压性能进行了研究,在此基础上本文对钢管再生混凝土构件及其框架的抗震性能进行了深入、系统的研究。以再生粗骨料取代率、长细比、轴压比和含钢率为变化参数,进行了低周反复荷载作用下10个圆形和6个方形钢管再生混凝土柱试件的抗震试验。观察了试件受力的全过程和破坏形态,获取了滞回曲线、骨架曲线、延性、耗能、强度衰减和刚度退化等各项抗震性能指标。结果表明：试件的滞回曲线饱满；圆形试件的位移延性系数大于3,方形试件接近3；圆形试件破坏时位移转角介于1/28～1/17之间,方形试件介于1/21～1/17之间；破坏时圆形试件的等效粘滞阻尼系数介于0.305～0.460之间；方形试件介于0.323～0.360之间；基于抗震性能指标需求,再生混凝土用于钢管混凝土工程承重结构之中是可行的。以100%为再生粗骨料取代率,进行了低周反复荷载作用下一榀圆钢管再生混凝土柱-钢筋再生混凝土梁和一榀方钢管再生混凝土柱-钢筋再生混凝土梁框架试件的抗震试验。结果表明：框架在设计方法上满足了“强柱弱梁、强剪弱弯、强节点,弱构件”等抗震设计要求；框架滞回曲线对称,呈现出比较饱满的梭形；框架位移延性系数均大于3；圆形试件破坏位移转角为1/33,方形试件为1/24；破坏时圆形试件等效粘滞阻尼系数为0.243,方形试件为0.216。钢管再生混凝土柱-钢筋再生混凝土梁框架表现出了良好的抗震性能。根据等效塑性铰理论,计算得到的圆形钢管再生混凝土柱试件的塑性铰长度介于(0.45～0.95)h之间,方形试件介于(0.65～0.75)h之间；通过采用定点指向、位移幅值承载力突降、模型软化点等特殊处理方法,建立了低周反复荷载作用下钢管再生混凝土构件的三折线恢复力模型,较好地反映了构件荷载与位移的滞回关系；通过引入多种地震损伤评估模型,全方位的评价了钢管再生混凝土构件损伤发展过程和抗震能力。考虑了取代率影响因子,修正了现有的核心混凝土的受压本构关系,并采用有限元软件Abaqus对钢管再生混凝土构件进行抗震性能分析,计算得到的滞回曲线与实测结果吻合较好。在现有有限元模型的基础之上,进行了抗震性能拓展分析,得到了不同单参数变化试件的抗震性能指标,探讨了再生粗骨料取代率、含钢率、钢材牌号、轴压比、长细比以及截面高宽比对抗震性能指标的影响规律。根据实测滞回曲线、骨架曲线以及刚度退化规律,建立了低周反复荷载作用下钢管再生混凝土框架的三折线恢复力模型,较好地反映了框架荷载与位移的滞回关系；基于试验结果,探讨了单层单跨钢管再生混凝土框架的层间受剪承载力的设计计算方法；通过引入基于变形和累积耗能控制的双参数地震损伤模型,有效的评价了钢管再生混凝士框架损伤发展过程和抗震能力；基于性能设计,划分钢管再生混凝土结构的性能水准为正常使用、暂时使用、修复后使用、生命安全和防止倒塌五档,选用水平位移角和损伤变量作为量化指标,确定了基于一定保证率下的水平位移角和损伤指标限值,建立了在不同地震设防水准下不同性能水准所对应的性能目标。
[Abstract]:Steel tube recycled concrete structure is a new kind of structural system which is produced by the combination of ordinary concrete structure and recycled concrete structure . It not only inherits the advantages of high bearing capacity , good aseismatic performance and so on of ordinary concrete structure of steel pipe , but also effectively solves the problem of resource recycling of building garbage .

The anti - seismic tests of 10 circular and 6 square steel tube recycled concrete columns under low - cycle repeated loading are carried out with the substitution rate of recycled coarse aggregate , length - to - fine ratio , axial - pressure ratio and steel - containing rate . The whole process and failure mode of the stress of the test piece are observed , and the seismic performance indexes such as hysteretic curve , skeleton curve , ductility , energy consumption , strength attenuation and stiffness degradation are obtained .
the displacement ductility coefficient of the circular test piece is greater than 3 , and the square test piece is close to 3 ;
the displacement angle is between 1 / 28 and 1 / 17 when the circular test piece is damaged , and the square test piece is between 1 / 21 and 1 / 17 ;
The equivalent viscous damping coefficient of the circular test piece is between 0.305 and 0.460 .
the square test piece is between 0.323 and 0.360 ;
Based on the demand of anti - seismic performance index , recycled concrete is feasible in the bearing structure of steel tube concrete engineering .

An anti - seismic test of a circular steel tube recycled concrete column - reinforced concrete beam and a square steel tube recycled concrete beam frame test piece is carried out with 100 % as the replacement rate of the recycled coarse aggregate . The results show that the frame is designed to meet the seismic design requirements of " strong column weak beam , strong shear weak bending , strong node and weak component " .
The hysteresis curve of the frame is symmetrical , which shows a more full spindle shape .
the ductility coefficient of the frame is greater than 3 ;
the angle of failure displacement of the circular test piece is 1 / 33 , and the square test piece is 1 / 24 ;
The equivalent viscous damping coefficient of circular test piece is 0.243 , and the square test piece is 0.216 . The steel tube recycled concrete column - reinforced concrete beam frame shows good seismic behavior .

According to the theory of equivalent plastic hinge , the plastic hinge length of the obtained circular steel tube recycled concrete column is between ( 0.45 ~ 0.95 ) h , and the square test piece is between ( 0.65 ~ 0.75 ) h ;
By using the special treatment methods such as pointing , displacement amplitude bearing capacity and model softening point , the three - fold line restoring force model of steel tube recycled concrete member under low - cycle repeated loading is established , which can reflect the hysteretic relationship between component load and displacement .
By introducing a variety of seismic damage assessment models , the damage development process and seismic capacity of steel tube recycled concrete members were evaluated in all directions .

In this paper , the influence factors of substitution rate are taken into consideration , the compression constitutive relation of the existing core concrete is corrected , and the seismic performance analysis of the steel tube recycled concrete member is carried out by using the finite element software Abaqus . The seismic performance expansion analysis is carried out on the basis of the existing finite element model .

According to the measured hysteretic curve , the skeleton curve and the rule of stiffness degradation , a three - fold restoring force model of the steel tube regeneration concrete frame under the action of low - cycle repeated loading is established , and the hysteretic relationship of the frame load and displacement is well reflected ;
Based on the experimental results , the design and calculation method of shear bearing capacity of single - layer single - span steel tube recycled concrete frame is discussed .
By introducing the two - parameter seismic damage model based on deformation and cumulative energy consumption control , the damage development process and seismic capacity of the concrete filled steel tube regeneration concrete frame are effectively evaluated .
Based on the performance design , the performance level of the steel tube recycled concrete structure is divided into normal use , temporary use , post - repair use , life safety and prevention of collapse , the horizontal displacement angle and the damage variable are selected as the quantitative indexes , and the performance targets corresponding to different performance levels at different seismic fortification levels are established .
【学位授予单位】：广西大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU398.9;TU352.11

【参考文献】