【摘要】：隨著我國公路交通事業(yè)在西部地區(qū)的快速發(fā)展,山區(qū)高等級公路上修建了大量控制性工程——橋梁。曲線橋梁能夠很好的克服山區(qū)地形限制,服從路線整體設(shè)計要求,從而推動了曲線剛構(gòu)橋的迅速發(fā)展。自1971年美國圣費(fèi)爾南多(San Fernando)地震后曲線梁橋的抗震研究起步至2008年汶川地震,曲線橋梁仍遭到不同程度的震害,表明國內(nèi)外學(xué)者就曲線橋梁的地震反應(yīng)分析與抗震性能的研究難度大,認(rèn)識規(guī)律不足,亟待深入探討。本文以某高速公路上一座多跨預(yù)應(yīng)力混凝土曲線連續(xù)剛構(gòu)橋為工程背景,采用Midas Civil軟件建立了考慮樁-土相互作用的結(jié)構(gòu)模型進(jìn)行動力特性分析、反應(yīng)譜分析和動力時程分析,具體研究內(nèi)容與所得結(jié)論如下:(1)運(yùn)用Midas Civil有限元軟件建立了該連續(xù)剛構(gòu)橋的兩種模型——墩底固結(jié)模型與考慮樁-土效應(yīng)的模型,對其進(jìn)行模態(tài)分析并比較兩種模型的自振頻率及相應(yīng)振型特點(diǎn)等動力特性,結(jié)果表明:考慮樁土相互作用后,一階振型周期增大69.03%,而隨著振型階次的增加,高階振型的周期與墩底固結(jié)模型對應(yīng)的周期逐漸接近,十階自振周期僅增大6.43%。說明在軟土地基中,樁基礎(chǔ)增大了結(jié)構(gòu)的自振周期,但對高階振型周期的影響不大。(2)對曲線剛構(gòu)橋進(jìn)行E1地震作用下的水平雙向反應(yīng)譜分析,得到結(jié)構(gòu)最大的地震響應(yīng)以確定最不利地震動水平輸入方向,然后對墩底固結(jié)模型與考慮樁-土效應(yīng)的模型進(jìn)行反應(yīng)譜分析與動力時程分析,得出:考慮樁-土效應(yīng)后橋梁結(jié)構(gòu)橫橋向的地震響應(yīng)比順橋向大;對該曲線連續(xù)剛構(gòu)橋進(jìn)行抗震性能分析時,可以忽略豎向地震動的影響;地震作用下,動力時程法的計算結(jié)果不小于反應(yīng)譜法計算結(jié)果的80%,符合最新頒布的《公路橋梁抗震設(shè)計細(xì)則》規(guī)定要求。(3)設(shè)計三種橋墩形式,即原橋矩形實心墩、雙肢薄壁實心墩和內(nèi)八角形空心墩進(jìn)行時程分析,結(jié)果表明:采用雙肢薄壁空心墩,順橋向除1#墩內(nèi)力增加外,其他橋墩均明顯減少,而橫橋向所有橋墩的內(nèi)力變化不大,位移大幅增加;采用內(nèi)八角形空心墩,其彎矩和剪力均小于矩形實心墩,只是墩頂位移略有增大而已;由墩頂、墩底的最大應(yīng)力比較可知,雙肢薄壁實心墩最大,矩形實心墩次之,內(nèi)八角形空心墩最小。因此建議將原矩形實心墩改為內(nèi)八角形空心墩,該橋的抗震性能更好。
[Abstract]:With the rapid development of highway traffic in the western region of China, a large number of control projects - bridges have been built on high grade highways in mountain areas. The curved bridges can overcome the terrain constraints of the mountain areas well, comply with the overall design requirements of the route, and thus promote the rapid development of the curved rigid frame bridge. Since 1971, San Fernando (San Fernan, USA) Do) after the earthquake, the seismic study of the curved beam bridge started to the Wenchuan earthquake in 2008, and the curve bridges were still subjected to different degrees of earthquake damage. It shows that the scholars at home and abroad are difficult to study the seismic response analysis and seismic performance of the curved bridges, and the law of understanding is insufficient. The curved continuous rigid frame bridge is the engineering background. The dynamic characteristic analysis, the response spectrum analysis and the dynamic time history analysis of the pile soil interaction are established by Midas Civil software. The specific research contents and the conclusions are as follows: (1) the two models of the continuous rigid frame bridge are established by using Midas Civil finite element soft parts. The modal analysis of the bottom consolidation model and the pile soil effect model is carried out and the dynamic characteristics of the two models are compared and the results show that the first order mode period increases by 69.03% after considering the interaction of pile and soil, and the period of the high order mode is corresponding to the consolidation model of the bottom of the pier with the increase of the order of vibration. The cycle gradually approaches, and the ten order self vibration period increases only 6.43%., which indicates that in the soft soil foundation, the pile foundation increases the self vibration period of the structure, but has little effect on the high order mode period. (2) the horizontal bi-directional response spectrum analysis of the curved rigid frame bridge is carried out under the E1 earthquake, and the maximum seismic response is obtained to determine the most unfavorable ground motion level. In the direction of input, the response spectrum analysis and dynamic time history analysis of the pier bottom consolidation model and the pile soil effect model are carried out. It is concluded that the seismic response of the bridge structure is larger than that of the clockwise bridge after the pile soil effect is considered, and the effect of the vertical ground motion can be ignored when the seismic performance of the continuous rigid frame bridge is analyzed; the seismic action can be ignored. The calculation results of the dynamic time history method are not less than 80% of the calculation results of the response spectrum method, which conforms to the newly promulgated regulations for the seismic design of highway bridges. (3) the design of three kinds of bridge piers, namely the original bridge rectangular solid piers, the two limb thin-walled solid piers and the inner octagonal hollow piers, is analyzed. The results show that the two limb thin-walled hollow piers are adopted. In addition to the increase of the internal force of the bridge to the 1# pier, the other piers are obviously reduced, while the internal forces of the transverse bridge to all the piers have little change, and the displacement is greatly increased. The bending moment and shear force of the inner octagonal hollow piers are smaller than the rectangular solid piers, but the displacement of the pier top is only slightly increased; the two limb thin wall solid piers are compared to the pier top and the bottom of the pier. It is suggested that the original rectangular solid pier should be replaced by the inner octagonal hollow pier, which has better seismic performance.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U442.55;U448.23

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