FRP加固箱形梁刚度计算的研究
发布时间：2018-10-18 12:50
【摘要】：FRP材料由于具有质量轻、加固强度高、加固效率好等优点被广泛的应用到结构加固中去,国内外许多学者对FRP加固进行了研究,从FRP加固构件的受力机理、锚固措施到影响因素等等,包括的范围很广,但是对FRP加固箱梁后的刚度变化情况很少有学者进行研究。箱梁截面的抗弯刚度在控制大跨径桥梁的挠度中占有越来越重的作用,对FRP加固箱梁的刚度在正常使用阶段是否能够正常使用,对箱梁能否正常运营起着决定性的因素。本文对国内外FRP加固钢筋混凝土刚度的基础上,结合国家“973计划”项目《应用FRP实现重大工程结构高性能与长寿命的基础研究》(2012CB026205),对8根碳纤维布加固箱梁进行数值模拟分析,并且在研究的基础之上对FRP加固箱梁在正常使用阶段的刚度公式进行推导和验证。本文研究的主要内容如下： 1)国内外关于FRP加固钢筋混凝土梁的理论和试验研究方面进行了总结,同时对FRP加固钢筋混凝土梁的刚度公式进行概括分析,根据他们公式的推导边界条件、假设、简化,进而分析FRP加固钢筋混凝土梁的刚度公式的优点和不足。 2)采用ANSYS有限元软件对FRP加固箱梁进行数值模拟分析,根据数值模拟分析的结果对FRP加固箱梁的受力特点进行分析；同时分析FRP加固箱梁后,箱梁的刚度变化情况,并且通过和试验箱梁的结果对比,得出本文采用的数值模拟有一定的精度。 3)对FRP加固箱梁刚度的影响因素进行分析,通过比较分析确定影响FRP加固箱梁刚度的主要影响因素,为推导FRP加固箱梁的刚度公式做准备；本文给出了FRP加固箱梁在不同情况下的刚度公式,并采用搜集到的试验数据对推导刚度公式进行验证,得出了本文的刚度公式具有一定的精度能够为工程加固提供指导。
[Abstract]:FRP materials have been widely used in structural strengthening because of their advantages of light weight, high strength and good efficiency. Many scholars at home and abroad have studied the strengthening of FRP, which is based on the mechanical mechanism of FRP strengthened members. The anchoring measures include a wide range of factors, but few scholars have studied the stiffness change of box girder strengthened by FRP. The flexural stiffness of box girder section plays a more and more important role in controlling the deflection of long-span bridge. It plays a decisive role in whether the stiffness of box girder strengthened by FRP can be used normally in the normal service stage and whether the box girder can operate normally. On the basis of strengthening reinforced concrete stiffness of FRP at home and abroad and combining with the national "973 Program" project "basic Research on the Application of FRP to realize High performance and long Life of Major Engineering structures" (2012CB026205), the numerical simulation and analysis of 8 CFRP strengthened box girders are carried out in this paper. On the basis of the research, the stiffness formula of FRP strengthened box girder in normal service stage is deduced and verified. The main contents of this paper are as follows: 1) the theoretical and experimental research on reinforced concrete beams strengthened by FRP is summarized, and the stiffness formula of reinforced concrete beams strengthened by FRP is analyzed. According to the derivation of boundary conditions, supposition and simplification of their formulas, the advantages and disadvantages of the stiffness formula of reinforced concrete beams strengthened by FRP are analyzed. 2) numerical simulation of box girder strengthened by FRP is carried out by using ANSYS finite element software. According to the results of numerical simulation analysis, the mechanical characteristics of box girder strengthened by FRP are analyzed, and the stiffness of box girder strengthened by FRP is analyzed, and the results are compared with those of experimental box girder. It is concluded that the numerical simulation adopted in this paper has a certain accuracy. 3) the factors affecting the stiffness of FRP strengthened box girder are analyzed, and the main factors affecting the stiffness of FRP strengthened box girder are determined through comparative analysis. In order to deduce the stiffness formula of FRP strengthened box girder, this paper gives the stiffness formula of FRP strengthened box girder under different conditions, and verifies the derived stiffness formula by the collected experimental data. It is concluded that the stiffness formula of this paper has certain precision and can provide guidance for engineering reinforcement.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U445.72
本文编号：2279174
[Abstract]:FRP materials have been widely used in structural strengthening because of their advantages of light weight, high strength and good efficiency. Many scholars at home and abroad have studied the strengthening of FRP, which is based on the mechanical mechanism of FRP strengthened members. The anchoring measures include a wide range of factors, but few scholars have studied the stiffness change of box girder strengthened by FRP. The flexural stiffness of box girder section plays a more and more important role in controlling the deflection of long-span bridge. It plays a decisive role in whether the stiffness of box girder strengthened by FRP can be used normally in the normal service stage and whether the box girder can operate normally. On the basis of strengthening reinforced concrete stiffness of FRP at home and abroad and combining with the national "973 Program" project "basic Research on the Application of FRP to realize High performance and long Life of Major Engineering structures" (2012CB026205), the numerical simulation and analysis of 8 CFRP strengthened box girders are carried out in this paper. On the basis of the research, the stiffness formula of FRP strengthened box girder in normal service stage is deduced and verified. The main contents of this paper are as follows: 1) the theoretical and experimental research on reinforced concrete beams strengthened by FRP is summarized, and the stiffness formula of reinforced concrete beams strengthened by FRP is analyzed. According to the derivation of boundary conditions, supposition and simplification of their formulas, the advantages and disadvantages of the stiffness formula of reinforced concrete beams strengthened by FRP are analyzed. 2) numerical simulation of box girder strengthened by FRP is carried out by using ANSYS finite element software. According to the results of numerical simulation analysis, the mechanical characteristics of box girder strengthened by FRP are analyzed, and the stiffness of box girder strengthened by FRP is analyzed, and the results are compared with those of experimental box girder. It is concluded that the numerical simulation adopted in this paper has a certain accuracy. 3) the factors affecting the stiffness of FRP strengthened box girder are analyzed, and the main factors affecting the stiffness of FRP strengthened box girder are determined through comparative analysis. In order to deduce the stiffness formula of FRP strengthened box girder, this paper gives the stiffness formula of FRP strengthened box girder under different conditions, and verifies the derived stiffness formula by the collected experimental data. It is concluded that the stiffness formula of this paper has certain precision and can provide guidance for engineering reinforcement.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U445.72
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