地面交通激勵下古建筑影響及古木結(jié)構(gòu)損傷識別研究
發(fā)布時間：2019-07-02 14:07
【摘要】：古建筑在幾百年甚至上千年使用過程中,環(huán)境侵蝕、材料老化和荷載的長期效應(yīng)、疲勞效應(yīng)等因素共同作用下不可避免出現(xiàn)結(jié)構(gòu)系統(tǒng)的損傷積累和抗力衰減。隨著城市的經(jīng)濟發(fā)展,地面交通車輛密度越來越大,對古建筑的安全產(chǎn)生了重要影響,因此有必要定量評價交通激勵下對古建筑的影響,并利用環(huán)境激勵的結(jié)構(gòu)振動響應(yīng)數(shù)據(jù)對古建筑結(jié)構(gòu)進行健康監(jiān)測和安全評估。西安鐘樓和西安城墻是國家重點文物保護單位,本文就地面交通車輛行駛產(chǎn)生的微幅振動對西安鐘樓和城墻的影響進行數(shù)值分析和安全評估,研究環(huán)境激勵下基于小波包能量譜的古木結(jié)構(gòu)的損傷識別指標,將其應(yīng)用到西安鐘樓上部木框架的損傷識別中。本文的主要研究內(nèi)容如下:(1)以西安鐘樓和城墻為研究對象,采用數(shù)值分析方法建立了鐘樓上部木框架-高臺基-圓柱形地基和城墻-地基的三維有限元模型,對地面車輛在鐘樓環(huán)道行駛和從城墻門洞下行駛產(chǎn)生的微幅振動對鐘樓和城墻的影響和安全評估進行研究。(2)對隨機環(huán)境激勵下的古木框架結(jié)構(gòu)的損傷進行有限元模擬,采用小波包能量譜建立古木結(jié)構(gòu)的損傷識別指標,并進行小波函數(shù)的選擇、小波包分解層次的選擇、損傷識別指標的損傷敏感性和噪聲的影響分析。(3)對隨機環(huán)境激勵下的古木框架結(jié)構(gòu)梁上各節(jié)點的加速度響應(yīng)信號進行小波包分解,提出小波包能量曲率差損傷識別指標對古木結(jié)構(gòu)進行損傷定位,建立損傷指標與損傷程度的關(guān)系式并進行古木結(jié)構(gòu)損傷程度的判斷,并驗算適用性。(4)以西安鐘樓為研究對象,對鐘樓上部木框架結(jié)構(gòu)的損傷進行有限元模擬,就地面車輛在鐘樓環(huán)道行駛產(chǎn)生的微幅振動對鐘樓結(jié)構(gòu)的影響進行損傷識別研究,采用小波包能量譜建立了鐘樓木框架結(jié)構(gòu)的損傷識別指標,從小波函數(shù)的選擇、小波包分解層次的選擇、損傷敏感性和噪聲的影響進行了研究。(5)以西安鐘樓為研究對象,就地面車輛在鐘樓環(huán)道行駛產(chǎn)生的微幅振動對鐘樓結(jié)構(gòu)的影響進行了損傷識別研究,提出了小波包能量曲率差損傷指標對鐘樓上部木框架進行損傷定位,并進行損傷敏感性和噪聲的影響分析,建立損傷指標與損傷程度的關(guān)系并進行鐘樓木框架結(jié)構(gòu)損傷程度的判斷。(6)對西安鐘樓在地面交通微幅振動下的實測加速度響應(yīng)信號進行小波包能量譜分析,探討了鐘樓實測小波包能量譜和損傷識別指標—能量比偏差ERVD和能量比方差ERVV能敏感地表征地面交通激勵對鐘樓振動的影響,適合于環(huán)境激勵測試下的鐘樓結(jié)構(gòu)的實時損傷識別。
[Abstract]:In the course of hundreds or even thousands of years of use, the damage accumulation and resistance attenuation of structural system inevitably occur under the combined action of environmental erosion, material aging, long-term effect of load, fatigue effect and so on. With the economic development of the city, the density of ground traffic vehicles is increasing, which has an important impact on the safety of ancient buildings. Therefore, it is necessary to quantitatively evaluate the impact of traffic incentives on ancient buildings, and to use the vibration response data of structures excited by environmental incentives to carry out health monitoring and safety assessment of ancient buildings. Xi'an bell tower and Xi'an city wall are key cultural relics protection units in Xi'an. This paper makes numerical analysis and safety assessment on the influence of micro vibration caused by ground traffic vehicles on Xi'an clock tower and city wall, studies the damage identification index of ancient wood structure based on wavelet packet energy spectrum under environmental excitation, and applies it to the damage identification of the upper wood frame of Xi'an clock tower. The main research contents of this paper are as follows: (1) taking Xi'an bell tower and city wall as the research object, the three-dimensional finite element models of the upper wooden frame-high platform foundation-cylindrical foundation and wall-foundation of the clock tower are established by using the numerical analysis method. The influence and safety assessment of the micro vibration of ground vehicles on the bell tower and the wall under the ring road of the bell tower and under the gate hole of the city wall are studied. (2) the damage of the ancient wood frame structure excited by random environment is simulated by finite element method, and the damage identification index of the ancient wood structure is established by using the wavelet packet energy spectrum, and the selection of wavelet function and wavelet packet decomposition level is carried out. The damage sensitivity of damage identification index and the influence of noise are analyzed. (3) the acceleration response signals of each node on the beam of ancient wood frame structure excited by random environment are decomposed by wavelet packet, and the damage identification index of energy curvature difference of wavelet packet is put forward to locate the damage of ancient wood structure, and the relationship between damage index and damage degree is established and the damage degree of ancient wood structure is judged. And check the applicability. (4) taking Xi'an bell tower as the research object, the damage of the upper wooden frame structure of the clock tower is simulated by finite element method, and the damage identification research is carried out on the influence of the micro vibration of the ground vehicle on the bell tower structure. The damage identification index of the clock tower wood frame structure is established by using the wavelet packet energy spectrum. From the selection of wavelet function and the selection of wavelet packet decomposition level, the damage identification index of the clock tower wood frame structure is established. The effects of damage sensitivity and noise on the damage sensitivity and noise are studied. (5) taking Xi'an bell tower as the research object, the damage identification of the influence of micro vibration of ground vehicles on the bell tower structure is carried out, and the damage location of the upper wooden frame of the clock tower is analyzed by the damage index of wavelet packet energy curvature difference, and the damage sensitivity and noise are analyzed. The relationship between damage index and damage degree is established and the damage degree of clock tower wooden frame structure is judged. (6) the measured acceleration response signal of Xi'an clock tower under ground traffic micro-amplitude vibration is analyzed by wavelet packet energy spectrum, and the measured wavelet packet energy spectrum and damage identification index-energy ratio deviation ERVD and energy difference ERVV can be sensitive to the influence of ground traffic excitation on the vibration of clock tower. It is suitable for real-time damage identification of bell tower structure under environmental excitation test.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TU317
本文編號：2508995
[Abstract]:In the course of hundreds or even thousands of years of use, the damage accumulation and resistance attenuation of structural system inevitably occur under the combined action of environmental erosion, material aging, long-term effect of load, fatigue effect and so on. With the economic development of the city, the density of ground traffic vehicles is increasing, which has an important impact on the safety of ancient buildings. Therefore, it is necessary to quantitatively evaluate the impact of traffic incentives on ancient buildings, and to use the vibration response data of structures excited by environmental incentives to carry out health monitoring and safety assessment of ancient buildings. Xi'an bell tower and Xi'an city wall are key cultural relics protection units in Xi'an. This paper makes numerical analysis and safety assessment on the influence of micro vibration caused by ground traffic vehicles on Xi'an clock tower and city wall, studies the damage identification index of ancient wood structure based on wavelet packet energy spectrum under environmental excitation, and applies it to the damage identification of the upper wood frame of Xi'an clock tower. The main research contents of this paper are as follows: (1) taking Xi'an bell tower and city wall as the research object, the three-dimensional finite element models of the upper wooden frame-high platform foundation-cylindrical foundation and wall-foundation of the clock tower are established by using the numerical analysis method. The influence and safety assessment of the micro vibration of ground vehicles on the bell tower and the wall under the ring road of the bell tower and under the gate hole of the city wall are studied. (2) the damage of the ancient wood frame structure excited by random environment is simulated by finite element method, and the damage identification index of the ancient wood structure is established by using the wavelet packet energy spectrum, and the selection of wavelet function and wavelet packet decomposition level is carried out. The damage sensitivity of damage identification index and the influence of noise are analyzed. (3) the acceleration response signals of each node on the beam of ancient wood frame structure excited by random environment are decomposed by wavelet packet, and the damage identification index of energy curvature difference of wavelet packet is put forward to locate the damage of ancient wood structure, and the relationship between damage index and damage degree is established and the damage degree of ancient wood structure is judged. And check the applicability. (4) taking Xi'an bell tower as the research object, the damage of the upper wooden frame structure of the clock tower is simulated by finite element method, and the damage identification research is carried out on the influence of the micro vibration of the ground vehicle on the bell tower structure. The damage identification index of the clock tower wood frame structure is established by using the wavelet packet energy spectrum. From the selection of wavelet function and the selection of wavelet packet decomposition level, the damage identification index of the clock tower wood frame structure is established. The effects of damage sensitivity and noise on the damage sensitivity and noise are studied. (5) taking Xi'an bell tower as the research object, the damage identification of the influence of micro vibration of ground vehicles on the bell tower structure is carried out, and the damage location of the upper wooden frame of the clock tower is analyzed by the damage index of wavelet packet energy curvature difference, and the damage sensitivity and noise are analyzed. The relationship between damage index and damage degree is established and the damage degree of clock tower wooden frame structure is judged. (6) the measured acceleration response signal of Xi'an clock tower under ground traffic micro-amplitude vibration is analyzed by wavelet packet energy spectrum, and the measured wavelet packet energy spectrum and damage identification index-energy ratio deviation ERVD and energy difference ERVV can be sensitive to the influence of ground traffic excitation on the vibration of clock tower. It is suitable for real-time damage identification of bell tower structure under environmental excitation test.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TU317
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