钢筋混凝土结构置换加固及抽柱过程的内力变化研究

发布时间：2018-05-10 07:25

本文选题：置换加固 + 卸荷　；参考：《山东建筑大学》2017年硕士论文

【摘要】：近几十年来,我国的建筑业取得了突飞猛进的发展和巨大的成就,与此同时我国的工程质量问题也较为严重,由于局部混凝土强度不足而产生的工程质量问题所占比例较大。置换混凝土加固法通常用于局部混凝土有严重缺陷的混凝土构件的加固,能从根本上解决混凝土强度不足的问题。剪力墙结构具有刚度大、抗震性能好的优点,在住宅等高层建筑中占据了重要的地位。因此研究钢筋混凝土剪力墙结构在置换加固中的内力变化具有一定的现实意义。抽柱工程主要用于建筑使用功能改变,需要增大使用空间的托换工程。研究抽柱过程中建筑结构的内力变化可以为类似的工程提供一定的试验依据。本文主要对三个工程的施工及施工过程的内力变化进行了研究,并对试验进行了PKPM计算及有限元模拟,将模拟结果与试验结果做了对比分析。首先对工程背景情况做了简要概述,并介绍了主要施工过程及试验方案。然后采用PKPM结构系列软件对工程结构进行了内力计算,并与试验获得的数据进行对比分析,比较了软件模拟与试验结果的差别。A工程结果表明:剔除T型墙的腹板墙后对翼缘墙垛的轴力影响较大,对其他邻近墙体的轴力影响较小,剔除腹板墙上部的暗梁后对与暗梁相连的连梁的弯矩影响较大,对其他构件的内力影响较小。B工程结果表明:当墙肢较短且邻近刚度较大的墙肢时,剔除墙体后该墙体的轴力将通过内力重分布分配到其他邻近的墙体上,结构构件内力、位移变化较小。C工程结果表明:对于具有坡屋顶的顶层结构,在“拱”效应的有利作用下,当抽掉下部柱后,周边梁的弯矩变化减小,梁位移大约可以减少28%。最后介绍了置换混凝土加固法的优缺点,提出在类似工程下可以利用T型剪力墙的翼缘墙肢的有利作用采用免支撑加固法,从而减轻置换加固法存在的施工工艺复杂、加固成本高、施工技术难度高等问题。
[Abstract]:In recent decades, the construction industry of our country has made great progress and great achievement, at the same time, the engineering quality problem of our country is also more serious, because of the partial concrete strength insufficiency, the engineering quality problem accounts for a large proportion. The replacement concrete reinforcement method is usually used to reinforce concrete members with serious defects in local concrete, which can fundamentally solve the problem of insufficient concrete strength. Shear wall structure has the advantages of high stiffness and good seismic performance, and plays an important role in high-rise buildings such as residential buildings. Therefore, it is of practical significance to study the change of internal force of reinforced concrete shear wall structure in replacement reinforcement. Pillar extraction project is mainly used to change the function of building, and needs to increase the use space of the underpinning project. The study of the variation of the internal force of the building structure during the pumping process can provide a certain experimental basis for similar projects. In this paper, the internal force changes of the construction and construction process of the three projects are studied, and the PKPM calculation and finite element simulation of the test are carried out, and the simulation results are compared with the experimental results. Firstly, the background of the project is briefly summarized, and the main construction process and test plan are introduced. Then, the internal force of the engineering structure is calculated by using the PKPM structure series software, and the data obtained from the test are compared and analyzed. The difference between software simulation and test results is compared. The engineering results show that after removing the web wall of T-shaped wall, the axial force of flange wall is greatly affected, and the axial force of other adjacent walls is less affected. After removing the dark beam on the web wall, the bending moment of the connected beam connected with the dark beam is greatly affected, and the engineering results show that when the wall limb is shorter and the stiffness is larger, the influence on the internal force of other members is small. After removing the wall, the axial force of the wall will be redistributed to other adjacent walls through the internal force distribution. The engineering results show that the internal force and displacement of the structural members change less. The engineering results show that: for the top structure with sloping roof, Under the favorable effect of "arch" effect, when the lower column is removed, the bending moment of the peripheral beam decreases, and the beam displacement can be reduced by 28%. Finally, the advantages and disadvantages of the replacement concrete reinforcement method are introduced, and the advantages of the flange wall limb of the T-type shear wall can be used in similar projects, so as to reduce the complexity of the construction technology of the replacement reinforcement method. The cost of reinforcement is high, the construction technology is difficult and so on.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU746.3

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