發(fā)布時間：2018-10-13 08:41

【摘要】：在偶然荷載作用下,鋼筋混凝土框架結(jié)構(gòu)的承重構(gòu)件失效破壞繼而無法繼續(xù)支撐上部結(jié)構(gòu),導(dǎo)致結(jié)構(gòu)發(fā)生局部倒塌,由于建造的連貫性和整體性,局部倒塌易引發(fā)結(jié)構(gòu)不成比例的整體連續(xù)性倒塌。如何通過對RC框架結(jié)構(gòu)進行加固來提高其抗連續(xù)倒塌能力已成為工程加固的研究熱點�？紤]CFRP片材較強抗拉強度、不增加結(jié)構(gòu)附荷、耐腐蝕等優(yōu)良特點,利用CFRP片材對結(jié)構(gòu)進行加固從而提高結(jié)構(gòu)抗連續(xù)倒塌性能的方法正逐漸成為一種趨勢,該種加固技術(shù)具備良好的使用前途。為探究CFRP加固RC框架結(jié)構(gòu)提高結(jié)構(gòu)抗連續(xù)性倒塌性能的影響,本文通過對比研究未加固試件和加固試件的抗連續(xù)倒塌性能,對兩榀梁柱子結(jié)構(gòu)分別進行了抗連續(xù)倒塌試驗和理論分析。主要研究內(nèi)容如下所示:1、對兩榀相同的單層、4跨RC梁柱子結(jié)構(gòu)分別進行抗連續(xù)倒塌擬靜力試驗,其中一榀為未加固試件,另外一榀為在梁上表面進行CFRP布加固。通過對比分析試件失效柱荷載—位移曲線、梁關(guān)鍵截面鋼筋應(yīng)變、試件破壞形式、結(jié)構(gòu)最終倒塌承載力及極限變形等影響因素,討論CFRP加固方案對結(jié)構(gòu)抗連續(xù)倒塌能力的提升效果。2、根據(jù)RC框架梁柱子結(jié)構(gòu)在連續(xù)倒塌過程中的抗力來源方式,將抗力機制分為梁端彎矩作用、壓拱效應(yīng)作用及懸鏈線機制作用,提出各機制作用階段的簡化承載力峰值計算公式,比較承載力計算值和實際值,與實際較吻合。3、對兩組試驗分別進行基于OpenSees軟件的有限元數(shù)值分析,比較荷載—位移曲線的分析值和實際值,分析結(jié)果實際結(jié)果吻合度較高。在此基礎(chǔ)上,分析了CFRP布加固層數(shù)對結(jié)構(gòu)抗連續(xù)倒塌承載力的影響,得出加固層數(shù)與承載力提高之間并不呈線性關(guān)系。
[Abstract]:Under the action of accidental load, the failure of the load-bearing members of reinforced concrete frame structure leads to the failure of supporting the superstructure, which leads to the local collapse of the structure, due to the consistency and integrity of the construction. Local collapse can lead to the continuous collapse of the whole structure which is out of proportion. How to strengthen the RC frame structure to improve its continuous collapse resistance has become the focus of engineering reinforcement. Considering the excellent characteristics of CFRP sheet, such as strong tensile strength, no increase of structural load, corrosion resistance, etc., the method of strengthening the structure by using CFRP sheet to improve the continuous collapse resistance of the structure is becoming a trend gradually. This kind of reinforcement technology has good application prospect. In order to investigate the effect of CFRP on the continuous collapse resistance of RC frame structures, the continuous collapse resistance of unreinforced and strengthened RC frame structures is studied by comparison. Two Liang Zhu substructures were subjected to continuous collapse test and theoretical analysis. The main contents of the study are as follows: 1. Two identical monolayer and four-span RC Liang Zhu substructures were subjected to continuous collapse pseudostatic tests, one of which was unreinforced and the other was strengthened with CFRP sheet on the top surface of the beam. By comparing and analyzing the load-displacement curve of the failure column, the strain of the key section of the beam, the failure form of the specimen, the ultimate collapse bearing capacity and the ultimate deformation of the structure, and so on, The effect of CFRP reinforcement scheme on continuous collapse resistance of structure is discussed. 2. According to the resistance source mode of RC frame beam-column structure during continuous collapse, the resistance mechanism is divided into bending moment at the end of beam. The pressure-arch effect and catenary mechanism are analyzed. A simplified formula for calculating the peak value of bearing capacity is put forward, and the calculated value of bearing capacity is compared with the actual value. 3. The finite element numerical analysis based on OpenSees software is carried out for the two groups of tests, and the analysis value of load-displacement curve is compared with the actual value. On this basis, the influence of the number of strengthened layers of CFRP cloth on the bearing capacity of the structure against continuous collapse is analyzed, and it is concluded that there is no linear relationship between the number of strengthened layers and the increase of the bearing capacity.
【學(xué)位授予單位】：蘇州科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU375

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