【摘要】：作為新型的鋼-混復(fù)合結(jié)構(gòu),波形鋼腹板PC組合箱梁橋完美的詮釋了鋼混組合結(jié)構(gòu)的優(yōu)良性能,腹板的波折形狀與普通混凝土箱梁結(jié)構(gòu)腹板相比,橋梁上部結(jié)構(gòu)重量明顯減小,也降低了下部結(jié)構(gòu)的承重[1]。同時(shí)還具有較高的預(yù)應(yīng)力效率、較短的施工周期和美觀(guān)的外形等優(yōu)勢(shì),在法國(guó)等歐洲國(guó)家發(fā)展尤其迅速,在日本也得到很好的應(yīng)用與研究。目前,該類(lèi)型的橋梁具有很好的實(shí)用性和發(fā)展前景,它的應(yīng)用逐步由簡(jiǎn)支等截面箱梁向變截面大跨度連續(xù)鋼構(gòu)體系發(fā)展,結(jié)構(gòu)更加美觀(guān),承載力也逐步加強(qiáng)[2]�，F(xiàn)有的研究主要是分析該種結(jié)構(gòu)的波形腹板在橋梁的抗彎能力、抗剪切能力及抗扭能力等方面的貢獻(xiàn),波形鋼腹板橋梁的有限元分析大多針對(duì)于其靜力和動(dòng)力特性的分析,對(duì)其抗震性能分析的研究還不多[3]。本文以蘭州市小砂溝大橋?yàn)楣こ瘫尘?詳細(xì)分析了該橋在靜力荷載試驗(yàn)的情況下,試驗(yàn)測(cè)試結(jié)果與有限元計(jì)算結(jié)果,并通過(guò)有限元法評(píng)估了該橋梁的工作狀況、安全性能及抗震性能,評(píng)判其是否符合橋梁運(yùn)行和維護(hù)的設(shè)計(jì)標(biāo)準(zhǔn)和要求,為后續(xù)同類(lèi)橋梁的建設(shè)提供參考依據(jù)[4]。本文主要研究的內(nèi)容包括:(1)描述了波紋鋼腹板橋梁的力學(xué)性能,并總結(jié)了波形鋼腹板PC箱梁橋在抗彎性能、抗剪切性能以及抗扭轉(zhuǎn)性能等方面的理論結(jié)果。(2)通過(guò)小砂溝大橋的靜力荷載試驗(yàn),得出大量橋梁關(guān)鍵部位相關(guān)的實(shí)驗(yàn)數(shù)據(jù),并將其與有限元軟件得出的結(jié)果進(jìn)行對(duì)比分析,重點(diǎn)分析了小砂溝大橋主橋考核斷面的撓度和應(yīng)力分布,結(jié)果表明:小砂溝大橋主橋的變形在規(guī)范規(guī)定的小變形范圍內(nèi),最大豎向位移與橋梁跨度比都均小于規(guī)范規(guī)定的1/600,位移校驗(yàn)系數(shù)滿(mǎn)足一般不大于1的要求;控制截面實(shí)測(cè)應(yīng)力值變化規(guī)律和理論分析基本吻合。(3)利用有限元軟件對(duì)小砂溝大橋進(jìn)行動(dòng)力特性分析、模態(tài)分析和抗震分析,獲得其自振頻率、振型以及地震動(dòng)效應(yīng)。采用反應(yīng)譜法和動(dòng)態(tài)時(shí)程分析法對(duì)該橋在E1地震作用下的地震響應(yīng)結(jié)果進(jìn)行分析。其中,采用規(guī)范加速度反應(yīng)譜法的輸入橋譜曲線(xiàn),分別就橋梁的順橋向、橫橋向及豎向作用下得到了該橋在位移及內(nèi)力地震響應(yīng)的一般規(guī)律;動(dòng)態(tài)時(shí)程分析法則采用El-Centro波、Taft波以及由規(guī)范反應(yīng)譜擬合而成的人工波對(duì)該橋進(jìn)行時(shí)程反應(yīng)分析,通過(guò)比較兩種分析的結(jié)果進(jìn)而得出該橋抗震設(shè)計(jì)的合理性。
[Abstract]:As a new type of steel-concrete composite structure, PC composite box girder bridge with corrugated steel webs perfectly interprets the excellent performance of steel-concrete composite structure. The corrugated shape of web plate is obviously smaller than that of ordinary concrete box girder structure web plate, and the weight of the superstructure of the bridge is obviously reduced. The bearing capacity of the substructure is also reduced [1]. At the same time, it has the advantages of high prestressing efficiency, short construction period and beautiful appearance, etc. It has developed rapidly in France and other European countries, and has also been applied and studied well in Japan. At present, this type of bridge has good practicability and development prospect. Its application is gradually developed from simply supported box girder with equal section to continuous steel system with variable section and large span. The structure is more beautiful and the bearing capacity is gradually strengthened [2]. The existing research is mainly to analyze the contribution of the corrugated web of this kind of structure to the bridge's bending, shear and torsion resistance, etc. The finite element analysis of the corrugated steel web bridge is mostly aimed at the static and dynamic analysis of the bridge. There are few studies on seismic performance analysis. Taking Xiaoshagou Bridge in Lanzhou City as the engineering background, the test results and the finite element calculation results of the bridge under static load test are analyzed in detail in this paper, and the working condition of the bridge is evaluated by the finite element method. Safety performance and seismic performance, judging whether they meet the design standards and requirements of bridge operation and maintenance, and providing a reference basis for the subsequent construction of similar bridges [4]. The main contents of this paper are as follows: (1) the mechanical properties of corrugated steel web bridge are described, and the bending behavior of corrugated steel web PC box girder bridge is summarized. Theoretical results of shear and torsion resistance. (2) through the static load test of Xiaoshagou Bridge, a large number of experimental data about the key parts of the bridge are obtained. The results obtained by finite element software are compared and analyzed, and the deflection and stress distribution of the checking section of the main bridge of Xiaoshagou Bridge are analyzed. The results show that the deformation of the main bridge of Xiaoshagou Bridge is within the range of small deformation specified in the code. The ratio of the maximum vertical displacement to the span of the bridge is less than 1 / 600 as stipulated in the code, and the displacement check coefficient meets the general requirement of less than 1. The variation law of the measured stress values of the control section is basically consistent with the theoretical analysis. (3) the dynamic characteristics modal analysis and seismic analysis of Xiaoshagou Bridge are carried out by using finite element software. The natural vibration frequency mode shape and ground motion effect of the bridge are obtained. Response spectrum method and dynamic time history analysis were used to analyze the seismic response of the bridge under E1 earthquake. Among them, the input bridge spectrum curve of the standard acceleration response spectrum method is used to obtain the general law of the bridge's displacement and internal force seismic response under the action of the bridge's forward, transverse and vertical direction, respectively. The dynamic time-history analysis method uses El-Centro wave, Taft wave and artificial wave fitting from the normative response spectrum to analyze the time-history response of the bridge. By comparing the results of the two kinds of analysis, the rationality of seismic design of the bridge is obtained.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U448.23

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