本文關(guān)鍵詞：界面狀況對(duì)鋼管混凝土拱橋力學(xué)性能的影響　出處：《廣州大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 鋼管混凝土拱橋 桁式拱肋 脫空 試驗(yàn)研究 有限元

【摘要】：桁式鋼管混凝土拱橋主拱肋主要由上下弦桿、平聯(lián)、腹桿組成，具有整體性強(qiáng)、抗彎剛度大、延性好等特點(diǎn)，其受力特性與單圓管鋼管混凝土拱橋類似，桁式拱橋主要是上、下2個(gè)圓鋼管混凝土受力，且桿件是以受軸向受力為主，能充分發(fā)揮材料的特性，在土建工程中被越來越來廣泛地應(yīng)用，然而目前針對(duì)該類結(jié)構(gòu)的設(shè)計(jì)理論和試驗(yàn)研究較少，還有待于深入研究。 為了更好的研究不同界面狀況對(duì)桁式鋼管混凝土拱橋力學(xué)性能的影響，本文首先對(duì)四肢格構(gòu)式圓形截面鋼管混凝土桁式構(gòu)件進(jìn)行了試驗(yàn)研究，從兩個(gè)方面探討了鋼管混凝土桁式構(gòu)件的界面粘結(jié)性能對(duì)其承載能力的影響。一方面以初始脫粘為基本參數(shù)對(duì)四肢格構(gòu)式圓截面鋼管混凝土桁式構(gòu)件進(jìn)行了試驗(yàn)研究，另一方面以脫空高度為基本參數(shù)對(duì)桁式構(gòu)件進(jìn)行了兩點(diǎn)加載試驗(yàn)。在此基礎(chǔ)上，采用ABAQUS軟件進(jìn)行有限元計(jì)算分析，驗(yàn)證了數(shù)值模擬的正確性和可行性，最后建立了鋼管混凝土拱橋模型，進(jìn)行了參數(shù)分析。 本文具體做了以下幾方面的工作： （1）為了探討鋼管混凝土桁架結(jié)構(gòu)界面部分脫粘對(duì)鋼管混凝土粘結(jié)界面力學(xué)性能的影響，設(shè)計(jì)制作了鋼管混凝土桁梁試件，，然后對(duì)鋼管混凝土桁梁試件的粘結(jié)界面進(jìn)行了不同程度的界面處理，分別進(jìn)行了鋼管內(nèi)壁抹油脂和刮毛處理的對(duì)比實(shí)驗(yàn)，考察其對(duì)鋼管混凝土界面粘結(jié)性能的影響。 （2）為了探討高度脫空率對(duì)鋼管混凝土桁架結(jié)構(gòu)粘結(jié)界面的影響，本文進(jìn)行了考慮完全粘結(jié)和高度脫空率為20%的對(duì)比實(shí)驗(yàn)，考察高度脫空率對(duì)鋼管混凝土桁架結(jié)構(gòu)極限承載力，結(jié)構(gòu)剛度的影響。 （3）在試驗(yàn)研究的基礎(chǔ)上，文章對(duì)圓形鋼管混凝土桁架的荷載-變形全過程關(guān)系進(jìn)行了深入研究，建立了鋼管混凝土桁架的非線性有限元計(jì)算模型，通過和典型試驗(yàn)結(jié)果的對(duì)比分析，驗(yàn)證了模型的合理性。在此基礎(chǔ)上，筆者對(duì)桁梁試件在受彎狀態(tài)下時(shí)的荷載-變形全過程關(guān)系進(jìn)行了計(jì)算分析，深入研究了組成桁梁的各桿件在受力過程中的應(yīng)力應(yīng)變分布和變化規(guī)律。 （4）在得到一系列可靠的數(shù)據(jù)和一般性規(guī)律后，建立了單圓管拱肋和啞鈴型拱肋的有限元計(jì)算模型，用ABAQUS軟件來模擬各參數(shù)對(duì)其力學(xué)性能的影響。計(jì)算結(jié)果表明脫空對(duì)單圓管拱肋的承載能力影響并不明顯，但對(duì)啞鈴型拱肋的影響較大。
[Abstract]:CFST Truss Arch Bridge arch rib is mainly composed of upper and lower chords, flat, web member, which has a strong integrity, bending stiffness, good ductility characteristics, its mechanical characteristics and single tube CFST arch bridge, truss arch bridge is mainly on the 2 round of steel tube concrete the rod is in force, and axial force, can give full play to the properties of materials in civil engineering is applied more and more widely, however, for this kind of structure design theory and test study has yet to be studied.
In order to study the influence of different interface conditions on the performance of truss type steel pipe concrete mechanics of arch bridge, this paper studied on the limbs of lattice circular CFST Truss component, discusses the interfacial adhesion between CFST Truss members can influence on the bearing capacity from two aspects. On the one hand, the initial debonding is studied as the basic parameters of the limbs of lattice type circular cross-section steel pipe concrete truss members, on the other hand the cavity height as the basic parameters of two loading test of truss members. On this basis, adopt finite element analysis using ABAQUS software to verify the correctness and feasibility of the numerical simulation finally, the model of CFST arch bridge is established, the parameters were analyzed.
This article has done the following aspects of the work:
(1) in order to investigate the structure of concrete filled steel tube truss part interface debonding on interfacial mechanical bonding performance of concrete filled steel tube, design of CFST Truss Beam specimens, then the interface of concrete filled steel tube truss beam bonding parts, respectively compared the pipe wall grease and shaving the influence of the interfacial bond strength of concrete filled steel tube.
(2) in order to investigate the influence of high void ratio on the bond interface of CFST Truss Structure, a comparative experiment considering the complete bonding and high void ratio of 20% is carried out. The influence of high void ratio on the ultimate bearing capacity and structural stiffness of CFST Truss Structure is investigated.
(3) on the basis of the experimental study, the load of concrete filled circular steel tubular truss deformation relationship is studied, a nonlinear finite element model of concrete filled steel tube truss, through comparative analysis and typical test results, verify the rationality of the model. On this basis, the author of the truss load beams in bending under the condition of the whole process of deformation relationship is analyzed and in-depth study of the composition of truss members in the loading process of the stress and strain distribution and variation.
(4) in a series of reliable data and general rule, established the finite element single tube arch rib and dumbbell arch model, using ABAQUS software to simulate the effects of different parameters on the mechanical properties. The calculation results show that the bearing capacity of the arch rib cavity effect is not obvious on the single circle the dumbbell shaped tube, but the arch effect.

【學(xué)位授予單位】：廣州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441;U448.22

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本文編號(hào)：1400416