【摘要】：吊桿作為中、下承式拱橋的關(guān)鍵構(gòu)件,其重要性顯而易見,而由于各種不確定因素的存在導(dǎo)致吊桿很可能會提前斷裂,但現(xiàn)行的吊桿設(shè)計理論對吊桿驟斷時拱橋的安全性考慮不足,且現(xiàn)有的理論與技術(shù)手段無法準(zhǔn)確的判斷吊桿何時斷裂,因此吊桿突然斷裂導(dǎo)致橋梁損毀的事故時有發(fā)生。為此,針對單吊桿系統(tǒng)拱橋,本文基于已有的研究進行拱橋吊桿斷裂時的動力響應(yīng)分析,并提出預(yù)防拱橋吊桿突然斷裂的對策方法,對吊桿破損安全設(shè)計進行分析研究,旨在實現(xiàn)拱橋不會因吊桿突然斷裂而坍塌,且能保證拱橋正常運營并給橋梁提供足夠的修復(fù)時間。本文結(jié)合一中承式鋼管混凝土拱橋,研究吊桿斷裂對拱橋的影響,探討分析單吊桿系統(tǒng)的破損安全設(shè)計方法。主要研究內(nèi)容為:(1)總結(jié)引起吊桿斷裂的原因及相關(guān)對策,分析了拱橋吊桿破損安全的研究現(xiàn)狀,明確了進行吊桿破損安全設(shè)計的目的及意義。(2)綜述了破損安全理論和破損安全結(jié)構(gòu)的實現(xiàn)途徑,基于多路傳力的思想提出了兩類針對單吊桿系統(tǒng)的吊桿破損安全設(shè)計方法,并將其應(yīng)用到現(xiàn)有拱橋上進行研究。(3)運用半動力模擬方法模擬吊桿斷裂時拱橋的響應(yīng),分析短吊桿與長吊桿斷裂對拱橋的沖擊作用,研究普通單吊桿系統(tǒng)拱橋吊桿斷裂時的安全性,得出吊桿斷裂時拱橋受力不利的地方,結(jié)果表明吊桿斷裂可能會引起拱橋縱橫梁連接失效導(dǎo)致橋梁損毀。(4)對單吊桿系統(tǒng)進行改造,將改造后的破損安全系統(tǒng)應(yīng)用到茅草街大橋上,建模分析具有破損安全吊桿系統(tǒng)的拱橋的安全性能,分析結(jié)果表明改造后的破損安全吊桿系統(tǒng)能有效地提高拱橋的安全性能,證明了吊桿破損安全設(shè)計原理的合理性。(5)探討了單吊桿系統(tǒng)破損安全的合理設(shè)計方法,所得的結(jié)論為設(shè)計人員進行單吊桿系統(tǒng)拱橋的吊桿破損安全設(shè)計提供了一定的參考價值。
[Abstract]:As the key component of the through arch bridge, the importance of the suspension rod is obvious, and because of the existence of various uncertain factors, it is likely to break ahead of time. However, the current design theory of suspenders has insufficient consideration for the safety of arch bridges when the suspenders break suddenly, and the existing theories and technical means cannot accurately judge when the suspenders break, so the accidents of the sudden rupture of the suspenders lead to the damage of the bridges from time to time. For this reason, based on the existing research, this paper analyzes the dynamic response of arch bridge suspenders when they break, and puts forward the countermeasures to prevent the sudden rupture of arch bridge suspenders, and analyzes and studies the safety design of suspenders' breakage. The purpose of this paper is to ensure that the arch bridge will not collapse because of the sudden rupture of the suspenders, and that the arch bridge can be operated normally and provide enough repair time for the bridge. In this paper, the influence of the break of suspenders on the arch bridge is studied, and the design method of the damage safety of single suspension system is discussed in combination with a middle through concrete filled steel tube arch bridge. The main research contents are as follows: (1) summarize the causes of the rupture of the suspenders and the relevant countermeasures, and analyze the current research situation of the safety and damage of the suspenders of the arch bridge. The purpose and significance of the design of the damaged safety of the suspension rod are clarified. (2) the theory of damage safety and the way to realize the damaged safety structure are summarized. Based on the idea of multi-channel force transfer, two kinds of safety design methods for single suspender system are proposed and applied to the existing arch bridge. (3) the response of arch bridge when the suspension is broken is simulated by semi-dynamic simulation method. This paper analyzes the impact of short and long suspenders on the arch bridge, studies the security of the common single suspension system when the arch bridge is broken, and draws the conclusion that the arch bridge is unfavorable to the force when the suspender is broken. The results show that the fracture of suspenders may lead to the failure of longitudinal and transverse beam connections of arch bridges and lead to bridge damage. (4) the single suspension system is reformed and the damaged safety system is applied to the Maocaojie Bridge. The safety performance of the arch bridge with damaged safety suspension system is analyzed. The analysis results show that the improved damaged safety suspension system can effectively improve the safety performance of the arch bridge. This paper proves the rationality of the design principle of the damage safety of the suspension rod. (5) the reasonable design method of the breakage safety of the single boom system is discussed. The conclusion provides a certain reference value for designers to design the damaged safety of single suspension system arch bridge.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U448.22

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