本文關(guān)鍵詞：考慮支座性能的高鐵連續(xù)梁橋地震響應(yīng)分析　出處：《北京交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 連續(xù)梁橋 屈服指標(biāo) 支座本構(gòu) 阻尼參數(shù)

【摘要】：我國高速鐵路發(fā)展過程中,橋梁所占線路里程比例較高。現(xiàn)行2009版《鐵路工程抗震設(shè)計規(guī)范》中動力放大系數(shù)最大值βmax取值低于2015版《中國地震動參數(shù)區(qū)劃圖》中取值,支座損傷概率和支座性能對橋梁結(jié)構(gòu)抗震性能的影響等方面工作仍有待繼續(xù)深入。針對上述情況,本文依托國家自然科學(xué)基金重點項目(No.U1434210):高速鐵路地震預(yù)警理論與方法研究,分析高鐵連續(xù)梁橋的地震響應(yīng),研究在阻尼滯變參數(shù)與屈服指數(shù)改變下,支座性能變化對支座及橋墩地震響應(yīng)的影響,驗證了粘滯阻尼器的減震效果。本文的主要研究內(nèi)容如下:(1)對國內(nèi)外抗震規(guī)范和支座性能與橋梁地震響應(yīng)的研究現(xiàn)狀進(jìn)行回顧和歸納,明確本文要研究的內(nèi)容。(2)總結(jié)了高鐵橋梁建模時材料的本構(gòu)模型;對我國鐵路抗震規(guī)范及國內(nèi)其他抗震規(guī)范的設(shè)防標(biāo)準(zhǔn)進(jìn)行了比較研究;對場地劃分進(jìn)行對比并基于場地類型選取相應(yīng)地震波;建立了“六彈簧”樁—土相互作用模型。(3)以典型的40m+64m+40m三跨連續(xù)梁橋為例,針對不同軸壓比和縱筋率,基于截面分析軟件Xtract建立主墩墩底截面模型并進(jìn)行彎矩曲率分析。基于有限元分析軟件Midas/civil建立連續(xù)梁橋全橋模型,分別計算了三水準(zhǔn)地震作用下縱、橫橋向動力響應(yīng)。結(jié)果表明,隨著軸壓比和縱筋率增加,橋墩截面屈服彎矩逐漸增大,同時延性下降;縱向墩底彎矩和橫向墩頂位移在罕遇地震下接近屈服值。(4)通過改變阻尼滯變參數(shù)與屈服指數(shù),分析支座本構(gòu)關(guān)系變化對支座與橋墩地震響應(yīng)的影響。研究表明,改變阻尼滯變參數(shù)對結(jié)構(gòu)基于位移的屈服指標(biāo)影響較大,但在支座模擬中,屈服指數(shù)往往設(shè)置為無窮大,而這對支座縱橋向抗震能力過于理想,橫橋向抗震能力過于保守。組合使用不同類型支座,研究不同支座配置下墩底剪力、墩底彎矩與墩頂位移的變化規(guī)律,探究支座的最優(yōu)化配置。(5)探究粘滯阻尼器對高鐵連續(xù)梁橋動力響應(yīng)的影響,得到針對本文結(jié)構(gòu)的推薦阻尼參數(shù),驗證了粘滯阻尼器能顯著提高結(jié)構(gòu)抗震性能。通過連續(xù)梁橋的有限元模型數(shù)值模擬,探究了支座與橋墩響應(yīng)的相關(guān)性,驗證粘滯阻尼器的減震效果,為連續(xù)梁橋的服役安全以及抗震設(shè)計的發(fā)展提供了技術(shù)支撐。
[Abstract]:In the process of high-speed railway development in China. The maximum value of dynamic magnification factor 尾 max in the current edition 2009 < Code for Seismic Design of Railway Engineering > is lower than that in the 2015 edition of "China Seismic parameters Zoning Map". . The damage probability of support and the effect of bearing performance on seismic performance of bridge structure need to be further studied. Based on the research of earthquake warning theory and method of high-speed railway, the earthquake response of high-speed continuous beam bridge is analyzed by relying on the key item of National Natural Science Foundation No. No. U1434210. Under the change of damping hysteretic parameter and yield index, the effect of bearing performance change on the seismic response of bearing and pier is studied. The main contents of this paper are as follows: (1) the research status of seismic code, bearing performance and bridge seismic response at home and abroad are reviewed and summarized. (2) the constitutive model of materials used in high-speed railway bridge modeling is summarized. A comparative study is made on the fortification standards of China's railway seismic code and other domestic aseismic codes. The site division is compared and the corresponding seismic waves are selected based on the site type. A "six-spring" pile-soil interaction model is established. Taking a typical 40m 64m 40m three-span continuous beam bridge as an example, different axial compression ratios and longitudinal reinforcement ratios are considered. Based on section analysis software Xtract, the section model of main pier bottom and bending moment curvature analysis are established. Based on the finite element analysis software Midas/civil, the whole bridge model of continuous beam bridge is established. The dynamic responses of longitudinal and transverse bridges under the action of three leveling earthquakes are calculated respectively. The results show that with the increase of axial compression ratio and longitudinal reinforcement ratio, the yield moment of piers increases gradually and the ductility decreases. The bending moment of longitudinal pier bottom and the displacement of transverse pier top are close to yield value. 4) by changing damping hysteretic parameter and yield index. The influence of the change of bearing constitutive relation on the seismic response of support and pier is analyzed. The results show that the change of damping hysteretic parameters has great influence on the yield index based on displacement, but in the support simulation. The yield index is often set to infinity, which is too ideal for the seismic capacity of the longitudinal bridge and too conservative for the transverse bridge. Combined with different types of supports, the shear force at the bottom of the pier is studied with different support configurations. The influence of viscous dampers on the dynamic response of high-speed continuous beam bridges is investigated, and the recommended damping parameters for this structure are obtained. It is verified that the viscous damper can improve the seismic performance of the structure significantly. Through the finite element model numerical simulation of continuous beam bridge, the correlation between the support and the pier response is explored, and the damping effect of the viscous damper is verified. It provides technical support for the service safety of continuous beam bridge and the development of seismic design.
【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】：2017
【分類號】：U442.55

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