框架结构中梁柱节点加固方法研究与有限元分析
发布时间：2018-10-18 09:13
【摘要】：随着近几年来我国地震频发以及人们对房屋安全性的要求越来越高,钢筋混凝土框架结构梁柱节点的加固成为了一个必要的研究方向。国内外学者对框架结构节点加固后的受力及抗震性能进行了大量的试验研究,但对不同方法加固效果进行对比的理论研究还较少。本文主要介绍了节点的受力机理和两种目前常用的节点加固方法：粘贴钢板加固法和粘贴碳纤维加固法。以成都某公司办公楼边节点为工程背景,根据有限元思想,采用有限元软件MIDAS/FEA对两种方法加固后节点的抗震性能进行对比,并且通过对节点抗剪承载力的验算验证了有限元分析的结果。研究发现,两种加固方法均能够不同程度的优化节点的抗震性能和提高节点的抗剪能力,粘贴钢板加固法显示出了更强的优势。本文重点研究了轴压比、混凝土强度等级、钢板厚度、碳纤维布置层数、不同碳纤维型号等关键因素对加固效果的影响程度。结果表明：轴压比在一定限值的情况下能够对加固效果起到有利作用,当超过一定值则会起到不利作用；存在一个最经济合理的混凝土等级,本文建议在C35～C45之间选用；钢板厚度在2-6mm、碳纤维层数在2-3层之间选用对加固最为有效；在选择加固方法和加固材料时,还应进行经济性方面的考虑。本文的研究成果,对节点加固工程实践能够起到一定的参考作用。
[Abstract]:With the frequent occurrence of earthquakes in China and the increasing demand for building safety in recent years, the reinforcement of Liang Zhu joints of reinforced concrete frame structure has become a necessary research direction. Scholars at home and abroad have carried out a large number of experimental studies on the strength and seismic behavior of frame structure joints after reinforcement, but there are few theoretical studies on the comparison of the effects of different reinforcement methods. This paper mainly introduces the mechanical mechanism of the joint and two commonly used strengthening methods of the joint: the method of bonding steel plate and the method of strengthening with carbon fiber. Based on the idea of finite element method, the seismic behavior of the joints strengthened by the two methods is compared by using the finite element software MIDAS/FEA, taking the side joints of a company office building in Chengdu as the engineering background. The results of finite element analysis are verified by checking the shear capacity of joints. It is found that the two reinforcement methods can improve the seismic performance of joints and the shear resistance of joints to varying degrees. In this paper, the key factors such as axial compression ratio, strength grade of concrete, thickness of steel plate, number of layers of carbon fiber arrangement and different types of carbon fiber are studied. The results show that the axial compression ratio can play a beneficial role in the reinforcement effect under the condition of certain limit value, and when the axial compression ratio exceeds a certain value, there is a most economical and reasonable concrete grade, which is suggested to be selected between C35~C45. The thickness of steel plate is 2-6 mm and the number of carbon fiber layers is 2-3 layers. The research results of this paper can play a certain reference role in the practice of joint reinforcement engineering.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375.4
本文编号：2278672
[Abstract]:With the frequent occurrence of earthquakes in China and the increasing demand for building safety in recent years, the reinforcement of Liang Zhu joints of reinforced concrete frame structure has become a necessary research direction. Scholars at home and abroad have carried out a large number of experimental studies on the strength and seismic behavior of frame structure joints after reinforcement, but there are few theoretical studies on the comparison of the effects of different reinforcement methods. This paper mainly introduces the mechanical mechanism of the joint and two commonly used strengthening methods of the joint: the method of bonding steel plate and the method of strengthening with carbon fiber. Based on the idea of finite element method, the seismic behavior of the joints strengthened by the two methods is compared by using the finite element software MIDAS/FEA, taking the side joints of a company office building in Chengdu as the engineering background. The results of finite element analysis are verified by checking the shear capacity of joints. It is found that the two reinforcement methods can improve the seismic performance of joints and the shear resistance of joints to varying degrees. In this paper, the key factors such as axial compression ratio, strength grade of concrete, thickness of steel plate, number of layers of carbon fiber arrangement and different types of carbon fiber are studied. The results show that the axial compression ratio can play a beneficial role in the reinforcement effect under the condition of certain limit value, and when the axial compression ratio exceeds a certain value, there is a most economical and reasonable concrete grade, which is suggested to be selected between C35~C45. The thickness of steel plate is 2-6 mm and the number of carbon fiber layers is 2-3 layers. The research results of this paper can play a certain reference role in the practice of joint reinforcement engineering.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375.4
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