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箱梁剪力滞效应的研究与影响因素分析(何光宇)

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:K JL4KqM"BInJ0【作者】何光宇 【导师】洪晓林水利论文8Jz$a,Rxi)}/l*n
【作者基本信息】南京水利科学研究院,水工结构工程,2005年,硕士水利论文f/p$k E&J B

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【中文摘要】 箱梁的剪力滞效应是桥梁等结构设计和分析中不可忽视的问题。然而,对箱梁剪力滞效应的影响因素还没有统一的定论,国内外现行设计规范对箱梁剪力滞的分析与计算没作具体的规定,只提出了T型梁翼缘有效宽度的经验取值方法,我国甚至只根据宽跨比规定了T型梁翼缘有效宽度。针对箱梁剪力滞效应研究不完善的现状,本文对箱梁剪力滞效应应用最小势能原理、有限元法和模型试验进行研究,并探讨了剪力滞效应的影响因素。主要研究内容包括: (1) 对箱梁剪力滞效应的研究现状进行了回顾、分析、比较和评价。 (2) 分析了箱梁剪力滞效应产生的原因,用最小势能原理推导出梯形截面箱梁的剪力滞效应的控制微分方程,并应用FORTRAN语言编制相应的计算程序。揭示出箱梁具有明显的纵向正应力分布不均匀的特征。 (3) 应用能量法、结构实验、及有限元法求解箱梁剪力滞效应,结果表明三种分析方法所得结论一致,影响箱梁剪力滞效应的主要因素是跨宽比和宽高比;另外,荷载作用形式对箱梁剪力滞效应也有一定影响。 (4) 提出一种新的分析预应力结构的模型:使用有初应力的空间杆单元来模拟预应力束,以独立建模耦合法为理论基础,建立体—杆耦合模型。应用APDL高级...更多语言对ANSYS进行二次开发,编制了预应力结构的分析程序。克服了ANSYS软件只能采用等效荷载法计算预应力混凝土结构的误差大的缺点,同时简化了有限元的建模过程。该方法在计算预应力结构方面具有相当大的使用价值。 (5) 通过预应力对箱梁剪力滞效应的影响因素分析,结果表明预应力钢束的弯起角是对剪力滞系数影响的主要因素,预应力钢束的锚固位置对剪力滞系数影响不敏感;在正常使用状态下,预应力平抑了箱梁剪力滞效应。 (6) 探讨我国现行设计规范,指出规范对剪力滞效应考虑的不足之处和对工程设计造成的影响,并提出修改建议。 这些成果对于完善箱梁的剪力滞效应的理论和具体应用具有重要价值。  还原

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Cz*VFu p3l-T0【英文摘要】 Shear lag effect of box girder is important problem in bridge structure designing and construction, however, the experiment calculation method of effective distribution width of flange plate of model T is not accordance with engineering. So, the factor of shear lag of box girder is researched by using the principle of the stationary value of the total potential energy, FEM and model test. In this paper, the main contents are as follows.1 Shear lag effect of box girder is reviewed in the paper.2 The reason of shear lag effect of box girder is analyzed. Differential governing equations of trapeziform box girder is yielded by using the principle of the stationary value of total potential energy. Taking shear lag into consideration, a program in FORTRAN language is revealed that the normal stress distribution is uneven markedly.3 Energy theory, model test and FEM are utilized to analysis shear lag effect of box girder. It is shown that width /span ratio and width/height ratio are the main ...更多factors, however, load styles are important factor.4 Basing on the theory of separate model for coupled method, 3-D spar element with initial stress is utilized to simulated prestressed cable. APDL program based on the ANSYS software for calculating prestressed concrete construction is designed. It is shown that the method is suitable for analysizing prestressed concrete construction for its precision.5 Prestressing is important factor for shear lag. Through parameters analysis, it is shown that the angle of prestressed cable is most important factor for shear lag effect of box girder, however, the placement of prestressed cable is insensitive. Shear lag is reduced for prestress in serviceability limit state.6 The deficiencies of the State Design Specification is discussed, furthermore, some advice is given in the paper.  还原水利论文 iNMC`0q6C K

V dg+ZK-^E2y?0【中文关键词】 箱梁; 剪力滞; 模型试验; 预应力; 体-杆耦合模型; 设计规范
SmZ7XM6Tq U-D9l(c0【英文关键词】 box girder; shear lag; model test; prestress; solid-spar coupled model; design specification
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TAG: 影响因素 何光宇 箱梁 剪力 效应
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