本文關(guān)鍵詞：高墩多跨連續(xù)剛構(gòu)橋高墩剛度匹配問(wèn)題研究　出處：《長(zhǎng)安大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 高墩 連續(xù)剛構(gòu)橋 剛度匹配 雙肢空心墩 單肢薄壁墩 匹配原則

【摘要】：連續(xù)剛構(gòu)橋呈現(xiàn)跨徑增大、跨數(shù)增多、墩高增加的趨勢(shì),當(dāng)墩的高度存在較大的高度差的情況下,在外荷載作用下,墩、梁的內(nèi)力呈現(xiàn)不均衡性,尤其是由于混凝土收縮徐變、溫度作用、基礎(chǔ)不均勻沉降等將對(duì)整個(gè)結(jié)構(gòu)帶來(lái)較大的不均衡次內(nèi)力。連續(xù)剛構(gòu)橋墩梁固結(jié),當(dāng)上部結(jié)構(gòu)參數(shù)確定時(shí),墩間相對(duì)剛度不同對(duì)結(jié)構(gòu)內(nèi)力分布及變形產(chǎn)生較大的影響,合理的高墩剛度匹配能使結(jié)構(gòu)受力更為合理。文中以咸旬高速公路三水河特大橋?yàn)楣こ瘫尘?首先,運(yùn)用有限元程序?qū)Σ煌叨談偠绕ヅ涞慕Y(jié)構(gòu)進(jìn)行分析研究,通過(guò)比較分析尋找出影響結(jié)構(gòu)內(nèi)力及變形的關(guān)鍵因素;然后,結(jié)合多跨連續(xù)剛構(gòu)橋墩的剛度匹配基本原則,對(duì)高墩剛度匹配進(jìn)行分析研究,進(jìn)而為墩的剛度匹配優(yōu)化設(shè)計(jì)提供有益的參考。主要完成了以下工作:1、總結(jié)了近年來(lái)高墩剛度匹配相關(guān)基本計(jì)算方法及理論研究成果,分析并總結(jié)了墩剛度對(duì)連續(xù)剛構(gòu)橋內(nèi)力及變形的影響。2、對(duì)高墩常用的結(jié)構(gòu)類型進(jìn)行總結(jié)對(duì)比分析,對(duì)不同類型墩的剛度進(jìn)行了比較;并對(duì)不同類型高墩建立抗推剛度計(jì)算模型及對(duì)高墩抗推剛度計(jì)算方法分析總結(jié),同時(shí)分析了高墩抗推剛度影響因素。3、對(duì)不同墩位高墩剛度改變,外荷載作用下,結(jié)構(gòu)內(nèi)力及墩頂位移的變化規(guī)律進(jìn)行比較分析,發(fā)現(xiàn)距離中跨跨中越遠(yuǎn)墩剛度變化對(duì)結(jié)構(gòu)內(nèi)力及位移產(chǎn)生的影響越大。4、比較不同荷載工況下,改變墩的剛度時(shí),連續(xù)剛構(gòu)橋內(nèi)力及位移的影響敏感度,通過(guò)比較分析得出:不同高墩剛度匹配情況下,恒荷載對(duì)連續(xù)剛構(gòu)橋內(nèi)力及位移影響敏感性較小;系統(tǒng)溫度變化及混凝土收縮徐變對(duì)結(jié)構(gòu)內(nèi)力及變形影響較大。5、以主墩內(nèi)力及應(yīng)力為控制目標(biāo),對(duì)結(jié)構(gòu)對(duì)稱、不同跨數(shù)連續(xù)剛構(gòu)橋墩的剛度匹配進(jìn)行分析研究,分析不同剛度匹配下,墩頂、墩底處內(nèi)力及應(yīng)力變化規(guī)律,通過(guò)分析得出:對(duì)于對(duì)稱的偶數(shù)跨連續(xù)剛構(gòu)橋,中墩剛度可與其余墩剛度任意比例匹配;對(duì)于墩高相差不大的奇數(shù)跨連續(xù)剛構(gòu)橋,在保證結(jié)構(gòu)強(qiáng)度及穩(wěn)定的同時(shí),相鄰的靠近邊跨側(cè)墩與靠近中跨側(cè)墩的剛度比在1:6~1:7左右為宜,且隨跨徑比不同,合理墩間剛度比不同;當(dāng)邊中墩高度在達(dá)到0.5時(shí),合理墩間剛度比在1:4左右,將邊墩設(shè)計(jì)成抗推剛度較小的雙肢墩對(duì)結(jié)構(gòu)受力更有利。
[Abstract]:Continuous rigid frame bridge presents the tendency of increasing span, increasing span number and increasing pier height. When the height of pier exists a large height difference, under external load, the internal force of pier and beam is unbalanced. Especially because of the shrinkage and creep of concrete, temperature and uneven settlement of foundation, etc. Continuous rigid frame bridge pier beam consolidation, when the superstructure parameters are determined. The difference of relative stiffness between piers has a great influence on the distribution and deformation of the internal force of the structure. Reasonable matching of the stiffness of the high pier can make the force of the structure more reasonable. In this paper, taking the Xian-ten-day Expressway Sanshui River Bridge as the engineering background, first of all. The finite element program is used to analyze and study the structures with different stiffness matching of high piers, and the key factors affecting the internal force and deformation of the structure are found through the comparative analysis. Then, combined with the basic principle of stiffness matching of multi-span continuous rigid frame bridge pier, the stiffness matching of high pier is analyzed and studied, which provides a useful reference for the optimization design of pier stiffness matching. This paper summarizes the basic calculation methods and theoretical research results of the high pier stiffness matching in recent years, and analyzes and summarizes the influence of pier stiffness on the internal force and deformation of continuous rigid frame bridge. 2. The common structural types of high piers are summarized and analyzed, and the stiffness of different types of piers are compared. The calculation model of anti-pushing stiffness and the calculation method of anti-pushing stiffness of high pier are established for different types of high pier. At the same time, the factors affecting the anti-pushing stiffness of high pier are analyzed, and the stiffness of high pier in different positions is changed. Under the action of external load, the changes of internal force and displacement of pier top are compared and analyzed. It is found that the variation of pier stiffness in the middle span of middle span has greater influence on the internal force and displacement of the structure. By comparing the sensitivity of internal force and displacement of continuous rigid frame bridge under different load conditions and changing the stiffness of pier, it is concluded that: different high pier stiffness match. The influence of constant load on the internal force and displacement of continuous rigid frame bridge is less sensitive. The change of system temperature and shrinkage and creep of concrete have great influence on the internal force and deformation of the structure. 5. Taking the internal force and stress of the main pier as the control target, the structure is symmetrical. The stiffness matching of the pier of continuous rigid frame bridge with different span number is analyzed and the internal force and stress changes at the top and bottom of the pier under different stiffness matching are analyzed. The results show that: for symmetrical even span continuous rigid frame bridge. The stiffness of the middle pier can be matched with the stiffness of the other piers in any proportion. For the odd span continuous rigid frame bridge with little difference in pier height, the stiffness ratio of adjacent side span pier and near middle span side pier is about 1: 6 or 1: 7, while the structural strength and stability are guaranteed. The reasonable stiffness ratio between piers is different with different span ratio. When the height of the middle pier reaches 0.5 and the reasonable ratio of stiffness between the piers is about 1: 4, it is more favorable to design the side pier as a two-legged pier with low pushing stiffness.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441;U448.23

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本文編號(hào)：1381195