發(fā)布時(shí)間：2018-06-30 17:29

  本文選題：懸索橋 + 板桁結(jié)合橋面系��； 參考：《西南交通大學(xué)》2014年碩士論文

【摘要】：大跨度懸索橋的發(fā)展方興未艾,隨著跨度的增大,恒載在總荷載中的比重進(jìn)一步增加,這對(duì)主纜、加勁梁等構(gòu)件的設(shè)計(jì)、制作及安裝提出更高要求。將橋面與主桁結(jié)合起來的板桁結(jié)合橋面系能夠較為有效地減輕結(jié)構(gòu)恒載、簡化傳統(tǒng)桁梁懸索橋的橋面系構(gòu)造。但目前采用該結(jié)構(gòu)的懸索橋較少,對(duì)其認(rèn)識(shí)及研究還不深；且該結(jié)構(gòu)構(gòu)造復(fù)雜,正交異性板構(gòu)件縱橫交錯(cuò),如何對(duì)其進(jìn)行簡化計(jì)算需要進(jìn)一步的研究。針對(duì)以上問題,本文主要通過以下幾個(gè)方面對(duì)板桁結(jié)合橋面系加勁梁進(jìn)行分析研究： (1)、對(duì)不同結(jié)合方式的桁架加勁梁進(jìn)行計(jì)算分析,研究板桁結(jié)合型與分離式橋面系加勁梁力學(xué)性能的異同；對(duì)不同鋼橋面支撐方式的板桁結(jié)合橋面系在第一系統(tǒng)荷載、橋面荷載作用下進(jìn)行計(jì)算分析,借此研究板桁結(jié)合橋面系的合理構(gòu)造及力學(xué)特性。 (2)、將普通桁架等效剪切厚度的求解方法運(yùn)用于懸索橋板桁結(jié)合橋面系中,編制了桁梁連續(xù)化程序、平面桿系幾何非線性程序；討論了剛性節(jié)點(diǎn)、剪切變形對(duì)結(jié)構(gòu)內(nèi)力位移的影響,提出了板桁結(jié)合橋面系加勁梁整體計(jì)算時(shí)較為合理的簡化模型。 (3)分析得到了懸索橋板桁結(jié)合橋面系全橋范圍內(nèi)的剪力滯變化規(guī)律；據(jù)此討論了板桁結(jié)合橋面系的縱向位移函數(shù)。在連續(xù)化桁梁的基礎(chǔ)上,采用變分法得到了簡支梁受均布荷載、集中荷載的剪力滯微分方程解析解,提出了基于離散吊索力及彎矩影響區(qū)間的懸索橋板桁結(jié)合橋面系剪力滯計(jì)算分析方法,并對(duì)其影響參數(shù)進(jìn)行了討論。 (4)考慮到變分法求解的局限性,本文根據(jù)能量法及虛功增量方程詳細(xì)地推導(dǎo)了考慮剪切變形及剪力滯影響的梁單元彈性剛度矩陣、幾何剛度矩陣,編制相關(guān)程序；通過與ANSYS的對(duì)比驗(yàn)證了本文程序的精度。 通過本文的分析研究,得到了懸索橋板桁結(jié)合橋面系加勁梁的力學(xué)特性、換算梁法合理的簡化模型及剪力滯的計(jì)算分析方法。本文的研究表明：板桁結(jié)合橋面系加勁梁受力復(fù)雜,計(jì)算分析可根據(jù)不同的力學(xué)特點(diǎn)來選取不同的簡化模型；采用換算梁法進(jìn)行整體計(jì)算時(shí)考慮剛性節(jié)點(diǎn)及剪切變形的影響能夠提高計(jì)算精度；本文提出的基于離散吊索力及彎矩影響區(qū)間的剪力滯分析方法,對(duì)于懸索橋加勁梁剪力滯求解具有物理概念清楚、易程序化的優(yōu)點(diǎn),且精度較高,但該方法受限于剪力滯微分方程的求解；對(duì)于含有較為復(fù)雜縱向位移函數(shù)的剪力滯問題,采用本文提出的基于插值函數(shù)的剪力滯一維梁段有限元法較為方便。
[Abstract]:The development of long-span suspension bridge is in the ascendant. With the increase of span, the proportion of dead load in the total load increases further, which puts forward higher requirements for the design, manufacture and installation of the main cable, stiffening beam and other components. The slab-truss deck system combined with the main truss can effectively reduce the dead load of the structure and simplify the structure of the deck system of the traditional truss suspension bridge. However, there are few suspension bridges with this structure, and the structure is complex and orthotropic plates are crisscrossed, how to simplify the calculation needs further study. In view of the above problems, this paper mainly through the following aspects of the slab truss bridge deck stiffening beam analysis: (1) the different combination of truss stiffening beam calculation and analysis, This paper studies the difference and similarities of the mechanical properties of stiffened beams of plate-truss and split-type deck systems, calculates and analyzes the slab-truss composite deck systems with different steel deck support modes under the first system load and deck load. In order to study the reasonable structure and mechanical properties of slab-truss composite deck system. (2) the method of equivalent shear thickness of common truss is applied to the slab-truss composite deck system of suspension bridge, and the continuous program of truss beam is compiled. The effects of rigid joints and shear deformation on the internal force displacement of the structure are discussed. A reasonable simplified model is proposed for the whole calculation of stiffened beam of slab-truss composite deck system. (3) the shear lag variation law in the whole bridge range of slab-truss composite deck system of suspension bridge is obtained. Based on this, the longitudinal displacement function of slab truss combined bridge deck system is discussed. On the basis of continuous truss beam, the analytical solution of shear lag differential equation of simply supported beam subjected to uniform load and concentrated load is obtained by using variational method. In this paper, a method for calculating and analyzing the shear lag of slab-truss combined deck system of suspension bridge based on the influence interval of discrete slings force and bending moment is proposed, and its influence parameters are discussed. (4) considering the limitation of variational method, Based on the energy method and the virtual work increment equation, the elastic stiffness matrix and geometric stiffness matrix of beam element considering shear deformation and shear lag are derived in detail in this paper, and the relative programs are compiled, and the accuracy of the program is verified by comparing with ANSYS. Through the analysis and research in this paper, the mechanical characteristics of stiffened beam of slab-truss combined deck system of suspension bridge are obtained, the reasonable simplified model of conversion beam method and the calculation and analysis method of shear lag are obtained. The research in this paper shows that the stiffening beam of slab truss combined with bridge deck system is complicated, so different simplified models can be selected according to different mechanical characteristics. Considering the influence of rigid joints and shear deformation, the calculation accuracy can be improved by using the conversion beam method, and the shear lag analysis method based on the influence interval of discrete sling force and bending moment is proposed in this paper. The solution of shear lag of stiffened beam of suspension bridge has the advantages of clear physical concept, easy to program and high precision, but the method is limited by the solution of differential equation of shear lag. The finite element method of shear lag one-dimensional beam proposed in this paper based on interpolation function is more convenient.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441;U448.25

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本文編號(hào)：2086290