界面状况对钢管混凝土拱桥力学性能的影响

发布时间：2018-01-09 07:03

本文关键词：界面状况对钢管混凝土拱桥力学性能的影响　出处：《广州大学》2014年硕士论文　论文类型：学位论文

【摘要】：桁式钢管混凝土拱桥主拱肋主要由上下弦杆、平联、腹杆组成，具有整体性强、抗弯刚度大、延性好等特点，其受力特性与单圆管钢管混凝土拱桥类似，桁式拱桥主要是上、下2个圆钢管混凝土受力，且杆件是以受轴向受力为主，能充分发挥材料的特性，在土建工程中被越来越来广泛地应用，然而目前针对该类结构的设计理论和试验研究较少，还有待于深入研究。为了更好的研究不同界面状况对桁式钢管混凝土拱桥力学性能的影响，本文首先对四肢格构式圆形截面钢管混凝土桁式构件进行了试验研究，从两个方面探讨了钢管混凝土桁式构件的界面粘结性能对其承载能力的影响。一方面以初始脱粘为基本参数对四肢格构式圆截面钢管混凝土桁式构件进行了试验研究，另一方面以脱空高度为基本参数对桁式构件进行了两点加载试验。在此基础上，采用ABAQUS软件进行有限元计算分析，验证了数值模拟的正确性和可行性，最后建立了钢管混凝土拱桥模型，进行了参数分析。本文具体做了以下几方面的工作：（1）为了探讨钢管混凝土桁架结构界面部分脱粘对钢管混凝土粘结界面力学性能的影响，设计制作了钢管混凝土桁梁试件，，然后对钢管混凝土桁梁试件的粘结界面进行了不同程度的界面处理，分别进行了钢管内壁抹油脂和刮毛处理的对比实验，考察其对钢管混凝土界面粘结性能的影响。（2）为了探讨高度脱空率对钢管混凝土桁架结构粘结界面的影响，本文进行了考虑完全粘结和高度脱空率为20%的对比实验，考察高度脱空率对钢管混凝土桁架结构极限承载力，结构刚度的影响。（3）在试验研究的基础上，文章对圆形钢管混凝土桁架的荷载-变形全过程关系进行了深入研究，建立了钢管混凝土桁架的非线性有限元计算模型，通过和典型试验结果的对比分析，验证了模型的合理性。在此基础上，笔者对桁梁试件在受弯状态下时的荷载-变形全过程关系进行了计算分析，深入研究了组成桁梁的各杆件在受力过程中的应力应变分布和变化规律。（4）在得到一系列可靠的数据和一般性规律后，建立了单圆管拱肋和哑铃型拱肋的有限元计算模型，用ABAQUS软件来模拟各参数对其力学性能的影响。计算结果表明脱空对单圆管拱肋的承载能力影响并不明显，但对哑铃型拱肋的影响较大。
[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.

【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.22

【参考文献】