基于能力谱法的FRP加固混凝土结构抗震性能分析
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摘要
Pushover分析方法是一种评估结构抗震能力的方法,主要用于对现有结构或者设计方案进行抗侧移能力验算,它有效地避免了非线性动力分析方法的复杂计算,是一种简单有效的结构抗震能力评价工具。FRP抗震加固混凝土结构具有施工方便、质量易于控制且不会影响原有结构体系的正常使用和加固后钢筋混凝土柱的刚度等优点,但现阶段研究主要集中在FRP抗震约束混凝土构件方面,针对结构性能的研究尚显不足。将Pushover分析方法与FRP抗震加固结合起来的加固设计方法能有效地分析出原结构的薄弱环节及加固后结构性能提高的具体信息。
本文主要针对与Pushover分析结合的FRP抗震约束加固设计方法的具体计算过程及其对加固结构性能的影响进行研究。
一方面,通过与60个地震动记录统计分析得出的平均强度折减系数谱的比较,对能力谱方法的核心内容之一强度折减系数模型进行分析,结果表明,各种场地条件下,Fajfar模型综合表现最优。
另一方面,从FRP约束混凝土柱构件的试验和理论研究两方面对三类FRP抗震加固设计方法:直接加固设计法、等效配箍法和FRP约束混凝土截面分析法进行研究比较,结果表明,FRP约束混凝土截面分析法能分析FRP约束混凝土构件所有重要性能特征段(弹性段、屈服段和破坏段)且结果准确,是现阶段研究FRP约束混凝土构件性能的理想方法。
最后,通过对梁、柱构件截面分析的方法,对一个6层的混凝土框架结构进行FRP抗震加固设计,阐述与Pushover分析结合的FRP抗震加固设计方法的具体计算过程,并对加固前后结构的性能进行比较,结果表明,FRP抗震加固有效提高了结构的延性,大大增强了结构的抗震性能,与能力谱方法的结合使用,能清楚显示出原结构的薄弱环节及加固后结构提高的具体信息,是一种理想的FRP抗震加固设计方法。
The pushover analysis method is a good means to evaluate the earthquake-resistance of building structures, which has been widely used in the reassessment of lateral force resistant system of as-built structures or newly-designed structures. This simple and effective method does not contain the complex solution process as included in commonly-used nonlinear dynamic analysis method. The application of fiber reinforced polymer (FRP) to the seismic retrofit of concrete structures can lead to more efficient construction process and easier quality control. Unfortunately, the technologies of retrofitting with FRP are now focusing on capabilities of the elements but the structures. The technologies of retrofitting with FRP could find the weakness of the original structure and particular enhancement of the retrofitted structure if it was used with the pushover analysis method.
Here, the researches are mostly on the particular process of the technologies retrofitting with FRP used with pushover analysis method besides the discussion of the capability of the retrofitted structures.
One side, the strength reduction factor models are compared which is the core of the Capacity spectrum method with the average strength reduction factor spectrum got through the statistical analysis of 60 earthquakes, the result shows that Fajfar model is mostly the best in all kinds of sites.
On the other side, 3 retrofit methods based on experiments and theories are been compared, they are direct retrofit method, equivalent hoop method and the analysis of the section of the element retrofitted with FRP. At last, the result shows that the analysis of the section of the element retrofitting with FRP can compute the most important character points like elastic point, yield point and ultimate point, besides, it gives us the best result, it is the ideal method to research the capability of the elements retrofitted with FRP today.
At last, the particular compute progress of the technologies retrofitted with FRP used with pushover analysis method is showed through a 6 stories structure which elements is defined by the analysis of the section. After the compare of the capabilities of the original structure and the retrofitted structure, the result shows that the structure’s ductility after retrofitted effetely enhanced and the capacity of resisting earthquakes is much better. The technologies retrofitting with FRP used with capacity pectrum method can show the weakness of the origin structure and the enhancement of retrofitted structure clearly, is an ideal design method using FRP.
本文主要针对与Pushover分析结合的FRP抗震约束加固设计方法的具体计算过程及其对加固结构性能的影响进行研究。
一方面,通过与60个地震动记录统计分析得出的平均强度折减系数谱的比较,对能力谱方法的核心内容之一强度折减系数模型进行分析,结果表明,各种场地条件下,Fajfar模型综合表现最优。
另一方面,从FRP约束混凝土柱构件的试验和理论研究两方面对三类FRP抗震加固设计方法:直接加固设计法、等效配箍法和FRP约束混凝土截面分析法进行研究比较,结果表明,FRP约束混凝土截面分析法能分析FRP约束混凝土构件所有重要性能特征段(弹性段、屈服段和破坏段)且结果准确,是现阶段研究FRP约束混凝土构件性能的理想方法。
最后,通过对梁、柱构件截面分析的方法,对一个6层的混凝土框架结构进行FRP抗震加固设计,阐述与Pushover分析结合的FRP抗震加固设计方法的具体计算过程,并对加固前后结构的性能进行比较,结果表明,FRP抗震加固有效提高了结构的延性,大大增强了结构的抗震性能,与能力谱方法的结合使用,能清楚显示出原结构的薄弱环节及加固后结构提高的具体信息,是一种理想的FRP抗震加固设计方法。
The pushover analysis method is a good means to evaluate the earthquake-resistance of building structures, which has been widely used in the reassessment of lateral force resistant system of as-built structures or newly-designed structures. This simple and effective method does not contain the complex solution process as included in commonly-used nonlinear dynamic analysis method. The application of fiber reinforced polymer (FRP) to the seismic retrofit of concrete structures can lead to more efficient construction process and easier quality control. Unfortunately, the technologies of retrofitting with FRP are now focusing on capabilities of the elements but the structures. The technologies of retrofitting with FRP could find the weakness of the original structure and particular enhancement of the retrofitted structure if it was used with the pushover analysis method.
Here, the researches are mostly on the particular process of the technologies retrofitting with FRP used with pushover analysis method besides the discussion of the capability of the retrofitted structures.
One side, the strength reduction factor models are compared which is the core of the Capacity spectrum method with the average strength reduction factor spectrum got through the statistical analysis of 60 earthquakes, the result shows that Fajfar model is mostly the best in all kinds of sites.
On the other side, 3 retrofit methods based on experiments and theories are been compared, they are direct retrofit method, equivalent hoop method and the analysis of the section of the element retrofitted with FRP. At last, the result shows that the analysis of the section of the element retrofitting with FRP can compute the most important character points like elastic point, yield point and ultimate point, besides, it gives us the best result, it is the ideal method to research the capability of the elements retrofitted with FRP today.
At last, the particular compute progress of the technologies retrofitted with FRP used with pushover analysis method is showed through a 6 stories structure which elements is defined by the analysis of the section. After the compare of the capabilities of the original structure and the retrofitted structure, the result shows that the structure’s ductility after retrofitted effetely enhanced and the capacity of resisting earthquakes is much better. The technologies retrofitting with FRP used with capacity pectrum method can show the weakness of the origin structure and the enhancement of retrofitted structure clearly, is an ideal design method using FRP.
引文
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