本文選題：路橋過渡段　切入點：差異沉降　出處：《湖南大學》2015年碩士論文　論文類型：學位論文

【摘要】：路橋過渡段普遍存在的差異沉降以及橋頭經常破損的伸縮縫均可統(tǒng)稱為橋頭路橋不平順,二者均會加劇過往車輛的振動,影響行駛安全,降低乘坐者舒適感,放大車輛對橋頭的局部沖擊作用,進而加速橋頭伸縮縫,橋面板等構件的破損,形成惡性循環(huán)。研究表明,橋面板承受的跳車沖擊荷載可能高達靜荷載的5-6倍,而且在伸縮縫破損的影響下,橋面板設計應取決于伸縮縫附近的橋面板局部響應。因此,很有必要研究橋頭路橋不平順對橋面板的局部沖擊作用,而目前鮮有學者關注此問題。橋梁設計規(guī)范采用基于橋梁整體響應(如跨中撓度)確定的沖擊系數來衡量橋面板所受的局部沖擊,而此沖擊系數對控制內力為橫向彎矩的橋面板可能并不適用。此外,國內外均尚未有統(tǒng)一的差異沉降控制標準。學者們主要通過調查行車舒適度提出各自的控制標準,缺乏全面地從人,車,橋三方面振動對差異沉降提出更合理的控制標準。對此,本研究建立了車—路—橋系統(tǒng)振動模型,首先研究了伸縮縫破損狀態(tài)對橋面板的局部沖擊系數(基于橋面板的橫向彎矩計算)和橋梁整體的沖擊系數(基于橋梁整體響應計算)的影響。結果表明伸縮縫的破損會造成局部沖擊系數明顯增大,而對整體沖擊系數基本無影響。之后,研究了路橋過渡段差異沉降對人、車、橋三方面的影響,即對乘坐者舒適度,車輛行駛安全以及橋梁的沖擊作用,包括橋面板的局部沖擊系數和橋梁整體的沖擊系數三種指標的影響。最后,參照規(guī)范對上述指標的建議值,提出了合理的差異沉降控制量。
[Abstract]:The common differential settlement in the transitional section of the road and bridge, as well as the often damaged expansion joint at the bridge head, can all be called the bridge road and bridge irregularity, both of which will aggravate the vibration of the passing vehicle, affect the driving safety and reduce the comfort of the rider. The local impact of vehicle on the bridge head is magnified, and then the damage of the bridge head expansion joint, bridge deck plate and other components is accelerated, which forms a vicious circle. The research shows that the impact load of the bridge deck board may be 5-6 times of the static load. Under the influence of expansion joint damage, the design of bridge deck should depend on the local response of the bridge deck near the expansion joint. Therefore, it is necessary to study the local impact of the bridge deck on the bridge deck caused by the bridge roadway irregularity. At present, few scholars pay attention to this problem. The bridge design code uses the impact coefficient based on the overall response of the bridge (such as mid-span deflection) to measure the local impact of the bridge deck. The impact coefficient may not be applicable to the bridge deck with lateral bending moment. In addition, there is no uniform standard for differential settlement control at home and abroad. Scholars mainly put forward their own control standards through investigation of driving comfort. In this paper, the vibration model of vehicle-road-bridge system is established, which is lack of a more reasonable control standard for differential settlement from three aspects of human, vehicle and bridge. Firstly, the influence of the damaged state of expansion joint on the local impact coefficient (based on the transverse moment calculation of the deck slab) and the overall impact coefficient of the bridge (based on the calculation of the bridge overall response) is studied. The results show that the expansion joint is affected by the calculation of the overall response of the bridge. The local impact coefficient will increase obviously due to the breakage. After that, the effects of differential settlement on human, vehicle and bridge are studied, that is, the comfort of the rider, the safety of the vehicle and the impact of the bridge. The influence of the local impact coefficient of bridge deck and the impact coefficient of the whole bridge is included. Finally, the reasonable differential settlement control amount is put forward with reference to the suggested values of the above indexes in the code.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441.3

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