本文選題：型鋼混凝土 + 界面剝離　； 參考：《湖南大學(xué)》2015年碩士論文

【摘要】：近年來(lái),大量的設(shè)計(jì)高度在600米左右的超高層建筑正在中國(guó)建設(shè)。由于具備優(yōu)良的力學(xué)性能,承載能力高,延性好,抗震性能好,具有傳統(tǒng)的鋼筋混凝土結(jié)構(gòu)以及鋼結(jié)構(gòu)所不可以比擬的優(yōu)點(diǎn),型鋼混凝土柱已經(jīng)被廣泛用作超高層建筑豎向承載力構(gòu)件。隨著型鋼混凝土柱截面的增加,兩個(gè)方向的豎向鋼板與水平方向的橫隔板往往會(huì)形成獨(dú)立的腔體,呈現(xiàn)出截面尺寸大型化以及形狀不規(guī)則化的特點(diǎn)。由于大體積混凝土在養(yǎng)護(hù)凝固后,可能會(huì)存在收縮,柱芯混凝土與鋼板界面粘結(jié)狀況及混凝土與橫隔板界面剝離缺陷,一直是一個(gè)嚴(yán)峻的問(wèn)題。由于構(gòu)件的不規(guī)則性,傳統(tǒng)的超聲檢測(cè)方法難以有效的對(duì)缺陷進(jìn)行識(shí)別,界面性能的監(jiān)測(cè)及剝離缺陷的識(shí)別仍然是一個(gè)具有挑戰(zhàn)性的任務(wù)。壓電陶瓷智能材料集驅(qū)動(dòng)傳感于一身,并且具有響應(yīng)速度快、靈敏度高,頻響范圍寬以及線性關(guān)系好等優(yōu)點(diǎn),為型鋼混凝土組合結(jié)構(gòu)界面缺陷識(shí)別提供了新思路。本文提出了一種基于壓電陶瓷的復(fù)雜多腔型鋼混凝土柱界面剝離缺陷識(shí)別方法,并開(kāi)展比例模型試驗(yàn)和應(yīng)用研究。具體工作包括以下幾個(gè)方面:(1)在介紹了壓電陶瓷驅(qū)動(dòng)器、傳感器的制作方法和流程的基礎(chǔ)上詳細(xì)介紹了基于嵌入式壓電驅(qū)動(dòng)和傳感的鋼骨混凝土界面剝離缺陷監(jiān)測(cè)方法,并解釋了激勵(lì)信號(hào)的選取和測(cè)量信號(hào)的分析處理方法。(2)設(shè)計(jì)制作了一個(gè)具有人工模擬界面剝離的具有三個(gè)不規(guī)則腔體的復(fù)雜型鋼混凝土實(shí)驗(yàn)柱,將一定數(shù)量的嵌入式壓電功能元安裝在試驗(yàn)柱鋼板附近,作為驅(qū)動(dòng)器,將粘貼式壓電陶瓷片粘貼在鋼板表面,作為傳感器。分析壓電陶瓷傳感器在正弦信號(hào)激勵(lì)下的幅值及掃頻信號(hào)激勵(lì)下的小波包能量。結(jié)果表明:處于界面剝離區(qū)域的壓電傳感器所接收的正弦信號(hào)幅值及掃頻信號(hào)下的小波包能量明顯小于未剝離區(qū)域,界面剝離缺陷被成功檢測(cè)識(shí)別。驗(yàn)證了本文所提出的方法對(duì)型鋼混凝土柱中混凝土與型鋼之間界面剝離缺陷識(shí)別的有效性。(3)在比例模型試驗(yàn)研究的基礎(chǔ)上,利用本文所提出的方法,利用嵌入式壓電功能元以及壓電陶瓷片對(duì)某一在建的超高層建筑中不規(guī)則型鋼混凝土柱界面粘結(jié)狀態(tài)進(jìn)行監(jiān)測(cè)。兩次監(jiān)測(cè)結(jié)果表明:監(jiān)測(cè)結(jié)果吻合程度很好,被測(cè)型鋼混凝土柱界面粘結(jié)性能良好。
[Abstract]:In recent years, a large number of super-tall buildings with a design height of about 600 meters are being built in China. Because of its excellent mechanical properties, high bearing capacity, good ductility and good seismic performance, it has the advantages of traditional reinforced concrete structures and steel structures. Steel reinforced concrete columns have been widely used as vertical bearing capacity members of super-tall buildings. With the increase of the section of steel reinforced concrete column, the vertical steel plate in two directions and the horizontal plate in horizontal direction often form an independent cavity, showing the characteristics of large section size and irregular shape. Due to the shrinkage of mass concrete after curing and solidification, it is a severe problem that the bond between column core concrete and steel plate and the debonding defect between concrete and transverse partition plate. Because of the irregularity of the components, it is difficult for the traditional ultrasonic detection methods to identify the defects effectively. It is still a challenging task to monitor the interface performance and identify the peeling defects. Piezoelectric ceramic smart material has the advantages of fast response, high sensitivity, wide range of frequency response and good linear relationship, which provides a new idea for the interface defect identification of SRC composite structure. In this paper, a piezoelectric ceramic based method for identifying the interface debonding defects of complex multi-cavity steel reinforced concrete columns is proposed, and the scale model test and application research are carried out. The specific work includes the following aspects: (1) on the basis of introducing the piezoelectric ceramic actuator, the fabrication method and flow chart of the sensor, this paper introduces in detail the monitoring method of the steel reinforced concrete interface debonding defect based on the embedded piezoelectric drive and the sensor. The selection of excitation signal and the analysis and processing method of measurement signal are explained. A complex steel reinforced concrete experimental column with three irregular cavities with artificial simulated interface is designed and fabricated. A certain number of embedded piezoelectric functional elements are installed near the steel plate of the test column as a driver and the adhesive piezoelectric ceramic plate is pasted on the surface of the steel plate as a sensor. The amplitude of piezoelectric ceramic sensor excited by sinusoidal signal and the wavelet packet energy excited by sweep signal are analyzed. The results show that the amplitude of sinusoidal signal and the energy of wavelet packet in the region of interface stripping are obviously lower than those in the region without stripping, and the defect of interface peeling is detected and identified successfully. It is verified that the method proposed in this paper is effective in identifying the interface debonding defects between concrete and section steel in SRC columns. On the basis of the experimental study of the proportional model, the method proposed in this paper is used. The interface bond state of irregular steel reinforced concrete (SRC) columns in a super tall building under construction is monitored by embedded piezoelectric functional element and piezoelectric ceramic chip. The two monitoring results show that the monitoring results are in good agreement with each other and the interfacial bond properties of the steel reinforced concrete columns tested are good.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU398.9;TU317

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