發(fā)布時間：2018-02-27 01:31

  本文關鍵詞： 地震損傷 物理參數(shù)辨識 恢復力曲線 修復與加固　出處：《重慶大學》2014年碩士論文　論文類型：學位論文

【摘要】：結(jié)構(gòu)的地震損傷可以通過結(jié)構(gòu)物理參數(shù)的變化來估計，這樣就可以借助于結(jié)構(gòu)物理參數(shù)識別方法來識別結(jié)構(gòu)的地震損傷。為了達到這個目的，首先需要識別出結(jié)構(gòu)損傷后的物理參數(shù)，然后計算損傷前后的變化量，并建立這種變化與結(jié)構(gòu)損傷狀態(tài)參數(shù)間的關系，進而對結(jié)構(gòu)地震損傷進行評定與修復加固。本文針對框架結(jié)構(gòu)，采取復合反演算法、分頻段加權最小二乘法兩種方法對框架結(jié)構(gòu)進行震前震后剛度識別，然后根據(jù)剛度的下降，確定結(jié)構(gòu)的損傷量，進而完成對整體結(jié)構(gòu)的加固與修復。歸納起來，本文的主要工作有： ①系統(tǒng)闡述了結(jié)構(gòu)物理參數(shù)辨識方法、地震損傷識別模型以及震損結(jié)構(gòu)加固與修復的現(xiàn)狀與發(fā)展。 ②探討了復合反演算法的基本理論以及計算流程，使用復合反演算法針對框架結(jié)構(gòu)在輸入條件未知的情況下進行物理參數(shù)辨識及地震動反演。通過算例證明了該方法的具有較強的抗噪性能，而且能夠完成各中阻尼模型參數(shù)識別的問題。 ③探討了小波函數(shù)的多尺度逼近方法的基本理論，利用以這種理論為基礎的分頻段加權最小二乘法完成框架結(jié)構(gòu)的物理參數(shù)辨識問題。最后與最小二乘法、分頻段最小二乘法進行對比，證明了這種方法的識別精度很高且具有較強的抗噪性能。 ④從材料層次、結(jié)構(gòu)構(gòu)件層次、結(jié)構(gòu)整體層次三個方面探討了地震損傷評估模型。采用了Ghobarah提出的直接以剛度比的形式定義的損傷指標。使用復合反演算法、分頻段加權最小二乘法兩種物理參數(shù)辨識的方法對某框架結(jié)構(gòu)教學樓在地震前后的剛度進行了辨識，最后根據(jù)Ghobarah提出的剛度比模型確定了該框架結(jié)構(gòu)的地震損傷指數(shù)。 ⑤根據(jù)上一章計算出的損傷指數(shù)，建立損傷后結(jié)構(gòu)的恢復力曲線模型，根據(jù)修復后結(jié)構(gòu)的初始剛度與屈服強度和原結(jié)構(gòu)相等的原則，從而確定Pall摩擦型阻尼器所施加的緊固力矩。最后對修復后的結(jié)構(gòu)進行地震響應計算，，并與完好結(jié)構(gòu)對比，證明了加固后的結(jié)構(gòu)不僅具有原有的抗震能力，而且還具有良好的減振的效果。
[Abstract]:The seismic damage of structures can be estimated by the variation of structural physical parameters, so that the seismic damage of structures can be identified by means of structural physical parameters identification. First of all, the physical parameters of the damaged structure should be identified, and then the changes before and after the damage should be calculated, and the relationship between the changes and the damage state parameters of the structure should be established. Then the seismic damage of the frame structure is evaluated and repaired and strengthened. In this paper, the composite inversion algorithm and the weighted least square method are used to identify the stiffness of the frame structure before and after the earthquake, and then according to the decrease of the stiffness, Determine the damage amount of the structure, and then complete the reinforcement and repair of the whole structure. To sum up, the main work of this paper is:. The main contents are as follows: 1. The methods of structural physical parameter identification, seismic damage identification model and the present situation and development of reinforcement and repair of damaged structures are systematically described. 2. The basic theory and calculation flow of compound inversion algorithm are discussed. The composite inversion algorithm is used to identify the physical parameters and the ground motion inversion of the frame structure under unknown input conditions. A numerical example shows that the method has strong anti-noise performance. Moreover, the problem of parameter identification of damping model can be completed. 3. The basic theory of multiscale approximation method of wavelet function is discussed. Based on this theory, the physical parameter identification problem of frame structure is completed by using the frequency division weighted least square method based on this theory. Finally, the least square method is used to identify the physical parameters of the frame structure. Compared with the least square method in frequency band, it is proved that this method has high recognition accuracy and strong anti-noise performance. 4. The seismic damage assessment model is discussed from three aspects: material level, structural member level and whole structure level. The damage index defined by Ghobarah in the form of stiffness ratio is adopted. The composite inversion algorithm is used. The stiffness of a frame structure teaching building before and after an earthquake is identified by two physical parameter identification methods of weighted least square method in frequency band. Finally, the seismic damage index of the frame structure is determined according to the stiffness ratio model proposed by Ghobarah. (5) according to the damage index calculated in the previous chapter, the restoring force curve model of the damaged structure is established. According to the principle that the initial stiffness of the repaired structure is equal to the yield strength and the original structure, Finally, the seismic response of the repaired structure is calculated, and compared with the intact structure, it is proved that the strengthened structure not only has the original aseismic capacity, And also has the good vibration absorption effect.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU317;TU375.4

【參考文獻】

相關期刊論文 前10條

1 羅續(xù)成;實時加權遞推最小二乘估計及其初步應用[J];導彈與航天運載技術;1995年01期

2 歐進萍,牛荻濤,王光遠;多層非線性抗震鋼結(jié)構(gòu)的模糊動力可靠性分析與設計[J];地震工程與工程振動;1990年04期

3 尚久銓;卡爾曼濾波法在結(jié)構(gòu)動態(tài)參數(shù)估計中的應用[J];地震工程與工程振動;1991年02期

4 歐進萍,吳波;壓彎構(gòu)件在主余震作用下的累積損傷試驗研究[J];地震工程與工程振動;1994年03期

5 吳波,李惠,李玉華;結(jié)構(gòu)損傷分析的力學方法[J];地震工程與工程振動;1997年01期

6 張廣瑩,鄧正隆;小波分析在系統(tǒng)辨識中的應用[J];電機與控制學報;2002年01期

7 任宜春;易偉建;;結(jié)構(gòu)物理參數(shù)的分頻段加權辨識[J];工程力學;2007年06期

8 羅曉,陳耀,孫優(yōu)賢;基于小波包分解的非線性時變系統(tǒng)辯識[J];高校應用數(shù)學學報A輯(中文版);2004年01期

9 劉軒黃;嚴格的最小二乘遞推算法[J];海南大學學報(自然科學版);2000年03期

10 白紹良,黃宗明,肖明葵;結(jié)構(gòu)抗震設計的能量分析方法研究述評[J];建筑結(jié)構(gòu);1997年04期

本文編號：1540568