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百米级配筋砌块砌体剪力墙结构抗震性能研究与动力测试

发布时间:2019-03-15 19:46  文章来源:笔耕文化传播
【摘要】:随着现代建筑技术的快速发展,新型建筑结构体系纷纷涌现。配筋砌块砌体剪力墙结构体系,具有强度高、延性好、耗能能力强等与钢筋混凝土结构相近的特性,又有工期短、用钢量少、节省模板、减少墙面抹灰、增加使用面积等优点,符合我国倡导的节约型社会发展要求,因此该结构体系的应用前景非常广泛。目前,针对百米级配筋砌块砌体剪力墙结构抗震性能的试验研究和数值分析较少,环境激励下的振动测试试验还未见报道,其中的一些科学与技术问题亟需解决。揭示此类结构的动力特性和工作行为特征,对该体系的发展具有重要的理论意义和工程应用价值。基于上述原因,论文对拟建的百米级配筋砌块砌体剪力墙结构办公楼示范工程,进行了抗震性能试验研究和弹塑性数值模拟分析,并在建设过程中对不同高度的结构进行了环境激励下的动力性能测试,主要研究工作如下:(1)针对拟建百米级配筋砌块砌体剪力墙高层建筑的特点和力学特性,设计并制作了一个1/4比例10层的配筋砌块砌体剪力墙模型结构,进行了地震模拟振动台试验研究,探索大开间、大洞口、弱连梁、长周期高层结构的破坏模式和动力响应规律,为分析百米级配筋砌块砌体剪力墙结构的地震反应提供试验基础。探讨了模型结构的破坏模式、损伤状态及动力响应规律。从结构的破坏过程可以看出,连梁端部首先出现裂缝,随着地震动强度的增大,墙肢逐渐出现沿灰缝的水平裂缝,模型整体呈弯剪破坏模式,实现了强肢弱梁的多道抗震设防目标。在8度罕遇地震作用下,结构处于中等破坏状态。试验研究表明,配筋砌块砌体剪力墙结构具有较好的抗震能力和较强的变形能力。(2)揭示了配筋砌块砌体剪力墙抗震机理,为进行百米高层结构的数值分析提供理论基础。收集并整理了已完成的配筋砌块砌体剪力墙拟静力试验数据,探讨了各参数对墙体骨架曲线形状的影响,建立了刚度衰减方程,对比服从两种不同概率分布的刚度损伤因子,并分析了刚度退化系数与位移角之间的关系。回归了标准化耗散能与位移之间关系,探讨了等效粘滞阻尼比和功比指数的变化规律,给出墙体能量耗散系数和等效粘滞阻尼比的范围。提出了适用于配筋砌块砌体剪力墙的荷载-位移恢复力模型,能够较好的模拟此种墙体滞回曲线严重的“捏拢”现象。(3)为实现在六度抗震设防区建设百米高层配筋砌块砌体剪力墙结构办公建筑,进行了以下研究:基于ABAQUS有限元软件中的INP建模方法,对试验模型结构进行有限元模拟,灌芯砌体采用混凝土塑性损伤模型(简称CDP模型),将本文提出的刚度损伤因子带入灌芯砌体受压本构模型。计算模型结构的频率、振型、加速度和位移时程曲线,数值计算结果与实测结果吻合较好,验证了有限元建模方法的正确性和所选材料本构模型的准确性。参照试验模型结构的建模方法和材料模型,对百米高层结构进行了地震反应分析,考察整体结构的破坏模式和动力响应。研究表明,百米高层结构的侧向刚度、扭转比和剪重比均满足规范要求,结构弱轴方向连梁首先破坏,然后与之相邻的窗下墙和窗侧墙破坏,随着地震动强度的增大,各层墙肢从下到上逐渐破坏,实现了多道抗震设防目标。在8度罕遇地震作用下,各层的层间位移角均满足规范要求,可见此百米高层结构具有较好的抗震性能。(4)在百米高层建设阶段,分别对完成建设的10层、18层和28层主体结构进行了环境激励下的振动测试试验,并利用测试结果对有限元模型进行验证。采用基于频域的峰值拾取法和基于时域的随机子空间法,对整体结构进行了模态参数识别,得到了固有频率和振型的变化规律。利用数值模拟方法,分别计算了结构不同高度时的频率和振型,计算结果与实测结果吻合较好,验证了有限元建模方法的正确性和材料力学参数的准确性。综合上述研究成果可以得出,在地震区采用配筋砌块砌体剪力墙结构体系建设百米级高层建筑是可行的,完成的百米高层办公楼示范工程建设,突破了我国规范中关于该结构体系应用高度的限值,为该体系向高层、超高层发展奠定了基础和技术支撑,所得成果可为编制标准提供科学依据。
[Abstract]:With the rapid development of modern construction technology, the new building structure system has been emerging. the reinforced block masonry shear wall structure system has the advantages of high strength, good ductility, strong energy dissipation capacity and the like, The application prospect of the structure system is very wide, which is in accordance with the development requirements of the resource-saving society advocated by our country. At present, the experimental research and numerical analysis of the seismic performance of a 100-meter-grade reinforced block masonry shear wall structure are less, and the vibration test test under the environment excitation is not reported. Some of the scientific and technical problems need to be solved urgently. The dynamic characteristics and working behavior characteristics of such structures are revealed, and the development of the system is of great theoretical significance and engineering application value. Based on the above reasons, the paper has carried out the seismic performance test research and the elastic-plastic numerical simulation analysis for the proposed 100-meter-grade reinforced block masonry shear wall structural office building, and conducted the dynamic performance test under the environmental excitation for the structure of different heights in the construction process, The main research work is as follows: (1) According to the characteristics and mechanical characteristics of the proposed 100-meter-grade reinforced block masonry shear wall high-rise building, a 1/4-scale 10-layer reinforced block masonry shear wall model structure is designed and manufactured, The failure mode and dynamic response of the large-hole, weak-link beam and long-period high-rise structure are analyzed, and the experimental basis is provided for analyzing the seismic response of the multi-meter-level reinforced block masonry shear wall structure. The failure mode, damage state and dynamic response of the model are discussed. As can be seen from the process of the failure of the structure, the crack at the end of the connecting beam, with the increase of the ground vibration strength, the wall limb gradually appears along the horizontal crack of the grey joint, the whole of the model is in the bending-shear failure mode, and the multi-track anti-seismic fortification target of the strong-limb weak beam is realized. Under the action of 8-degree rare earthquake, the structure is in a medium-destructive state. The test results show that the reinforced block masonry shear wall structure has good anti-seismic ability and strong deformation capability. (2) The anti-seismic mechanism of the reinforced block masonry shear wall is revealed, and the theoretical basis is provided for the numerical analysis of the high-level structure. The static test data of the finished reinforced block masonry shear wall are collected and sorted, the influence of each parameter on the shape of the wall skeleton curve is discussed, the stiffness decay equation is established, and the stiffness damage factors which are subject to two different probability distributions are compared, The relationship between the stiffness degradation coefficient and the displacement angle is also analyzed. The relationship between the normalized dissipation energy and the displacement is regressed, the variation law of the equivalent viscous damping ratio and the power ratio index is discussed, and the range of the energy dissipation coefficient and the equivalent viscous damping ratio of the wall body is given. The load-displacement restoring force model for the reinforced block masonry shear wall is put forward, which can simulate the serious "knead" phenomenon of the hysteretic curve of the wall. (3) In order to realize the construction of a 100-meter high-rise building block masonry shear wall structure in the six-degree anti-seismic fortification region, the following research is carried out: based on the INP modeling method in the ABAQUS finite element software, the finite element simulation of the test model structure is carried out, In this paper, the concrete plastic damage model (CDP) is used in the core-filled masonry, and the stiffness damage factors presented in this paper are brought into the pressure constitutive model of the core-filled masonry. The frequency, the mode shape, the acceleration and the displacement time history curve of the model structure are calculated, and the numerical results are in good agreement with the measured results, and the correctness of the finite element modeling method and the accuracy of the selected material constitutive model are verified. With reference to the modeling method and material model of the test model structure, the seismic response analysis of the 100-meter high-level structure is carried out, and the failure mode and the dynamic response of the whole structure are investigated. The research shows that the lateral stiffness, the torsion ratio and the shear-weight ratio of the 100-meter high-rise structure meet the requirements of the specification, the structural weak-axis direction connecting beam is first broken, and then the adjacent window lower wall and the window-side wall are damaged, and the wall limbs of each layer are gradually damaged from the bottom to the bottom with the increase of the ground vibration intensity, And the multi-track anti-seismic fortification target is realized. Under the action of 8-degree rare earthquake, the inter-layer displacement angle of each layer meets the requirements of the specification, and it can be seen that the high-rise structure of the 100-meter has better anti-seismic performance. (4) At the construction stage of the 100-meter high-rise building, the vibration test is carried out on the 10,18 and 28-layer main structures, and the finite element model is validated by the test results. Based on the frequency-domain-based peak-pick-up method and the time-domain-based random subspace method, the modal parameter identification of the whole structure is carried out, and the law of the natural frequency and the vibration mode is obtained. The frequency and mode shapes at different heights of the structure are respectively calculated by means of the numerical simulation method. The results of the calculation are in good agreement with the measured results, and the correctness of the finite element modeling method and the accuracy of the material mechanics parameters are verified. Based on the above research results, it can be concluded that the construction of a 100-meter high-rise building with the reinforced block masonry shear wall structure system in the seismic region is feasible, and the completed 100-meter high-rise office building demonstration project construction has broken through the limit value of the application height of the structural system in our country's specifications, The system provides the foundation and technical support for the high-rise and super-high-rise development of the system, and the result can provide the scientific basis for the preparation of the standard.
【学位授予单位】:哈尔滨工业大学
【学位级别】:博士
【学位授予年份】:2015
【分类号】:TU364;TU352.11


本文编号:2440929


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