【摘要】：小半徑曲線梁橋被較多地應(yīng)用于城市立交橋和高速公路立交橋等建設(shè)中,汶川地震中回瀾立交橋?yàn)榈湫偷男“霃角�梁橋,其嚴(yán)重破壞引起了許多學(xué)者的關(guān)注。本文以回瀾立交橋震害為工程背景,在以往學(xué)者研究的基礎(chǔ)上應(yīng)用OpenSees分析平臺,采用非線性時(shí)程分析方法,研究該橋的地震響應(yīng)及震害情況。為準(zhǔn)確模擬橋墩的彎剪破壞反應(yīng),完成了含彎剪破壞的12組鋼筋混凝土橋墩擬靜力試驗(yàn)與4組鋼筋混凝土橋墩振動臺試驗(yàn)的數(shù)值模擬,在此基礎(chǔ)上確立了 OpenSees分析平臺考慮橋墩剪切效應(yīng)的建模思路。論文主要工作及進(jìn)展如下:(1)闡述了曲線梁橋震害和抗震研究歷史,介紹了 OpenSees分析平臺彎剪破壞橋墩數(shù)值分析模型的研究現(xiàn)狀。(2)基于OpenSees開放式平臺,分別基于Elwood模型與Leborgne模型建立了考慮彎剪破壞的鋼筋混凝土橋墩數(shù)值分析模型。通過12組彎剪破壞的鋼筋混凝土橋墩擬靜力試驗(yàn)數(shù)值分析,發(fā)現(xiàn)Elwood模型與試驗(yàn)結(jié)果偏差較大,可能與其參數(shù)估計(jì)公式離散性較大有關(guān);若通過試驗(yàn)結(jié)果識別出相關(guān)參數(shù),則Elwood模型能較準(zhǔn)確模擬橋墩的滯回性能。Leborgne模型相對而言較準(zhǔn)確的模擬了彎剪破壞橋墩的滯回曲線。(3)通過2組彎曲破壞橋墩和2組彎剪破壞橋墩振動臺試驗(yàn)數(shù)值模擬,提出采用Leborgne模型通過數(shù)值擬靜力試驗(yàn)準(zhǔn)備及識別橋墩的滯回性能參數(shù),再通過Elwood模型完成橋墩的非線性時(shí)程分析的方法,以實(shí)現(xiàn)彎剪破壞橋墩的時(shí)間過程分析。彎剪破壞橋墩振動臺試驗(yàn)結(jié)果初步驗(yàn)證了上述方法的可行性。(4)基于OpenSees開放式平臺,考慮橋墩彎剪破壞、支座滑移及脫空因素,建立了回瀾立交橋D匝道橋非線性地震反應(yīng)分析模型,通過輸入含汶川地震在內(nèi)的5組合適地震波,討論了其地震反應(yīng)及特征。研究發(fā)現(xiàn)在不同地震波下最矮2號橋墩(固接)幾乎都發(fā)生屈服及進(jìn)入塑性,當(dāng)考慮橋墩剪切破壞時(shí),最矮2號橋墩(固接)達(dá)到剪切破壞點(diǎn)后,隨墩頂位移延性發(fā)展橋墩承載力有下降的趨勢,彎剪破壞特征顯現(xiàn)。分析中橋梁支座大都發(fā)生了滑移反應(yīng),與震害現(xiàn)象一致,豎向地震波對橋臺與交界墩處支座影響較大,但僅El Centro地震波下交界墩處支座有脫空現(xiàn)象。
[Abstract]:Small radius curved girder bridges are widely used in the construction of urban flyovers and highway overpasses. Huilan overpass in Wenchuan earthquake is a typical small radius curved girder bridge, which has been seriously damaged by many scholars. Taking the earthquake disaster of Huilan overpass as the engineering background, using the OpenSees analysis platform and the nonlinear time-history analysis method, the earthquake response and earthquake damage of the bridge are studied in this paper. In order to accurately simulate the flexural shear failure response of the pier, 12 groups of pseudo-static tests of reinforced concrete pier with flexural shear failure and 4 groups of shaking table tests of reinforced concrete pier were completed. On this basis, the OpenSees analysis platform considering the shear effect of bridge pier is established. The main work and progress in this paper are as follows: (1) the history of seismic damage and seismic research of curved girder bridges is described, and the research status of numerical analysis model of bending and shear failure pier based on OpenSees analysis platform is introduced. (2) based on OpenSees open platform, Based on Elwood model and Leborgne model, the numerical analysis model of reinforced concrete pier considering flexural shear failure is established. Through the numerical analysis of 12 groups of reinforced concrete piers subjected to bending and shear failure, it is found that the deviation between Elwood model and test results is large, which may be related to the discreteness of parameter estimation formula. If the relevant parameters are identified from the test results, The Elwood model can accurately simulate the hysteretic performance of the pier. The Leborgne model can simulate the hysteretic curve of the flexural shear failure pier relatively accurately. (3) through two groups of flexural failure piers and two groups of flexural shear failure pier shaking table test numerical simulation. Leborgne model is used to prepare and identify the hysteretic performance parameters of pier by numerical pseudo-static test, and then the nonlinear time-history analysis method of pier is completed by Elwood model, so as to realize the time process analysis of pier subjected to bending and shear failure. The results of the shaking table test of the flexural shear failure bridge pier prove the feasibility of the above method. (4) based on the OpenSees open platform, the factors of pier bending shear failure, bearing slip and void removal are considered. A nonlinear seismic response analysis model for D-ramp bridge of Huilan overpass is established. The seismic response and its characteristics are discussed by inputting 5 groups of suitable seismic waves including Wenchuan earthquake. It is found that under different seismic waves, the shortest pier of No. 2 bridge (fixed joint) almost succumbs and enters plasticity. When considering the shear failure of pier, the shortest pier of No. 2 bridge (fixed joint) reaches the shear failure point. With the development of the ductility of the pier top, the bearing capacity of the pier decreases, and the characteristics of bending and shear failure appear. In the analysis, most of the bridge supports have slippage reaction, which is consistent with the earthquake damage phenomenon. The vertical seismic wave has a great influence on the support at the abutment and the junction pier, but only the support at the junction pier under the El Centro seismic wave has the phenomenon of void.
【學(xué)位授予單位】：大連海事大學(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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