【摘要】：組合結(jié)構(gòu)是土木工程中一種重要的結(jié)構(gòu)形式。目前組合結(jié)構(gòu)結(jié)構(gòu)形式越來越廣泛,并且應(yīng)用組合結(jié)構(gòu)的建筑結(jié)構(gòu)一般較為重要,一旦發(fā)生破壞,造成的社會經(jīng)濟(jì)損失將會非常嚴(yán)重,目前對其的研究主要集中在力學(xué)性能方面,對該結(jié)構(gòu)損傷機(jī)理的認(rèn)識還缺少充分的研究成果。本文主要利用聲發(fā)射監(jiān)測技術(shù)對CFRP-鋼管約束混凝土這一類型的組合結(jié)構(gòu)的損傷發(fā)展和損傷模式識別進(jìn)行了研究,主要內(nèi)容如下：首先,對構(gòu)件層次進(jìn)行了CFRP-鋼管約束混凝土損傷發(fā)展的研究,用聲發(fā)射技術(shù)對CFRP/鋼板復(fù)合材料的拉伸破壞過程進(jìn)行了監(jiān)測,分別進(jìn)行了單軸拉伸和循環(huán)拉伸試驗(yàn)。用哨兵函數(shù)(Sentry Function)對CFRP-鋼板復(fù)合材料的單軸拉伸進(jìn)行了損傷發(fā)展評估,用損傷指數(shù)ID和改進(jìn)損傷指數(shù)MID對CFRP-鋼板復(fù)合材料的循環(huán)拉伸進(jìn)行了損傷發(fā)展評估,兩種方法都能對CFRP-鋼板復(fù)合材料的損傷發(fā)展進(jìn)行評估和預(yù)測。其次,進(jìn)行了CFRP-鋼管復(fù)合約束混凝土柱軸壓作用下的聲發(fā)射監(jiān)測試驗(yàn),并對其損傷發(fā)展進(jìn)行了分析。利用聲發(fā)射累積能量、RA和AF值分析、信號強(qiáng)度分析和b值分析分別對CFRP-鋼管復(fù)合約束混凝土柱在軸壓作用下的受力狀態(tài)、混凝土裂縫形式發(fā)展變化、損傷強(qiáng)弱程度和損傷裂縫的發(fā)展進(jìn)行了分析和評估。分析結(jié)果表明,利用有效的聲發(fā)射參數(shù)能夠很好表征CFRP-鋼管復(fù)合約束混凝土損傷演化過程及其破壞形態(tài)。最后,對利用測得的CFRP-鋼管復(fù)合約束混凝土柱軸壓作用下的聲發(fā)射監(jiān)測數(shù)據(jù),對其的損傷模式進(jìn)行了識別。首先利用首先利用模糊C均值聚類算法將試件的聲發(fā)射信號進(jìn)行聚類,對試件的損傷進(jìn)行了初步識別,根據(jù)聚類結(jié)果,對不同損傷源的聲發(fā)射信號進(jìn)行探討。根據(jù)聚類結(jié)果,利用波形分析技術(shù)和小波分析對各類信號的頻率進(jìn)行分析,進(jìn)一步對試件的損傷進(jìn)行了識別。
[Abstract]:Composite structure is an important structural form in civil engineering. At present, the form of composite structure is more and more extensive, and the building structure with composite structure is generally more important. Once the damage occurs, the social and economic losses will be very serious. At present, the research is mainly focused on the mechanical properties of the structure, and the understanding of the damage mechanism of the structure is still lack of sufficient research results. In this paper, acoustic emission monitoring technology is used to study the damage development and damage pattern identification of CFRP- steel tube confined concrete composite structure. The main contents are as follows: firstly, The damage development of CFRP- steel tube confined concrete was studied. The tensile failure process of CFRP/ steel plate composites was monitored by acoustic emission technique. Uniaxial and cyclic tensile tests were carried out respectively. Sentinel function (Sentry Function) was used to evaluate the damage development of CFRP- composite under uniaxial tension. The damage development of CFRP- composite was evaluated by damage index ID and improved damage index MID. Both methods can be used to evaluate and predict the damage development of CFRP- steel plate composites. Secondly, acoustic emission monitoring test of CFRP- steel tube composite confined concrete column under axial compression is carried out, and its damage development is analyzed. The cumulative energy of acoustic emission, RA and AF value analysis, signal strength analysis and b value analysis are used to analyze the stress state of CFRP- steel tube composite confined concrete column under axial compression, and the development and change of concrete crack form, respectively. The degree of damage and the development of damage crack are analyzed and evaluated. The results show that the damage evolution process and failure pattern of CFRP- steel tube confined concrete can be well characterized by using effective acoustic emission parameters. Finally, the damage mode of CFRP- steel tube composite confined concrete column under axial compression is identified by acoustic emission monitoring data. Firstly, the acoustic emission signals of the samples are clustered by fuzzy C-means clustering algorithm, and the damage of the samples is preliminarily identified. According to the clustering results, the acoustic emission signals from different damage sources are discussed. According to the clustering results, the frequency of various signals is analyzed by waveform analysis and wavelet analysis, and the damage of the samples is further identified.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU37;TU317

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本文編號：2377569