發(fā)布時間：2018-06-27 08:24

  本文選題：滾石 + 橋墩��； 參考：《重慶交通大學》2015年碩士論文

【摘要】：鑒于近年來我國頻頻發(fā)生橋梁受滾石撞擊的事故,造成的人員傷亡、財產(chǎn)損失以及環(huán)境破壞是不可估量。而《公路橋涵公用設計規(guī)范》對于山區(qū)橋梁受滾石撞擊這種偶然作用并未給出一定的設計建議。且我國的《鐵路隧道設計規(guī)范》和《公路隧道設計規(guī)范》中雖然提及了有關明洞和棚洞設計荷載有關經(jīng)驗計算參照方法,但沒有給出滾石的計算力公式。由此可見,對于滾石災害目前在我國公路橋梁領域并未受到重視。正是基于以上背景,本文做了以下主要研究內(nèi)容:①利用相似理論分析了縮尺試驗構件尺寸和使用的材料,進行縮尺滾石—橋墩試驗研究,分析橋墩在撞擊過程中橋墩的動力響應的及出現(xiàn)的損傷形態(tài),從試驗角度反映橋梁下部結構受到外部碰撞力出現(xiàn)的動力響應和響應過程以及研究橋墩損傷破壞的影響因素。②對數(shù)值模擬中常用的動力作用下的混凝土材料模型進行了詳細的介紹和比較,并通過建立有限元模型,分析比較了蓋帽模型、HJC模型和線彈性三種常用的材料模型的計算結果,最終選擇了HJC材料模型作為本文建模中混凝土的材料模型。③通過建立滾石和橋墩有限元模型,仿真分析橋墩在滾石撞擊下整個動態(tài)過程,獲取動力響應的幾個指標:撞擊力時程曲線、橋墩位移時程曲線、加速度時程曲線、橋墩應力時程曲線以及橋墩損傷情況。④分析影響橋墩損傷的主要因素,研究滾石形狀對橋墩破壞形態(tài)的影響,研究從局部損傷開展到整體破壞的演化過程,分析橋墩局部損傷與整體破壞之間的聯(lián)系。
[Abstract]:In view of the frequent accidents caused by rolling stones in China in recent years, the casualties, property losses and environmental damage caused by the accidents are inestimable. However, the Code for the Design of Highway Bridges and culverts has not given some design suggestions for the accidental action of rolling stones on bridges in mountainous areas. In our country's Railway Tunnel Design Code and Highway Tunnel Design Code, although the empirical calculation reference method related to the design load of open tunnel and shed tunnel is mentioned, the calculation force formula of rolling stone is not given. It can be seen that the rolling stone disaster has not been paid attention to in the field of highway and bridge in our country. Based on the above background, this paper does the following main research contents: 1. By using the similarity theory, the dimensions and materials of the scale test members are analyzed, and the scale rolling stone pier test research is carried out. The dynamic response and damage pattern of pier during impact are analyzed. From the point of view of test, the dynamic response and response process of bridge understructure subjected to external impact force are reflected, and the influencing factors of damage and failure of pier are studied. 2. 2. Concrete material modulus under the common dynamic action in numerical simulation. Type B is introduced and compared in detail. By establishing the finite element model, the calculation results of the HJC model and the linear elastic model are analyzed and compared. Finally, HJC material model is chosen as the material model of concrete in this paper. 3. By establishing the finite element model of rolling stone and bridge pier, the whole dynamic process of bridge pier under the impact of rolling stone is simulated and analyzed. Several indexes of dynamic response are obtained: impact force time-history curve, pier displacement time-history curve, acceleration time-history curve, pier stress time-history curve and pier damage situation. 4. The main factors affecting pier damage are analyzed. This paper studies the influence of rolling stone shape on the failure pattern of bridge pier, studies the evolution process from local damage to global failure, and analyzes the relationship between local damage and global failure of bridge pier.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U443.22;U441.3

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本文編號：2073299