發(fā)布時間：2018-05-29 23:23

  本文選題：橋梁工程 + 混合梁��； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：本文以甌江大橋?yàn)楣こ瘫尘?建立1：16的縮尺模型,通過模型試驗(yàn)對該橋的承載性能進(jìn)行了研究。試驗(yàn)獲取了試驗(yàn)橋梁的變形特性、應(yīng)力發(fā)展規(guī)律及裂縫發(fā)展規(guī)律,并對混合梁剛構(gòu)橋模型的受力特性、承載能力、破壞形態(tài)等進(jìn)行了深入的研究,最后利用有限元對模型試驗(yàn)的彈性工況進(jìn)行數(shù)值模擬,對比試驗(yàn)結(jié)果,得出了如下主要研究結(jié)論： (1)1.4倍活載作用下,橋梁關(guān)鍵截面位置的變形和內(nèi)力均能夠恢復(fù)到初始加載狀態(tài),混合梁整體處于彈性工作狀態(tài)；橋梁在加載至1.4倍活荷載后,依舊能夠繼續(xù)承載,并維持其彈性工作狀態(tài),橋梁擁有相當(dāng)?shù)陌踩珒洹?(2)彈性工況下,有限元軟件Midas和ABAQUS對模型橋、實(shí)橋仿真分析結(jié)果與試驗(yàn)結(jié)果相差不大,說明利用有限元軟件進(jìn)行仿真分析的結(jié)果有效可靠。 (3)1倍汽車荷載和1.4倍汽車荷載加載時,有限元仿真分析和試驗(yàn)的主要變形和應(yīng)變結(jié)果皆小于設(shè)計(jì)計(jì)算出的變形和應(yīng)變,說明按規(guī)范設(shè)計(jì)的橋梁存有相當(dāng)?shù)陌踩珒洹?(4)破壞工況試驗(yàn)中,約5.85倍的活荷載作用下,結(jié)構(gòu)仍舊處于彈性工作狀態(tài)；隨著荷載的繼續(xù)增加直至結(jié)構(gòu)達(dá)到極限狀態(tài),結(jié)構(gòu)共能承載大約12.68倍的汽車活載作用,擁有充分的安全儲備。 (5)總結(jié)了混合梁剛構(gòu)橋模型的受力控制截面、變形特性、應(yīng)力發(fā)展規(guī)律、裂縫發(fā)展及分布規(guī)律以及最終的破壞失效形式。
[Abstract]:Taking Oujiang Bridge as the engineering background, the 1:16 scale model is established in this paper, and the bearing capacity of the bridge is studied by model test. The deformation characteristic, stress development law and crack development law of the test bridge are obtained by the test. The stress characteristics, bearing capacity and failure form of the model of the hybrid beam rigid frame bridge are studied deeply. Finally, the numerical simulation of the elastic condition of the model test is carried out by using finite element method, and the main research conclusions are obtained by comparing the test results. Under the action of 1.4 times live load, the deformation and internal force of the key section of the bridge can be restored to the initial loading state, the hybrid beam is in an elastic working state, and the bridge can still carry load after loading to 1.4 times live load. And maintain its flexible working state, the bridge has a considerable safety reserve. 2) under the elastic condition, the simulation results of the real bridge with the finite element software Midas and ABAQUS are not much different from the experimental results, which shows that the simulation analysis by using the finite element software is effective and reliable. The main deformation and strain results of finite element simulation analysis and test are smaller than those of design and calculation, which shows that the bridges designed according to the specifications have a considerable safety reserve. 4) in the failure condition test, the structure is still in elastic working state under the action of about 5.85 times of live load, and with the increase of load until the structure reaches the limit state, the structure can carry about 12.68 times of the live load of the automobile. Have sufficient safety reserves. The stress control section, deformation characteristic, stress development law, crack development and distribution law and ultimate failure mode of hybrid beam rigid frame bridge model are summarized.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U446;U448.23

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 盧桂臣;鄒宏華;;混合式斜拉橋鋼混接合段的優(yōu)化研究[J];中外公路;2006年03期

2 胡建華;陳冠雄;向建軍;劉榕;;平勝大橋設(shè)計(jì)構(gòu)思與創(chuàng)新技術(shù)[J];橋梁建設(shè);2006年02期

，

本文編號：1952879