本文選題：高墩大跨連續(xù)剛構(gòu)橋 + 自振特性　； 參考：《天津城建大學(xué)》2014年碩士論文

【摘要】：近年來，隨著我國高速公路建設(shè)向山區(qū)快速延伸，橋梁結(jié)構(gòu)跨度越來越大，橋墩也變得越來越高，多座橋梁跨度和橋墩高度均超出了現(xiàn)行抗震設(shè)計(jì)規(guī)范所適用的限值。目前高墩大跨度連續(xù)剛構(gòu)橋抗震設(shè)計(jì)主要還是參照規(guī)則橋梁進(jìn)行，因此，有必要開展對(duì)高墩大跨度連續(xù)剛構(gòu)橋地震響應(yīng)研究，以此來指導(dǎo)該類非規(guī)則橋梁抗震設(shè)計(jì)。 本文以城川河特大橋?yàn)檠芯繉?duì)象，針對(duì)高墩大跨連續(xù)剛構(gòu)橋進(jìn)行地震響應(yīng)分析，主要內(nèi)容如下： (1)利用Midas/Civil分析了高墩大跨連續(xù)剛構(gòu)橋自振特性，通過計(jì)算其自振頻率與振型，總結(jié)了其自振規(guī)律，并利用正交試驗(yàn)設(shè)計(jì)思想，，建立16個(gè)試驗(yàn)?zāi)Ｐ�，通過改變橋梁結(jié)構(gòu)設(shè)計(jì)參數(shù)（上部結(jié)構(gòu)邊中跨比、上部結(jié)構(gòu)梁底冪次、橋墩壁厚、橋墩間距）研究其對(duì)結(jié)構(gòu)自振特性影響。 (2)采用反應(yīng)譜分析法，對(duì)采用正交試驗(yàn)設(shè)計(jì)的16個(gè)橋梁模型進(jìn)行地震響應(yīng)分析，通過對(duì)結(jié)果的極差和方差分析，確定結(jié)構(gòu)設(shè)計(jì)參數(shù)對(duì)高墩大跨連續(xù)剛構(gòu)橋的敏感程度。 (3)采用線性時(shí)程分析法，對(duì)高墩大跨連續(xù)剛構(gòu)橋在不同地震波下各控制截面的位移和內(nèi)力進(jìn)行比較分析，選取各地震波作用下地震響應(yīng)結(jié)果中最大值，并將其結(jié)果與相應(yīng)的反應(yīng)譜分析結(jié)果比較，驗(yàn)證選取地震波是否滿足規(guī)范要求。 (4)考慮了行波效應(yīng)對(duì)城川河大橋的影響，并與一致激勵(lì)下結(jié)果進(jìn)行對(duì)比，總結(jié)了行波效應(yīng)下高墩大跨連續(xù)剛構(gòu)橋地震響應(yīng)的特點(diǎn)，并研究了行波效應(yīng)下橋墩壁厚變化時(shí)對(duì)該連續(xù)剛構(gòu)橋的影響程度。 (5)采用非線性時(shí)程分析法，考慮材料非線性，研究墩高對(duì)高墩大跨連續(xù)剛構(gòu)橋非線性地震響應(yīng)影響。
[Abstract]:In recent years, with the rapid extension of highway construction to mountainous areas in China, the span of bridge structure becomes larger and larger, and the pier becomes higher and higher. Many bridges span and pier height exceed the limits applicable to the current seismic design code.At present, the seismic design of long-span continuous rigid frame bridges with high piers is mainly carried out with reference to regular bridges. Therefore, it is necessary to study the seismic response of long-span continuous rigid frame bridges with high piers so as to guide the seismic design of this kind of irregular bridges.This paper takes Chengchuan River Bridge as the research object, carries on the seismic response analysis for the high-pier long-span continuous rigid frame bridge, the main content is as follows:1) the natural vibration characteristics of long-span continuous rigid frame bridges with high piers and long spans are analyzed by using Midas/Civil. By calculating their natural frequencies and modes, the natural vibration laws are summarized, and 16 test models are established by using the idea of orthogonal test design.By changing the design parameters of bridge (middle span ratio of superstructure, power of bottom of superstructure, thickness of pier wall and distance between piers), the influence of the parameters on the natural vibration characteristics of the structure is studied.The seismic response of 16 bridge models designed by orthogonal test is analyzed by using response spectrum analysis. The sensitivity of structural design parameters to continuous rigid frame bridges with high piers and long spans is determined by the analysis of the range and variance of the results.In this paper, the displacement and internal force of the control section of the continuous rigid frame bridge with high piers and long span under different seismic waves are compared and analyzed by linear time-history analysis, and the maximum value of the seismic response results under the action of each seismic wave is selected.The results are compared with the corresponding response spectrum analysis results to verify whether the selected seismic waves meet the requirements of the code.(4) considering the effect of traveling wave effect on Chengchuan River Bridge, and comparing with the results under uniform excitation, the characteristics of seismic response of long-span continuous rigid frame bridge with high piers under traveling wave effect are summarized.The influence of pier wall thickness on the continuous rigid frame bridge is also studied.The influence of pier height on nonlinear seismic response of long-span continuous rigid frame bridge with high piers is studied by using nonlinear time-history analysis method and considering material nonlinearity.
【學(xué)位授予單位】：天津城建大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U442.55

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