【作者】 王硕；

【导师】 纪晓东； 贺小岗；

【作者基本信息】 清华大学 ， 建筑与土木工程（专业学位）， 2017， 硕士

【摘要】 钢筋混凝土T形墙是高层建筑中常见的异形截面剪力墙。本文通过足尺试验和数值模拟,研究T形墙约束边缘构件长度和配箍率对墙肢承载力和抗震性能的影响,并提出关于T形墙约束边缘构件的设计方法和建议。通过3个T形截面RC剪力墙试件的拟静力试验,研究其在高轴压比下的抗震性能。试件分别按照《建筑抗震设计规范(GB 50011-2010)》、ACI 318-14规范和改进的设计方法设计,各试件的主要变化参数为腹板侧和翼缘侧的约束边缘构件长度与配箍率。试验结果表明:T形墙的破坏主要集中在腹板侧边缘,为核心混凝土压溃和竖向钢筋压屈,而翼缘破坏轻微,只是发生了混凝土开裂。三个试件尽管翼缘侧边缘构件设计不同,但在翼缘受压的方向表现出的受力行为一致,说明翼缘端的约束边缘构件可以削弱甚至不设计。在腹板受压的方向,按ACI 318-14设计的T形墙试件延性最好,墙体顶部位移角可达0.02 rad,说明在腹板自由端同时增加约束区长度和配箍可以改善T形墙的抗震性能;其他两个试件的变形能力和破坏状态几乎一致,分析说明在约束区配箍不变的前提下增加约束区长度,并不能显著改善墙体的抗震性能。通过截面分析软件X-tract和有限元软件Abaqus6.10建立T形墙模型,研究T形墙的抗震性能和承载力计算方法。X-tract的分析结果表明:采用平截面假定计算的峰值承载力与试验承载力相比基本相符;但是由试验量测的应变数据可知,在峰值承载力之后T形墙的截面应变分布不再符合平截面假定,因此采用X-tract很难准确模拟T形墙承载力的下降段。Abaqus的分析结果表明:采用有限元实体模型可以模拟T形墙的压弯性能,峰值承载力和破坏状态下腹板侧底部压应变的误差都在可接受范围内;由参数分析发现,在增加腹板侧约束边缘构件长度的同时,需相应提高约束边缘构件的配箍率,方能改善T形墙的受力性能。基于试验和数值模拟的结论,提出关于T形墙约束边缘构件的设计建议。更多还原

【Abstract】 T-shaped reinforced concrete(RC)wall are commonly used in high-rise buildings.Through full-scale experimental tests and numerical analysis,this thesis investigates the influence of length of special boundary elements and volumetric ratio of boundary transverse reinforcement on strength capacity and seismic behavior of T-shaped walls.Based on this study,the design methods recommendations are proposed for special boundary elements of T-shaped walls.Quasi-static tests were conducted on three specimens to examine the seismic behavior of T-shaped RC walls under high axial force ratio.Three different specimens were designed in accordance with GB 50011-2010,ACI 318-14 and an improved design methods,respectively.The major difference among those three specimens were length of special boundary elements and the volumetric ratio of boundary transverse reinforcement.The test results indicate that the damage to T-shaped walls is mainly concentrated in the web end,including the crushing of concrete and bulking of vertical reinforcement,while the flange was slightly damaged only with a few cracks.When the flange was in compression,three specimens showed nearly identical behavior,although they were designed with different boundary element at flange wall.It indicates that the special boundary element at the web-flange junction can be designed with lower requirement.When the web was in compression,the specimen designed per ACI 318-14 showed the largest ductility,with an ultimate drift of 0.02 rad.This indicates that increase of the length of special boundary element and the volumetric ratio of boundary transverse reinforcement leads to enhancement of seismic performance of T-shaped walls.The other specimens had the same deformation capacity and failure mode.The analysis indicates that the performance of T-shaped walls might not be improved by increasing the length of special boundary element only.Sectional analysis using X-tract programs and finite element analysis(FEA)using Abaqus 6.10 program were conducted to investigate the seismic behavior and the method to calculate the strength capacity of T-shaped walls.Sectional analysis results indicate that the flexural strength capacity calculated based on the assumption that plane section remain plane after bending generally agree with the test results.However,the X-tract analysis can not capture the post-peak behavior of the T-shaped walls,as the strain measurement for the specimens indicates that strain profile at the base section of the T-shaped wall does not satisfy this assumption any more in the post-peak loading phase.Finite element analysis results indicate that the Abaqus model using solid element can track the bending performance behavior of the T-shaped wall specimens.Both the maximum strength and the compressive strain at the base section of the web wall at the failure state correlate with the test results.Additional parametric analysis indicates that increase of both the length of special boundary element of web edge and the volumetric ratio of boundary transverse reinforcement is necessary for improvement of seismic performance of T-shaped walls.Based on the experimental tests and numerical analysis the design recommendations are proposed for special boundary elements for T-shaped RC walls.更多还原