【摘要】：近年來，伴隨著我國交通基礎(chǔ)設(shè)施大規(guī)模建設(shè)，大跨度斜拉橋的建設(shè)得到了快速發(fā)展。斜拉索的巨大索力斜向并集中地作用于索梁錨固結(jié)構(gòu)，錨固區(qū)結(jié)構(gòu)的安全是整個大橋安全的關(guān)鍵。因此對斜拉橋索梁錨固結(jié)構(gòu)提出了更高要求。 目前，斜拉橋的索梁錨固形式主要有錨管式、錨箱式、耳板式和錨拉板式四種。錨拉板具有構(gòu)造簡潔、便于加工、易于維護(hù)等獨(dú)特優(yōu)點(diǎn)，但錨固區(qū)受力集中、結(jié)構(gòu)復(fù)雜，在設(shè)計荷載作用下可能出現(xiàn)塑性區(qū)域，車輛動荷載引起的疲勞問題也比較突出。只是通過空間有限元仿真計算，很難準(zhǔn)確把握錨固點(diǎn)局部的實(shí)際受力狀況。因此，通過足尺模型試驗(yàn)，深入研究錨拉板式索梁錨固結(jié)構(gòu)的傳力機(jī)理及疲勞可靠性是非常必要的。本文結(jié)合工程實(shí)例，對某斜拉橋錨拉板式索梁錨固結(jié)構(gòu)進(jìn)行了足尺模型靜力和疲勞試驗(yàn)。具體研究內(nèi)容分為以下幾個方面。 1.簡述了索梁錨固結(jié)構(gòu)試驗(yàn)的國內(nèi)外研究現(xiàn)狀，重點(diǎn)介紹了錨拉板式索梁錨固結(jié)構(gòu)的特點(diǎn)，對四種索梁錨固結(jié)構(gòu)的傳力路徑進(jìn)行了介紹。 2.通過對主橋整體結(jié)構(gòu)的有限元仿真分析，，選取設(shè)計工況下最大斜拉索索力對應(yīng)的索梁錨固區(qū)進(jìn)行試驗(yàn)研究；建立所選索梁錨固區(qū)結(jié)構(gòu)的局部有限元模型，考察錨固區(qū)結(jié)構(gòu)的應(yīng)力分布規(guī)律，優(yōu)化試驗(yàn)?zāi)Ｐ偷脑O(shè)計尺寸。 3.通過索梁錨固區(qū)結(jié)構(gòu)足尺模型靜力試驗(yàn)，研究錨拉板及鋼箱梁在設(shè)計荷載作用下的實(shí)際工作性能。結(jié)合試驗(yàn)和仿真分析，進(jìn)一步研究索梁錨固區(qū)各構(gòu)件的力學(xué)性能，同時檢驗(yàn)結(jié)構(gòu)的抗超載能力和安全性。 4.根據(jù)國內(nèi)外相關(guān)規(guī)范對疲勞荷載模型的規(guī)定，確定索梁錨固區(qū)結(jié)構(gòu)疲勞試驗(yàn)的疲勞荷載。對索梁錨固區(qū)結(jié)構(gòu)進(jìn)行常幅疲勞試驗(yàn)，評估錨拉板式索梁錨固區(qū)結(jié)構(gòu)的抗疲勞性能。 5.總結(jié)錨拉板式索梁錨固區(qū)足尺模型試驗(yàn)經(jīng)驗(yàn)，采用ABAQUS對耳板式、鋼錨箱式及錨管式三種索梁錨固結(jié)構(gòu)進(jìn)行數(shù)值模擬，通過理論分析，對比4種錨固結(jié)構(gòu)的應(yīng)力分布、傳力機(jī)理、應(yīng)力集中現(xiàn)象。 本文的工作和成果可為以后錨拉板式索梁錨固區(qū)的相關(guān)設(shè)計提供參考。
[Abstract]:In recent years, with the large-scale construction of transportation infrastructure in China, the construction of long span cable-stayed bridge has been developed rapidly. The huge cable force of the cable-stayed cable acts on the anchoring structure of the cable beam. The safety of the Anchorage zone is the key to the safety of the bridge. Therefore, the cable-beam Anchorage structure of cable-stayed bridge is required higher. At present, cable-girder Anchorage of cable-stayed bridge mainly includes four types: pipe anchor, box anchor, ear plate and anchor plate. The anchor plate has the unique advantages of simple structure, easy processing and easy maintenance. However, the anchoring area is concentrated in force, the structure is complex, the plastic area may appear under the action of the design load, and the fatigue problem caused by the dynamic load of the vehicle is also prominent. Only through the spatial finite element simulation calculation, it is difficult to accurately grasp the actual stress condition of the anchoring point. Therefore, it is necessary to study the load transfer mechanism and fatigue reliability of anchor plate cable beam Anchorage structure through full-scale model test. Combined with an engineering example, the static and fatigue tests of a cable-stayed bridge Anchorage structure with anchor plate type cable beam are carried out in full scale model. Specific research content is divided into the following aspects. 1. This paper briefly introduces the research status of cable beam anchoring structure at home and abroad, introduces emphatically the characteristics of anchor structure of anchor plate type cable beam, and introduces the load transfer path of four cable beam anchoring structures. 2. Through the finite element simulation analysis of the whole structure of the main bridge, the cable beam anchoring zone corresponding to the maximum cable-stayed cable force under the design condition is selected for experimental study. The local finite element model of the selected cable beam Anchorage zone structure is established, the stress distribution law of the Anchorage zone structure is investigated, and the design dimension of the test model is optimized. 3. Based on the static test of full-scale model of cable-girder Anchorage zone structure, the practical performance of anchor plate and steel box girder under design load is studied. Combined with the test and simulation analysis, the mechanical properties of the members in the cable beam Anchorage zone are further studied, and the resistance to overload and the safety of the structure are also tested. 4. According to the rules of fatigue load model at home and abroad, the fatigue load of cable beam Anchorage zone structure is determined. In order to evaluate the fatigue resistance of cable beam Anchorage zone structure, a constant amplitude fatigue test was carried out on the cable beam Anchorage zone structure. 5. This paper summarizes the experience of full-scale model test in anchoring zone of anchor plate type cable beam, and uses ABAQUS to simulate three kinds of cable beam anchoring structure: ear-plate type, steel anchor box type and anchor tube type. Through theoretical analysis, the stress distribution and force transfer mechanism of four kinds of anchoring structures are compared. Stress concentration. The work and results of this paper can be used as reference for the design of Anchorage zone of anchor-plate cable-beam in the future.
【學(xué)位授予單位】：北京工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.27

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