本文選題：大跨連續(xù)剛構(gòu)橋 + 雙肢薄壁高墩　； 參考：《中南林業(yè)科技大學(xué)》2017年碩士論文

【摘要】：西部地區(qū),由于受到地形條件的限制,公路橋梁須跨越陡峭的峽谷,雙肢薄壁高墩大跨連續(xù)剛構(gòu)橋是深溝等復(fù)雜地形條件下的理想橋型。目前,國內(nèi)外學(xué)者對大跨連續(xù)剛構(gòu)橋開展了大量的研究,研究成果相對成熟,但對大跨連續(xù)剛構(gòu)橋雙肢薄壁高墩的擬靜力性能和抗推極限承載力的研究相對較少。本文以張家界太極溪特大橋主橋施工監(jiān)控為工程背景,以12#墩為研究對象,設(shè)計制作1:16的縮尺模型,對雙肢薄壁高墩的擬靜力性能和抗推極限承載力進(jìn)行試驗研究。其主要內(nèi)容如下:(1)以結(jié)構(gòu)模型試驗基本理論為基礎(chǔ),根據(jù)量綱分析法推導(dǎo)出集中荷載作用下,模型與原型相似的應(yīng)力、應(yīng)變、位移相似關(guān)系。以張家界太極溪特大橋主橋12#墩為研究對象制作試驗?zāi)Ｐ�。并根�?jù)試驗?zāi)康脑O(shè)計試驗加載方案、試驗荷載工況,以及測試斷面、測點布置和測試方案。(2)利用有限元分析軟件MIDAS/CIVIL2016對實橋進(jìn)行有限元分析,得出實橋墩在不同工況作用下墩底截面、墩橫系梁截面的應(yīng)變理論值,墩頂截面的位移理論值,所得到的應(yīng)變理論值和位移理論值與施工監(jiān)控的實測值作對比,得知墩底截面和墩橫系梁截面的應(yīng)變監(jiān)控實測值以及墩頂截面的位移監(jiān)控實測值均小于理論計算值,且監(jiān)控實測值與計算值變化趨勢基本一致。(3)根據(jù)實橋懸臂施工過程的實際受力工況設(shè)計模型墩的試驗加載工況,對模型墩進(jìn)行低周反復(fù)荷載試驗,并在試驗過程中觀測試件的裂縫開展情況及整個破壞模式。將有限元模型計算得到的理論數(shù)據(jù)與試驗數(shù)據(jù)以及試驗墩試驗數(shù)據(jù)與原橋墩監(jiān)測數(shù)據(jù)進(jìn)行對比。并且從破壞特征、滯回曲線、耗能性能、骨架曲線和剛度退化特性方面進(jìn)行分析,得知雙肢薄壁高墩的受力性能和破壞機理。(4)利用有限元軟件ANSYS建立空間有限元模型求解模型墩抗推極限承載力,并通過模型試驗對比分析,得知試驗墩抗推極限承載力的試驗值與計算值基本相一致,且誤差相對較小。將試驗墩計算結(jié)果與試驗結(jié)果進(jìn)行相似比還原,再與原橋橋墩計算結(jié)果進(jìn)行比較,發(fā)現(xiàn)其吻合度相對較高。(5)最后,綜合試驗數(shù)據(jù)和理論計算數(shù)據(jù)得出了結(jié)論,提出有待研究的問題。
[Abstract]:In western China, due to the limitation of terrain conditions, highway bridges have to cross steep canyons. Two-legged thin-walled high-pier long-span continuous rigid frame bridge is an ideal bridge type under complicated terrain such as deep ditches.At present, scholars at home and abroad have carried out a lot of research on long-span continuous rigid frame bridge, and the research results are relatively mature, but the research on quasi-static behavior and ultimate bearing capacity of two-leg thin-walled high-pier of long-span continuous rigid frame bridge is relatively few.In this paper, taking the construction monitoring and control of the main bridge of Taijixi Bridge in Zhangjiajie as the engineering background, taking the 12# pier as the research object, the 1:16 scale model is designed and made, and the quasi-static behavior and the ultimate bearing capacity of the double-leg thin-walled high pier are tested and studied.The main contents are as follows: (1) based on the basic theory of structural model test, the similarity of stress, strain and displacement between the model and the prototype under concentrated load is derived according to the dimensional analysis method.Taking the 12# pier of Taijixi Bridge in Zhangjiajie as the research object, the test model is made.According to the purpose of the test, the test loading scheme, test load condition, test section, measuring point arrangement and test plan are designed. The finite element analysis software MIDAS/CIVIL2016 is used to analyze the real bridge.Under different working conditions, the strain theory value of piers bottom section, the cross beam section of pier, the displacement theory value of pier top section, the theoretical strain theory value and displacement theory value are compared with the measured value of construction monitoring.The results show that the measured values of the bottom section of the pier and the cross section of the piers and the displacement monitoring of the section of the pier top are all smaller than the calculated values of the theoretical calculation.According to the actual load condition of the cantilever design model pier, the model pier is tested under low cycle repeated load, according to the experimental loading condition of the model pier, and the monitoring measured value is basically consistent with the change trend of the calculated value.The crack development and the whole failure mode of the specimen were observed during the test.The theoretical and experimental data obtained by finite element model calculation and the test data of test pier are compared with the monitoring data of the original bridge pier.The damage characteristics, hysteretic curves, energy dissipation properties, skeleton curves and stiffness degradation characteristics are analyzed.It is known that the mechanical behavior and failure mechanism of two-leg thin-walled high pier. (4) the finite element software ANSYS is used to establish the spatial finite element model to solve the ultimate bearing capacity of the model pier, and through the model test, the ultimate bearing capacity of the model pier is compared and analyzed.It is known that the test value of the ultimate bearing capacity of the test pier is basically consistent with the calculated value, and the error is relatively small.Comparing the calculated results of the test piers with those of the original bridge piers, it is found that the degree of coincidence is relatively high. Finally, the conclusion is obtained by synthesizing the experimental data and the theoretical calculation data.The problems to be studied are put forward.
【學(xué)位授予單位】：中南林業(yè)科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U448.23

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