CFRP加固轴心受力钢结构构件的可靠性分析研究

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摘要上世纪中叶大量建设的钢结构厂房、桥梁和铁路，由于环境影响，到现阶段，大部分钢结构已经接近甚至超过使用年限。因此，加固和修复受损的钢结构变得刻不容缓。把钢板焊接、螺接、铆接或者粘贴到结构损伤部位是比较传统的加固方法，它们都在不同程度上损伤了母材。碳纤维的出现为克服以往加固方法的不足提供了更经济有效的解决方案。很多国内外学者在碳纤维加固方面都取得了很大的突破。同时，为了评估该技术的修复效果，学者们进行了大量试验研究，即有限元分析和试验对比验证的方法。但对于加固后的结果很少从可靠度方面进行分析。本文的研究内容如下：51597

（1）概述了国内外碳纤维加固的研究状况及可靠度理论在碳纤维加固中的应用。

（2）在参考相关文献及规范的基础上，通过有限元软件建模，对加固前后的应力进行分析比较，碳纤维加固轴心受力钢结构构件的承载能力极限状态进行分析，建立其承载力极限方程。

（3）对碳纤维加固轴心受力钢构件从可靠度方面进行分析，针对碳纤维加固轴心受力钢构件承载力极限方程，用MATLAB软件计算出可靠度指标。同时对碳纤维加固轴心受力钢构件承载力极限状态下，碳纤维布的性能对可靠度的影响。

（4）对碳纤维布加固轴心受力钢构件进一步进行可靠度指标与分项系数关系的分析，分别计算了抗力和荷载效应的分项系数。

毕业论文关键词：CFRP；损伤加固；可靠性；JC法；林德分离法

Abstract

The middle of the last century a large amount of construction steel structure factory building, Bridges and railways, due to the impact on the environment, to the present stage, most of the steel structure is close to or even more than use fixed number of year. Therefore, strengthening and repair the damaged steel structure become urgent. The steel plate welding, bolt connection, the structure of the riveting or paste to injury is the traditional strengthening methods, they are in different degree damage the parent metal. The emergence of the Carbon Fiber Reinforced Polymers for overcoming the insufficiency of the ever strengthening method provides a more cost-effective solution. Many domestic and foreign scholars have made great breakthrough in the field of Carbon Fiber Reinforced Polymers. At the same time, in order to evaluate the repair effect of the technology, scholars have conducted a large number of experimental study, the finite element analysis and experimental verification of the method. But rarely to reinforcement result is analyzed from the aspects of reliability. In this paper, the research content is as follows:

(1)Summarized the research situation of carbon fiber reinforced plastics at home and abroad and the reliability theory in the application of carbon fiber reinforced plastics.

(2) On the basis of reference literature and specifications, through the finite element modeling software, the stress are analyzed before and after reinforcement, carbon fiber strengthening axial force bearing capacity limit state analysis of steel structures, its bearing capacity limit equation is established.

(3) the axial stress of reinforce in CFRP steel members is analyzed from the aspects of reliability, in view of the axial force bearing capacity of steel members limit equation of carbon fiber reinforced plastics, using MATLAB software to calculate the reliability index. At the same time, the axial force bearing capacity of steel members of reinforce in CFRP under limit state, the performance of the carbon fiber's impact on reliability.

(4) To the axis of the CFRP reinforcement stress steel members for further reliability index and partial coefficient relationship analysis, calculate the partial coefficient of the resistance and load effect.