【作者】 朱爱萍；

【导师】 肖从真；

【作者基本信息】 中国建筑科学研究院 ， 结构工程， 2015， 博士

【摘要】 近年来,我国高层建筑发展迅速,各种高层、超高层建筑不断涌现。内置钢板-混凝土组合剪力墙因其具有承载力高、延性好、耗能能力强等优点,满足高层建筑对结构构件强度、刚度等性能的高要求。高强混凝土的采用具有节材、可有效减小结构构件的截面尺寸,增加建筑的使用空间等优点,将成为高层建筑领域的优选材料。将高强混凝土应用于内置钢板-混凝土组合剪力墙,能够充分发挥钢、混凝土组合的优势,可提高剪力墙的承载力、减小剪力墙截面面积并具有较大的抗侧刚度,提高建筑结构综合抗震性能,具有广泛的应用前景。但因缺乏高强混凝土应用于内置钢板-混凝土组合剪力墙的研究成果和工程实践经验,使得对高强混凝土的认识和理解不同,限制了高强混凝土的应用。本文采用试验研究与理论分析相结合的方法,对配置混凝土强度等级为C80的内置钢板-混凝土组合剪力墙试件在往复荷载作用下的滞回性能进行分析,研究其承载能力、刚度、延性、耗能能力和破坏特征。根据试验研究及分析结果,提出内置钢板-混凝土组合剪力墙设计建议。论文具体完成了以下内容:(1)共完成了30个剪力墙试件试验研究,其中包括20个剪跨比为1的试件和10个剪跨比为2的试件。系统分析了轴压比、墙身钢板含钢率、墙身分布钢筋配筋率及间距等对试件的承载力、刚度、变形能力、滞回耗能能力及破坏特征的影响。研究结果表明:内置钢板能有效提高剪力墙的抗侧刚度、承载力和耗能能力;内置钢板-剪力墙的设计轴压比限值可取为0.50;在保证一定构造措施下,C80高强混凝土在试件中能够充分发挥其强度,并不影响试件所需的变形能力。(2)采用基于修正斜压场理论的VT2程序进行内置钢板-混凝土组合剪力墙的非线性有限元分析,从应力-应变层次出发,对这种试件在模拟地震作用的低周反复加载试验条件下的受力机制和受力全过程进行了更为深入的模拟分析,并与试验结果进行对比。从每个试件的对比结果看,VT2计算得到的荷载-位移曲线与试验滞回曲线吻合度较高,钢筋混凝土有限元单元受压及受拉破坏位置、形态、裂缝走向均与试验结果近似,具有较高的准确性。(3)通过分析内置钢板对剪力墙受剪承载能力的贡献,在现行规范已有公式的基础上修正型钢及钢板项系数,给出内置钢板-组合剪力墙受剪承载力计算公式,该公式能够更好的反应墙体钢板含钢率对承载力的影响。通过试验数据分析,确定平截面假定仍适用于配置C80高强混凝土的内置钢板-混凝土组合剪力墙受弯承载力计算。更多还原

【Abstract】 Recently, high-rise buildings are developing very rapidly in China. A variety of high-rise and super high-rise buildings continually spring up. Due to the advantages of higher load carrying capacity, better ductility and energy dissipation capacity, Embedded Steel Plate Reinforced Concrete Composite Shear Walls(ESPRCCSW) meet the higher requirement of such high-rise buildings both in terms of strength and stiffness as structural members. At the same time, employment of high strength concrete can bring about the benefits such as saving materials, reducing section size of structural members and increasing architectural space, therefore it is becoming an optimal material in the field of high-rise buildings. By integrating high strength concrete into ESPRCCSW,the advantages of both steel and high strength concrete can be effectively taken of to increase the load carrying capacity and lateral stiffness, while section size of shear walls can be effectively reduced, and the overall seismic performance of buildings can be enhanced. However, due to lack of research findings and engineering practice, the application of high strength concrete ESPRCCSW is very limitedBy experimental study and theoretical analysis, this thesis investigated the seismic performance of ESPRCCSW members with concrete grade of C80 under reversed cyclic loading. The objectives of the thesis were to examine the load carrying capacity, stiffness, ductility, energy dissipation capapcity and failure mechnism of high strength concrete ESPRCCSW. On the basis of experimental and analytical results, design provisions were proposed for ESPRCCSW. The thesis had specifically accomplished the following contents:(1)A total of 30 ESPRCCSW specimens had been tested,in which 20 have the shear span ratio of 1,and the rest 10 have the shear span ratio of 2 respectively. Systematic analysis had been carried out on the influence of axial compression ratio, steel plate ratio, rebar spacing and reinforcement ratio on the load carrying capacity, stiffness, deformation capacity, energy dissipation capacity and failure mechanisms of the members. The research findings revealed that steel plates can effectively increase the load carrying capacity, lateral stiffness and energy dissipation capacity of ESPRCCSW; the design axial compression ratio limit for ESPRCCSW may be taken as 0.50; high strength concrete of C80 can be used in ESPRCCSW members without influencing the required deformation capacity, if certain detailing measures are ensured,.(2)Nonlinear finite element analysis had been performed for ESPRCCSW by VT2 program based on the modified compression field theory, on the level of stress-strain relationships of materials to unveil the damage process and failure mechanism of ESPRCCSW under reversed cyclic loading conditions to simulate the earthquake action. The numerical results were compared with the experimental results. From the comparison it is found that the FE simulation has relatively high accuracy. The load-displacement curves obtained by VT2 simulation agree well with the recorded measured curves; failure positions and patterns under compression/tension and crack propagation of the FE model are also similar to the experimental results.(3)By analyzing the contribution of steel plates to the ultimate shear carried by the shear wall, and by revising the coefficients for steel profiles and steel plates in the existing equation in the current code of practice, a new calculation equation was proposed for the ultimate shear design of ESPRCCSW. The equation can better reflect the effect of steel plate ratio on the ultimate shear of the shear wall. By analyzing experimental data,it was found that the assumption of plain sections remain plain is applicable to ESPRCCSW with high strength concrete of C80.更多还原