【摘要】：城市橋梁作為城市交通的重要組成部分,其健康狀態(tài)是交通運(yùn)輸系統(tǒng)正常運(yùn)轉(zhuǎn)的前提。隨著橋梁服役時(shí)間增長(zhǎng),由于環(huán)境侵蝕、材料老化和荷載的長(zhǎng)期效應(yīng)、疲勞效應(yīng)等原因,目前已有不少橋梁存在損傷,極大的影響了橋梁結(jié)構(gòu)的正常使用。橋梁一旦發(fā)生破壞,將會(huì)造成嚴(yán)重的生命財(cái)產(chǎn)損失,影響社會(huì)安定。因此研究適合城市橋梁的損傷識(shí)別方法有重要的理論意義和工程應(yīng)用價(jià)值。文章基于目前的工程結(jié)構(gòu)損傷識(shí)別的研究現(xiàn)狀,特別是基于影響線(xiàn)的損傷識(shí)別現(xiàn)狀,分析了目前損傷識(shí)別存在的問(wèn)題,針對(duì)簡(jiǎn)支梁橋,提出以損傷前后移動(dòng)荷載作用下簡(jiǎn)支梁橋某點(diǎn)撓度的變化即簡(jiǎn)支梁橋撓度差值影響線(xiàn)為損傷標(biāo)識(shí)量進(jìn)行損傷識(shí)別的方法。主要工作與成果如下:(1)利用虛功原理推導(dǎo)簡(jiǎn)支梁損傷前后某點(diǎn)撓度差值影響線(xiàn)的解析式。得出當(dāng)移動(dòng)荷載位于損傷區(qū)域時(shí),撓度差值與移動(dòng)荷載位置成三次方關(guān)系,而在其它無(wú)損區(qū)域與移動(dòng)荷載位置成線(xiàn)性關(guān)系,撓度差值在損傷位置到達(dá)峰值,由此提出基于撓度差值影響線(xiàn)的簡(jiǎn)支損傷識(shí)別方法。(2)根據(jù)損傷區(qū)域撓度差值與移動(dòng)荷載作用位置成三次方關(guān)系,在無(wú)損區(qū)域與移動(dòng)荷載作用位置成線(xiàn)性關(guān)系的特點(diǎn),提出基于撓度差值影響線(xiàn)二階導(dǎo)數(shù)的簡(jiǎn)支梁損傷識(shí)別方法。(3)移動(dòng)荷載時(shí)程分析結(jié)果表明荷載移動(dòng)載速度對(duì)撓度差值影響線(xiàn)有較大影響。荷載移動(dòng)速度較大時(shí),撓度差值影響線(xiàn)呈現(xiàn)較大的波動(dòng)性和自由振動(dòng),無(wú)法用于損傷識(shí)別。荷載移動(dòng)速度小于5Km/h時(shí),撓度差值影響線(xiàn)呈線(xiàn)性變化,可以對(duì)損傷進(jìn)行有效識(shí)別。(4)數(shù)值模擬和試驗(yàn)結(jié)果表明,利用撓度差值影響線(xiàn)對(duì)簡(jiǎn)支梁?jiǎn)我粨p傷的損傷位置情況有較好識(shí)別效果,對(duì)多處損傷識(shí)別不完全。利用撓度差值影響線(xiàn)二階導(dǎo)數(shù)對(duì)簡(jiǎn)支梁?jiǎn)我粨p傷和多處損傷均有較好識(shí)別效果。
[Abstract]:As an important part of urban traffic, the healthy state of urban bridges is the premise of normal operation of transportation system. With the increase of service time of bridges, due to environmental erosion, material aging and long-term effects of load, fatigue effects and other reasons, there are many bridges damaged, greatly affecting the normal operation of the bridge structure. Once the bridge is destroyed, it will cause serious loss of life and property and affect social stability. Therefore, it is of great theoretical significance and engineering application value to study the damage identification method suitable for urban bridges. Aiming at the existing problems in damage identification of simply supported beam bridges, a damage identification method based on the change of deflection of a point under moving loads before and after damage, i.e. the influence line of deflection difference of simply supported beam bridges, is proposed. The analytical expression of the influence line of the deflection difference is obtained. When the moving load is located in the damage area, the deflection difference has a cubic relationship with the location of the moving load, while it has a linear relationship with the location of the moving load in other non-destructive areas, and the deflection difference reaches a peak value at the damage location. A simple support damage identification method based on the influence line of the deflection difference is proposed. (2) According to the cubic relationship between the deflection difference in the damage area and the location of the moving load, and the linear relationship between the damage area and the location of the moving load, a damage identification method for simply supported beams based on the second derivative of the influence line of the deflection difference is proposed. (3) Time history analysis of the moving load shows that the deflection difference is affected by the moving load velocity. The influence line of deflection difference has great influence. When the load moving speed is large, the influence line of deflection difference presents great fluctuation and free vibration, so it can not be used for damage identification. The second derivative of the influence line of deflection difference is used to identify the single damage and multiple damage of the simply supported beam.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U446

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