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1、哈尔滨工业大学工学硕士学位论文 - II - 构整体 抗震性能 较 差 ； (4) 填充墙的存在使结构所能抵抗 的 最大地震动加速度 峰 值降低 ，削弱 了 结构的抗震能力 ，更易形成“强梁弱柱”的破坏机制 ； (5) 碳纤维 加固全填 充框架 结构 的 合理 方法是 加固首层框架梁 与 柱，而对底部大空间结构，仅加固框架梁、柱并不能显著提高结构的 整体 抗震性能，应采取 其它 更为有效的加固方法，比如 在 首层 增加 填充墙或剪力墙等 措施 。 关键词： 钢筋混凝土框架 填充墙结构； 碳纤维； 抗震加固 ； Perform-3D； 弹塑性静力分析 ； 弹塑性动力时程分析 哈尔滨工业大学工学硕
2、士学位论文 - III - Abstract During the WenChuan earthquake in 2008, the RC frames with infill wall suffered serious damages, and the failure mechanism of “strong columns and weak beams” for frame structures which was actively implemented by every country almost did not get any reflection. As a result of
3、the constraint enhancement of infill wall to the flexural rigidity of the frame beams, the plastic hinges appeared in the upper and bottom end of the column for the majority of infilled frames, thus leading to the collapse of the whole structure, and the damage mechanism of “strong beams and weak co
4、lumns” was showed by the frames. Simultaneously, failure of weak floor due to the discontinuous of infill wall along the vertical direction of the building, torsion damage due to the asymmetric plane layout of the infill wall, shear failure of the short column due to the presence of the wall between
5、 the windows, casualties and escape route blocking due to the collapse of the infill wall had been seen everywhere. The serious damages of infilled RC frames in WenChuan earthquake had aroused wide attention and thinking in the civil engineering filed of our country, and people start to review the c
6、ollaborative work mechanism between the infill wall and frame, as well as the influences of infill wall on the frame structures overall seismic performance. After the WenChuan earthquake event, the design requirements for infilled frame structures have been improved in our newly issued seismic codes
7、, thus causing most of the existing infilled frames designed according to old codes to fail to meet the requirements of the new codes. Facing the possibility of earthquake disasters at any time, it is better for us to rehabilitate existing infilled RC frame structures before the earthquake rather th
8、an implement large-scale demolition and reconstruction in order to alleviate the seismic risks faced by existing structures. The seismic retrofit for existing infilled RC frames before the earthquake happens has been made an extremely urgent matter by the painful experience in WenChuan earthquake. I
9、n this paper, the influence law of infill wall on the frames and the appropriate methods of seismic retrofit for infilled frame structures using CFRP were investigated, and the main contents of the study were summarized as follows: 1. The equivalent diagonal strut model used to simulate the infill w
10、all was determined first, and then the quasi static and shaking table test was conducted numerical simulation analysis using Perform-3D software, respectively. The correctness of pushover and time history analysis based on Perform-3D, including the equivalent diagonal strut model was proved by compa
11、ring the calculated results to the test records; 2. Based on Perform-3D software, the static and dynamic analyses for two kinds of infilled frames were conducted, and they referred to frames with infill wall arranged in every story and only in two to top story, respectively. By comparing with the an
12、alysis 哈尔滨工业大学工学硕士学位论文 - IV - results of bare frame, the influences of infill wall on the overall seismic performance of these two structures have been determined; 3. Different retrofit schemes using CFRP were designed for these two structures, and the overall seismic performance of retrofitted fram
13、e versus frame without retrofit were compared under different retrofit schemes, finally, the appropriate retrofit methods by CFRP of infilled RC frames were determined. Based on the study above, several conclusions have been obtained: (1) For the first infilled RC frame, the lower vibration modes of
14、 the structure were significantly influenced by the infill wall, and the reduction coefficient of natural periods of vibration were distributed between 0.4 and 0.6; (2) When considering the effect of infill wall, the lateral bearing capacity and stiffness of the first frame was 1.7 and 5 times that
15、of the bare frame, respectively, while for the second infilled frame, the lateral bearing capacity changed a little; (3) Due to the stiffness contribution of infill wall, the deformation capacity of infilled frame were reduced dramatically, especially for the second frame, the first story was more i
16、nclined to be the weak floor, and only columns in the first story were the main energy-consuming components under the seismic action, the overall seismic performance of the structure was bad; (4) The peak acceleration of the maximum ground motion which the structure can resist was reduced while the effects of infill wall were included, and the seismic ability of the structure was weakened, simultaneously, the frame was more easily to form the failure mechanism of “strong beams an
