【摘要】：近些年來,因為較大的跨越能力、美觀的外形、方便的施工等優(yōu)勢,我國對鋼管混凝土拱橋進行了大量的推廣應(yīng)用。這促使大量橋梁工作者對鋼管混凝土拱橋靜力和動力方面從事了很多的相關(guān)研究,其中穩(wěn)定性和地震響應(yīng)分析尤為被大家所重視。而橫撐作為整個結(jié)構(gòu)中的一部分,它對穩(wěn)定性及地震響應(yīng)產(chǎn)生的影響有其一定的研究價值。本文針對鋼管混凝土拱橋的發(fā)展情況,穩(wěn)定性、地震響應(yīng)及橫撐的相關(guān)研究狀況進行了簡單介紹。對拱結(jié)構(gòu)穩(wěn)定性分類、分析方法和拱面內(nèi)外屈曲基本解析方程做了簡單敘述。接著結(jié)合實際工程,借助有限元軟件模擬實橋狀態(tài),就橫撐的設(shè)置位置、橫撐的數(shù)目以及其形式對橫向穩(wěn)定的影響,采用線彈性穩(wěn)定分析法進行研究;于線彈性范圍內(nèi),針對橫撐設(shè)置位置、數(shù)目以及其形式對橫向地震響應(yīng)的影響,借助動態(tài)時程法進行探討。通過計算可知,該鋼管混凝土拱橋結(jié)構(gòu)的豎向剛度明顯大于結(jié)構(gòu)的橫向剛度,在其實際橫撐布置方式下,穩(wěn)定性滿足規(guī)范要求。針對該結(jié)構(gòu)橫向穩(wěn)定來說,橫撐設(shè)置位置、橫撐數(shù)目均能夠有效增強其結(jié)構(gòu)的橫向剛度,進而提升其橫向穩(wěn)定;此外,“X”字撐、“K”字撐及“米”字撐對橫向穩(wěn)定貢獻程度相近。針對其結(jié)構(gòu)橫向地震響應(yīng)來說,以拱頂橫向位移為參照,橫撐設(shè)置位置、橫撐的數(shù)目有效影響著其結(jié)構(gòu)的橫向地震響應(yīng);就其對結(jié)構(gòu)橫向地震響應(yīng)減弱效果來說,“X”字撐、“K”字撐及“米”字撐對橫向地震響應(yīng)貢獻程度相近。在對橫撐形式的選擇使用上,在同時考慮橫向穩(wěn)定及橫向地震響應(yīng)時,并且兼顧經(jīng)濟效益,不考慮其余因素的影響下,應(yīng)當(dāng)優(yōu)先選用“K”字撐和“X”字撐。
[Abstract]:In recent years, due to the advantages of large span ability, beautiful shape and convenient construction, the concrete-filled steel tubular arch bridge has been widely used in our country. This has prompted a large number of bridge workers to do a lot of research on static and dynamic aspects of concrete-filled steel tubular arch bridge, among which stability and seismic response analysis have been paid more attention to. As a part of the whole structure, the transverse brace has a certain value to study the influence of the stability and seismic response. This paper briefly introduces the development, stability, seismic response and lateral bracing of concrete-filled steel tubular arch bridge. The stability classification of arch structure, the analysis method and the basic analytical equation of buckling inside and outside the arch plane are briefly described. Then combining with the actual project and using finite element software to simulate the state of the real bridge, the location of the transverse brace, the number of the transverse brace and the influence of its form on the lateral stability are studied by the method of linear elastic stability analysis. In the range of linear elasticity, the influence of position, number and form of transverse brace on lateral seismic response is discussed by means of dynamic time-log method. The results show that the vertical stiffness of the concrete filled steel tubular arch bridge is obviously larger than the transverse stiffness of the structure and the stability meets the requirements of the code under the actual arrangement of transverse braces. For the lateral stability of the structure, the location and the number of transverse braces can effectively enhance the transverse stiffness of the structure, and then enhance its lateral stability. In addition, X, K and M support contribute to lateral stability to the same extent. For the lateral seismic response of its structure, the transverse displacement of the arch roof is taken as the reference, and the position of the transverse brace is set, and the number of the transverse brace affects the lateral seismic response of the structure effectively. As far as the weakening effect of lateral seismic response is concerned, the contribution of "X" bracing, "K" bracing and "rice" bracing to lateral seismic response is similar. In the selection and use of transverse braces, when lateral stability and lateral seismic response are considered at the same time, and economic benefits are taken into account, "K" bracing and "X" bracing should be preferred when other factors are not considered.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U442.55;U448.22

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相關(guān)期刊論文 前1條

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本文編號：2383245