本文選題：車(chē)橋耦合　切入點(diǎn)：吊桿體系　出處：《大連海事大學(xué)》2017年博士論文

【摘要】：拱橋結(jié)構(gòu)在當(dāng)代橋梁建設(shè)中得到越來(lái)越多的應(yīng)用,這一橋型的安全性和耐久性問(wèn)題也日益突出,其中,在中下承式拱橋中以吊桿體系的問(wèn)題最為顯著。近年來(lái)發(fā)生的多起拱橋坍塌事故,大多是由于吊桿體系發(fā)生破壞所導(dǎo)致。研究發(fā)現(xiàn),在大量的吊桿體系破壞實(shí)例中,常常是以短吊桿失效為主,或短吊桿首先發(fā)生失效。影響吊桿體系耐久性的原因是多方面的,如腐蝕、疲勞等因素。一般地,可以認(rèn)為同一拱橋上各吊桿所處的自然環(huán)境是相同的,長(zhǎng)短吊桿之間這種耐久性上的差異,主要是由于車(chē)輛荷載產(chǎn)生的動(dòng)力效應(yīng)不同而導(dǎo)致。因此,有必要通過(guò)詳盡的分析,研究拱橋吊桿體系的安全及耐久性問(wèn)題。本文在考慮車(chē)橋動(dòng)力耦合的基礎(chǔ)上,分析了吊桿體系尤其是短吊桿易于破壞的機(jī)理,深入研究了提高吊桿體系耐久性及保障吊桿體系安全性的設(shè)計(jì)方法。主要內(nèi)容如下:首先,建立車(chē)橋耦合動(dòng)力分析模型。分別建立了大跨度拱橋三維有限元結(jié)構(gòu)模型、空間多軸車(chē)輛模型和路面不平度模型并由三個(gè)模型組成車(chē)橋耦合動(dòng)力分析模型,進(jìn)行車(chē)橋耦合分析。通過(guò)橋梁靜動(dòng)態(tài)響應(yīng)的計(jì)算結(jié)果與橋梁荷載試驗(yàn)實(shí)測(cè)結(jié)果的比較,驗(yàn)證了所建立的拱橋動(dòng)力分析模型,保證了模型的可行性。其次,基于所建立的考慮車(chē)橋耦合的動(dòng)力分析模型,對(duì)吊桿體系的動(dòng)力響應(yīng)進(jìn)行分析。通過(guò)對(duì)吊桿應(yīng)力沖擊效應(yīng)、彎曲效應(yīng)的計(jì)算分析,研究了不同車(chē)速、車(chē)重、路面不平度以及車(chē)輛加速度對(duì)吊桿動(dòng)力響應(yīng)的影響。研究表明,車(chē)輛荷載對(duì)吊桿體系產(chǎn)生顯著的沖擊效應(yīng)和彎曲效應(yīng),進(jìn)而在吊桿截面產(chǎn)生較大的應(yīng)力變幅和明顯的不均勻應(yīng)力分布,使吊桿體系易于疲勞破壞。短吊桿截面應(yīng)力水平高于長(zhǎng)吊桿,受沖擊作用更為顯著,因而更易疲勞破壞。然后,基于本文所揭示的短吊桿更易疲勞破壞的工作機(jī)理,提出了吊桿體系的等剛度模型來(lái)提高吊桿體系的耐久性。通過(guò)調(diào)整吊桿體系軸向剛度來(lái)改善短吊桿在車(chē)輛荷載作用下的受力條件,提高短吊桿的抗沖擊性能,延長(zhǎng)短吊桿使用壽命,進(jìn)而提高整個(gè)吊桿體系的耐久性。同時(shí),基于實(shí)際監(jiān)測(cè)車(chē)流統(tǒng)計(jì)模型所建立的車(chē)速車(chē)重聯(lián)合分布模型,建立車(chē)流荷載并通過(guò)車(chē)流加載分析,對(duì)等剛度模型中吊桿體系的耐久性進(jìn)行了評(píng)估。最后,針對(duì)吊桿體系失效難以預(yù)測(cè)的問(wèn)題,通過(guò)增設(shè)預(yù)警吊桿,提出了具有預(yù)警與破損安全功能的新型雙吊桿體系模型�；谠撃Ｐ�,探討了面向疲勞壽命的體系設(shè)計(jì)方法。通過(guò)使用壽命設(shè)計(jì)使吊桿體系具備以下性能:(1)預(yù)警吊桿與工作吊桿具有經(jīng)濟(jì)合理的疲勞壽命差;(2)預(yù)警吊桿破損時(shí),保證工作吊桿的安全和整體結(jié)構(gòu)形態(tài)正常。從而提高了吊桿體系安全運(yùn)營(yíng)的可靠性。通過(guò)調(diào)整預(yù)警吊桿初始應(yīng)力來(lái)實(shí)現(xiàn)與工作吊桿之間的疲勞壽命差異。通過(guò)車(chē)流加載進(jìn)行疲勞壽命分析,對(duì)預(yù)警功能進(jìn)行了評(píng)價(jià)。在此基礎(chǔ)上研究了吊桿體系損傷程度對(duì)疲勞壽命差異的影響,進(jìn)一步評(píng)價(jià)了該吊桿體系模型的預(yù)警與破損安全性能。
[Abstract]:The arch structure is used more and more widely in the modern bridge construction, the bridge safety and durability problems have become increasingly prominent, which, in the lower arch bridge in the boom system problems are most significant. Many bridge collapse in recent years, mostly caused by the failure in the boom system study found that, in a large number of suspender system failure examples, often with short suspender failure, or failure reasons. First, short suspenders suspender system durability influence is in many aspects, such as corrosion, fatigue and other factors. In general, can be considered at the same arch bridge suspender's natural environment is the same, the durability of the difference between the length of the boom, is mainly due to the different dynamic effect of vehicle load have caused. Therefore, it is necessary through the detailed analysis of the security and durability of the arch bridge suspender system The problem. Considering the dynamic coupling on the analysis of the mechanism of short suspenders suspender system especially easy to destroy, in-depth study to improve the design method of suspender system durability and security suspender system security. The main contents are as follows: firstly, build a vehicle bridge coupling dynamic analysis model. The three-dimensional finite long span arch bridge element structure models are established, the multi axis vehicle space model and road roughness model and consist of three models of vehicle bridge coupling dynamic analysis model, coupled analysis. Through comparison of test results and the dynamic response of the bridge of Liang Jing bridge load test results, verify the dynamic analysis model of arch bridge is established, the model of the feasibility. Secondly, considering the dynamic analysis model of vehicle bridge coupling based on the dynamic response of the system, on the analysis of the impact stress of derrick Effect analysis and calculation of the bending effect of different speed, weight, and influence of road roughness and vehicle acceleration on the dynamic response of the boom. The study shows that the impact of vehicle load effect and the bending effect of suspender system, resulting in high stress amplitude and obviously uneven stress distribution in the cross section. The crane system is easy to fatigue damage. The short section of the stress level is higher than the long boom boom, the impact is more significant, so it is more easy to fatigue failure. Then, the working mechanism of short suspenders disclosed more easily fatigue failure based on the proposed boom system such as the stiffness model to improve the durability of the boom system. By adjusting the axial stiffness of the suspender system to improve the short suspenders under vehicle load stress condition, improve the anti shock performance of short suspenders, prolong the service life of short suspenders, and improve the whole The durability of the suspender system. At the same time, based on the actual monitoring of traffic statistics model of speed weight joint distribution model, the establishment of traffic load and traffic load through the analysis, the durability of the equivalence rigidity model of suspender system is evaluated. Finally, aiming at the failure of the suspender system is difficult to predict, by adding a warning boom, put forward a new type of double suspender system model of early warning and fail safe function. Based on this model, discusses the system design method for fatigue life. By using the life design of the suspender system have the following properties: (1) early warning and work with the fatigue life of derrick boom economic reasonable difference; (2) early warning of Suspender Damage, guarantee safety and overall structure work properly. Suspender improves reliability of suspender system safe operation. By adjusting the initial boom stress to achieve early warning and lifting The difference between rod fatigue life. The fatigue life is analyzed by using the traffic load, the warning function were evaluated. On the basis of the research on influence of suspender system damage on the fatigue life of the difference, further evaluation of the boom system model of early warning and safety can be damaged.

【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U448.22

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本文編號(hào)：1720546