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基于薄壁理论的工程结构复合弯扭相关性研究【作者】涂启华 【导师】胡少伟

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N0eM*o?JZA0基于薄壁理论的工程结构复合弯扭相关性研究水利论文Gs!x}N|9t#@A

r5Cdl.g0【作者】涂启华 【导师胡少伟
&XOn-yk/U,Oi)P&@Z0【作者基本信息】南京水利科学研究院,水工结构工程,2007年,硕士

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6| Z9p!L\ p:w0【中文摘要】 薄壁结构构件由于其受力性能良好、质量轻、节约材料而在水利、交通和土木工程上得到广泛的应用。实际薄壁结构构件往往处于弯剪、弯扭、弯剪扭等复合受力状态,在动力荷载或地震荷载作用下,薄壁结构的破坏大都是弯、剪、扣的不同组合引起的。在我国,构件的抗扭研究是一个开展较晚的课题,目前对薄壁构件在复合弯扭作用下性能的掌握程度尚不很成熟,还有需要开展更深入的研究,因此,本文选取在交通工程和水利工程中典型的薄壁结构——组合桥梁和大型渡槽在弯扭复合受力状态下的相关性进行研究。主要做了以下几个方面的工作:(1)本文总结了钢筋混凝土受扭理论、薄壁构件复合弯扭的研究进展,并对相关国家规范进行综述,介绍了薄壁构件数值计算中常用的计算方法,提出了薄壁构件复合受力研究中有待解决的问题和选题的工程背景及实际意义。(2)基于大型通用有限元软件—ANSYS,应用其二次开发工具—APDL参数化设计语言,编写了相应的分析命令流,对开/闭口薄壁组合梁在弯矩作用下考虑界面滑移的受力性能进行非线性全过程分析,并借助Tecplot后处理软件,将求解的结果采用Tecplot的OpenGL渲染技术直观、形象显示出来,计算结果表明:在条件许...更多可的情况下,采用闭口截面组合梁将大大提高结构构件的承载能力。(3)基于薄壁理论,采用广义坐标法,推导了考虑截面外形轮廓线变形的薄壁箱梁约束扭转微分方程,借助Fortran算法语言,编制了COLSYS常微分方程求解主程序并进行分析,并将结果导入Tecplot后处理软件,实现了结果的二维、三维彩色出图。同时基于ANSYS软件,选用考虑翘曲梁单元,对薄壁箱梁在扭转荷载作用下进行计算分析;并与文献采用初参数法进行比较,算例计算结果表明COLSYS程序具有使用方便、精度高的特点。(4)通过给定广义坐标,推导了闭口截面薄壁组合梁约束扭转有关求解计算的微分方程组,结合有限元线法(FEMOL)的常微分方程(ODEs)求解器COLSYS软件包,编制相应的计算主程序,对其复合受力进行计算,并与试验和其它有关理论计算结果进行了比较分析,得到了闭口截面薄壁组合梁弯扭复合受力的相关性曲线及其方程。(5)针对大型渡槽作为薄壁结构的实际,选取南水北调工程某大型渡槽作为研究对象,对箱型/U型断面两类薄壁渡槽槽身在弯扭复合受力下的性能进行分析,通过数学分析软件Origin7.0拟合得到渡槽弯扭相关性曲线,并对两种槽身断面的复合受力弯扭相关性进行比较分析,得到了大型渡槽的相关性方程。(6)对同属于薄壁结构的闭口截面组合梁与渡槽在弯扭复合受力相关性进行比较分析表明:在弯扭复合受力下,扭弯比T/M是影响其弯扭破坏形态的重要因素。当扭弯比较小时,弯矩起主要作用,构件一般呈现弯型破坏;当扭弯比较大时,构件受力以扭矩为主,一般为扭型破坏。但由于两种结构组成不同,闭口截面组合梁的弯矩提高极限扭矩和扭矩提高极限弯矩的效应要比渡槽的明显。通过对组合箱梁和大型渡槽弯扭相关性的研究,得到了其相关性方程,对有关异同进行了分析比较,研究成果对薄壁结构构件工程设计具有一定的参考价值,为规范的制定提供了借鉴。  还原水利论文%J'k6C"Ff.e$t

c.ND6Y(W3S(q0【英文摘要】 Thin-walled reinforced concrete structures have many advantages suchas good mechanical performance, light weight and low cost, so they havebeen extensively applied in water conservancy, traffic engineering andcivil engineering. But they are usually under combined load cases suchas bend-shear, bend-torsion, bend-shear-torsion, destructions ofthin-walled structures are often caused by the combination of bend, shearand torsion under dynamic loading. Research on torsional structure in ourcountry is a later subject, and at present, the characters of thin-walledstructure members under combined torsion is not fully understood, sofurther research into this field is needed. This paper selected typicalthin-walled structures in traffic engineering and hydraulicengineering—composite bridges and large scale aqueducts, and study onthe combined loading relativity of it under bending moment and torsion,the main points of this paper are as follows:(1) In this paper, corresponding national criterion, cu...更多rrent torsiontheories of reinforced concrete and thin-walled structure members weresummarized. Numerial methods of thin-walled structure members wereintroduced. No settled questions exist in thin-walled members undercombined loading, the engineering background and effective value of theselected topics were presented.(2) Based on FEM software (ANSYS) and secondary development tool-ANSYS Parametric Design Language (APDL), corresponding command flowprograms were compiled. Considered interface slip, full-range nonlinearanalysis of thin-walled composite beams with open/box section underbending moment was finished, and the Tecplot post-processing software wasapplied, which uses OpenGL technique, the solution results were revealedintuitionistically and vividly. Results show that box-section compositebeam will greatly increase structures' ultimate bearing capacity. (3) Based on thin-walled theory, using generalized coordinate method,the differential equations for restrained torsion of thin-walled boxsection girder considering the outline deformation was derived. AppliedFORTRAN arithmetic language, corresponding calculate main programs weresuccessfully compiled by using the solver of ordinary differentialequations (ODEs) -COLSYS. The results were input into post-processingsoftware -Tecplot, and output in 2D/3D multicolor status. Based on ANSYSsoftware, selecting included shear deformation 3D beam element, theanalysis of the thin-walled box girder under torsion loading was finished,and the results were compared with corresponding reference. The resultsshow that COLSYS program has the characters of convenience and highprecision.(4) With prescribed generalized coordinate and reasonableassumptions, the differential equation system for restrained torsionanalysis of box-section composite beam was established based on theprinciple of generalized coordinate method, corresponding main programswere compiled using FORTRAN arithmetic language, the solver of ordinarydifferential equations (ODEs)-COLSYS was employed to solve the equationsystem, and the relativity curve and corresponding equations were gainedby comparing the results with the test and theoretical analysis ofcorresponding references.(5) AS a type of thin-walled structures, large scale aqueducts wereselected from Water Transfer Project from South to North of China. Theanalysis of box/U type section thin-walled aqueduct under combinedbending and torsion loading were finished and bending-torsion relativitycurves and equations of the aqueduct were gained through mathematicsanalysis software-Origin7.0. Finally, the two type section aqueductcombined loading relativity was compared.(6) Both relativity compared box-section composite beams withlarge-scale aqueducts under bending-torsion, the results show that:under combined flexure and torsion, the ratio of torsion to bending moment is the main factor for their destruction. When the ratio of torsion tobending moment is small, the bending moment played an important role onthe destruction of structure components, and presents failure withflexural, in contrast, when the torsion has a leading effect on thedestruction of structure components, and presents failure with torsionalfeature, box-section composite beams have obvious effect on bendingmoment increases ultimate torsion and torsion increases ultimate bendingmoment.The interaction equations are gained through the relativity researchon box-section composite beam and large scale aqueduct under bending andtorsion, and results were compared, the results of this paper can providereferences to the design of thin-walled reinforced concrete structuresand the establishment of national specification.  还原水利论文_yB-iH

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【中文关键词】 薄壁结构; 组合桥梁; 大型渡槽; 广义坐标法与COLSYS软件; 复合弯扭相关性
%@x P-BM,{0【英文关键词】 thin-walled structure; composite bridge; large scale aqueduct; generalized coordinate method and COLSYS program; combined loading relativity
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