【摘要】：隨著我國河運和海運交通的快速發(fā)展,船橋相撞事故在近年越來越多,之前船撞領(lǐng)域大多是在撞擊力方面進行研究,而對與船橋相撞后橋梁的損傷程度的研究較少,甚至是一片空白,所以提出一個合理的損傷指標(biāo)是目前船撞領(lǐng)域亟待解決的問題。本文正是在此背景下,結(jié)合抗震領(lǐng)域,車撞領(lǐng)域及抗風(fēng)領(lǐng)域的研究成果,以大量的仿真數(shù)據(jù)及試驗研究,提出以墩底轉(zhuǎn)角作為損傷指標(biāo)來界定混凝土矩形橋墩在受到船舶撞擊后的五種損傷狀態(tài)。本研究主要開展的研究工作如下:①利用數(shù)值仿真計算方法,模擬了縮放后試驗擺錘,混凝土橋墩在五種工況下的撞擊情形,按照相同的撞擊點,不同的撞擊速度觀察混凝土矩形橋墩中鋼筋軸力,墩頂位移以及墩底混凝土的開裂情況,以此為依據(jù),將墩底轉(zhuǎn)角作為判斷混凝土橋墩損傷等級的指標(biāo)。②對提出的損傷指標(biāo)進行試驗驗證,以單擺裝置為依托,不同工況下提取擺錘不同的豎向高度以獲得不同的撞擊速度,由應(yīng)變片來測取鋼筋和混凝土的狀態(tài),拉線位移傳感器測取墩頂位移,同時將試驗數(shù)據(jù)與仿真數(shù)據(jù)對比分析,最終得出判斷混凝土矩形橋墩損傷等級的第一臨界轉(zhuǎn)角Δ_s=1/5ε_0/ζ_yh_0H和第二臨界轉(zhuǎn)角Δ_d=2/3ε_0/ζ_yh_0H。③以工況五中橋墩的最終破壞形式判斷,橋墩在受到較大的沖擊荷載作用下其最終的破壞形式為脆性破壞。最后,本文對船撞碰撞研究領(lǐng)域進行了展望,對其中損傷指標(biāo)以及本文部分成果尚需進一步研究的內(nèi)容進行總結(jié)。
[Abstract]:With the rapid development of river and sea transportation in our country, there are more and more collision accidents between ships and bridges in recent years. Before that, most of the research on collision force was carried out in the field of ship collision, but the research on the damage degree of bridge after collision with ship bridge was less. Even a blank, so it is urgent to put forward a reasonable damage index in the field of ship collision. Under this background, combined with the research results in the field of earthquake resistance, vehicle collision and wind resistance, this paper uses a large number of simulation data and experimental research. Five damage states of concrete rectangular bridge pier after impact by ship are defined by the angle of the bottom of the pier as the damage index. The main research work of this study is as follows: 1 by using the numerical simulation method, the paper simulates the impact of the scaled test pendulum and the concrete pier under five working conditions, according to the same impact point. The axial force of steel bar, the displacement of the pier top and the cracking of concrete at the bottom of the pier are observed with different impingement velocities. The bottom rotation angle of the pier is taken as the index to judge the damage grade of concrete pier. 2 the damage index is tested and verified. Based on the single pendulum device, different vertical height of the pendulum hammer is extracted under different working conditions to obtain different impact velocity. The state of steel bar and concrete is measured by strain gauge, and the displacement of pier top is measured by wire displacement sensor. At the same time, the test data and simulation data are compared and analyzed. Finally, the first critical angle 螖 _ sn 1 / 5 蔚 _ 0 / 味 _ yh_0H and the second critical angle 螖 _ dn _ 2 / 3 蔚 _ 0 / 味 _ yh_0H.3 are obtained to judge the damage grade of concrete rectangular pier. The ultimate failure form of pier subjected to large impact load is brittle failure. Finally, this paper looks forward to the research field of ship collision, and summarizes the damage index and some achievements of this paper.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441;U443.22

【參考文獻】

相關(guān)期刊論文 前1條

1 蔡敏;張飛帆;;船舶撞擊橋梁后的結(jié)構(gòu)損傷分析[J];浙江水利水電專科學(xué)校學(xué)報;2007年04期

相關(guān)博士學(xué)位論文 前1條

1 陶清林;型鋼高強混凝土框架結(jié)構(gòu)多尺度力學(xué)性能研究[D];西安建筑科技大學(xué);2013年

，

本文編號：2396435