本文關(guān)鍵詞： 節(jié)段預(yù)制拼裝墩 靜力試驗 破壞特征 有限元分析 設(shè)計優(yōu)化　出處：《北京交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：為了緩解大城市交通量增加而導(dǎo)致的交通擁堵路況,增建城市高架橋梁是一種有效手段。節(jié)段預(yù)制拼裝墩作為橋梁的下部結(jié)構(gòu),具有施工快速、對既有交通影響小等特點,在近年來備受國內(nèi)外關(guān)注。預(yù)制節(jié)段之間連接構(gòu)造與整體式結(jié)構(gòu)相比,存在一些不確定性,影響了這種結(jié)構(gòu)在實際施工中的應(yīng)用。針對節(jié)段預(yù)制拼裝墩進行試驗及理論研究十分必要。本文進行了2個節(jié)段預(yù)制拼裝混凝土橋墩模型的靜載試驗并進行了數(shù)值模擬分析,主要工作和相關(guān)結(jié)論如下： 1.進行了節(jié)段預(yù)制拼裝混凝土橋墩模型靜載試驗,得到了墩頂水平荷載-位移曲線及相關(guān)應(yīng)變數(shù)據(jù),詳細記錄了試件破壞過程。利用簡化力學(xué)模型和基于平截面假定的橫截面雙向受彎計算程序,對試驗數(shù)據(jù)進行分析。理論分析表明,模型墩的破壞始于墩底素混凝土薄弱面受拉區(qū)的受彎裂縫,最終破壞為受壓區(qū)混凝土壓碎,破壞過程中構(gòu)件發(fā)生了以墩底受壓邊緣為轉(zhuǎn)軸的剛體運動。 2.使用結(jié)構(gòu)有限元分析軟件ABAQUS對節(jié)段拼裝模型墩進行了數(shù)值模擬,將計算結(jié)果與試驗數(shù)據(jù)進行了對比分析。結(jié)果表明,在模型受力全過程中膠黏層材料的應(yīng)力狀態(tài)始終處于彈性階段,接縫處的開裂破壞實際上為與之相近的素混凝土開裂,預(yù)制節(jié)段中的鋼筋對結(jié)構(gòu)整體開裂荷載及極限承載力貢獻較少。 3.進行了墩柱受力行為的簡化理論分析。討論了墩底受壓區(qū)塑性鉸的形成,編制了MATLAB程序進行了模型受彎全過程分析。 4.研究了墩頂豎向荷載大小對節(jié)段拼裝墩受力行為的影響。數(shù)值模擬計算結(jié)果表明,隨著豎向力增大結(jié)構(gòu)整體的開裂荷載和極限承載力均增大,但豎向力增長到一定程度時,結(jié)構(gòu)破壞由彎曲破壞轉(zhuǎn)變?yōu)閴�、彎、剪三者共同作用下的�?fù)雜破壞。 5.基于前述試驗及數(shù)值模擬研究,提出了3種改善節(jié)段預(yù)制拼裝橋墩受力行為的構(gòu)造措施：(1)鋼筋伸入連接鍵位中；(2)鋼筋伸入鍵位同時增加連接鍵位高度；(3)連接鍵位布置于節(jié)段周邊。有限元分析結(jié)果表明,三種改進方案均能使結(jié)構(gòu)整體開裂荷載與極限承載力提升,并且使結(jié)構(gòu)延性增加。 6.論文進行了節(jié)段拼裝墩截面抗彎承載力計算方法的初步探討。
[Abstract]:In order to alleviate the traffic congestion caused by the increase of traffic volume in large cities, it is an effective means to build more urban elevated bridges. As the substructure of the bridge, the precast piers are constructed quickly and have little influence on the existing traffic. In recent years, much attention has been paid at home and abroad. There are some uncertainties in connection construction between prefabricated segments and integral structures. The application of this structure in practical construction is affected. It is necessary to carry out experiments and theoretical studies on segmental precast assembled piers. In this paper, static load tests of two segmental precast assembled concrete pier models are carried out and numerical simulation analysis is carried out. The main work and related conclusions are as follows:. 1. The static load test of precast precast concrete pier is carried out, and the horizontal load-displacement curve and related strain data are obtained. The failure process of the specimen is recorded in detail. The test data are analyzed by using the simplified mechanical model and the calculation program based on the assumption of plane cross section. The failure of the model pier begins with the flexural crack in the tensile area of the weak surface of plain concrete at the bottom of the pier, and the ultimate failure is the crushing of the concrete in the compression zone. During the failure process, the rigid body movement with the compression edge of the pier bottom as the rotation axis occurs. 2. The finite element analysis software ABAQUS is used to simulate the segmental assembly model piers, and the calculated results are compared with the experimental data. The results show that, The stress state of the adhesive layer material is always in the elastic stage during the whole process of the model loading, and the cracking failure at the joint is actually similar to the plain concrete cracking. The steel bars in the precast segment contribute little to the overall cracking load and ultimate bearing capacity of the structure. 3. The simplified theoretical analysis of the stress behavior of the pier column is carried out, the forming of plastic hinge in the compression zone of the pier bottom is discussed, and the MATLAB program is compiled for the analysis of the whole bending process of the model. 4. The influence of the vertical load on the behavior of the pier is studied. The numerical simulation results show that the cracking load and ultimate bearing capacity of the whole structure increase with the vertical force increasing, but the vertical force increases to a certain extent. The structural failure is changed from bending failure to complex failure under the combined action of compression, bending and shear. 5. Based on the foregoing experimental and numerical simulation studies, In this paper, three kinds of structural measures to improve the behavior of precast assembly piers are put forward: 1) the steel bar is extended into the connecting key position and the joint height is increased at the same time, the connection key position is arranged around the segment. The finite element analysis results show that the steel bar is placed in the connection key position, and the finite element analysis results show that the finite element analysis results show that the finite element analysis shows that the finite element analysis shows that. The three improved schemes can increase the cracking load and ultimate bearing capacity of the whole structure and increase the ductility of the structure. 6. The calculation method of section flexural bearing capacity of segmental assembly pier is discussed in this paper.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441;U443.22

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