本文選題：高墩多跨 + 曲線連續(xù)剛構(gòu)��； 參考：《鄭州大學(xué)》2014年碩士論文

【摘要】：我國西部大部分地區(qū)屬山嶺重丘區(qū)，地形復(fù)雜，山高谷深。高墩多跨曲線連續(xù)剛構(gòu)橋由于其能夠很好地克服地形、地貌的影響，逐漸成為了跨越山區(qū)大河及深谷的主要橋型。本文以三淅高速盧靈段的白水峪大橋?yàn)橐劳�，對高墩多跨曲線連續(xù)剛構(gòu)橋的地震時(shí)程響應(yīng)最不利激勵(lì)方向進(jìn)行了分析，主要研究內(nèi)容及結(jié)論如下： （1）綜述國內(nèi)外研究現(xiàn)狀，，總結(jié)高墩多跨曲線連續(xù)剛構(gòu)橋動(dòng)力分析的理論及方法。 （2）分別建立梁單元和實(shí)體單元模型，研究不同的曲率半徑以及墩高對結(jié)構(gòu)自振特性的影響，高墩曲線多跨連續(xù)剛構(gòu)橋的基頻所對應(yīng)的模態(tài)為主梁和墩的縱飄，且一階縱飄的自振頻率隨著曲率半徑增大而增大；對于一階橫彎與前四階豎彎來說，自振頻率隨著曲率半徑增大而減小，隨著墩高增大而減小。 （3）運(yùn)用動(dòng)態(tài)時(shí)程分析法施加不同角度的地震時(shí)程波研究最不利激勵(lì)方向，在順橋向和橫橋向的多維激勵(lì)下，最靠近跨中的橋墩墩頂與主梁邊界支承處的割線及垂直于此割線方向的激勵(lì)方向?yàn)樽畈焕?lì)方向。 （4）在最不利激勵(lì)方向下，研究了曲率半徑與墩高對結(jié)構(gòu)地震響應(yīng)的敏感性，在橫向激勵(lì)下，跨中橫向位移與邊墩的內(nèi)力隨著曲率半徑增大而增大，隨著墩高的增加而增大，3#墩的內(nèi)力隨著曲率半徑的增大變化并不明顯；在縱向激勵(lì)下，跨中縱向位移較小，橋墩的內(nèi)力隨著曲率半徑的增大而減小，隨著墩高的增大而增大。
[Abstract]:The western part of our country belongs to the mountain heavy hill area, the terrain is complex, the mountain is high and the valley is deep. Because of its ability to overcome the influence of topography and geomorphology, the multi-span continuous rigid frame bridge with high piers has gradually become the main bridge type crossing the mountain rivers and deep valleys. Based on the Baishuiyu Bridge in the Luling section of Sanzheng Expressway, this paper analyzes the most unfavorable excitation direction of the seismic time history response of the multi-span continuous rigid frame bridge with high piers. The main research contents and conclusions are as follows: 1) summarize the research status at home and abroad, summarize the theory and method of dynamic analysis of multi-span curved continuous rigid frame bridge with high piers. (2) the beam element model and the solid element model are established, and the influence of different curvature radius and pier height on the natural vibration characteristics of the structure is studied. The fundamental frequency corresponding to the fundamental frequency of the curved multi-span continuous rigid frame bridge with high pier is mainly the longitudinal floating of beam and pier. For the first order transverse bending and the first four vertical bending, the natural frequency decreases with the increase of curvature radius and decreases with the increase of pier height. 3) using dynamic time-history analysis method to study the most unfavorable direction of excitation by applying seismic time-history waves at different angles, under the multi-dimensional excitation in the direction of forward bridge and transverse direction. The most unfavorable excitation direction is the cutting line at the top of pier and the boundary support of the main beam and the direction perpendicular to the direction of the bridge pier in the middle of span. The sensitivity of curvature radius and pier height to the seismic response of the structure is studied under the most unfavorable excitation direction. Under transverse excitation, the transverse displacement of span and the internal force of side pier increase with the increase of curvature radius. With the increase of pier height, the internal force of pier increases with the increase of radius of curvature, and under longitudinal excitation, the longitudinal displacement of span is smaller, the internal force of pier decreases with the increase of radius of curvature, and increases with the increase of height of pier.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.23;U442.55

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