波纹钢腹板组合箱梁桥剪力滞研究

发布时间：2018-01-16 10:48

本文关键词：波纹钢腹板组合箱梁桥剪力滞研究　出处：《中南林业科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文以深圳市新安大桥(88m+156m+88m)为工程背景,用能量变分法和有限元分析两种方法对大跨波纹钢腹板PC箱梁的剪力滞效应进行了综合分析研究。推导了在不同荷载作用下用能量变分法计算剪力滞系数的公式,认为能量变分法是剪应力不均匀分布理论求解中较有效的方法,能够对大跨径波纹钢腹板-混凝土组合截面宽箱梁的剪应力沿截面的分布进行求解。建立了Midas/civil和ANSYS对新安大桥实桥的有限元模型,用有限元分析计算结果和能量变分法理论求解的结果进行了比较,二者计算结果基本相近,但有限元计算结果小于能量变分法求解结果,在对于大跨径波形钢腹板组合截面梁桥中的剪力滞系数的计算方法中,有限元方法的计算结果比能量变分法更加严谨；在Midas/civil和ANSYS两种有限元软件共同分析中,Midas/civil在对实桥分析更快捷,明确,能更好把握结构从施工到完成的整个过程分析,而ANSYS分析中能对结构中的细部构件进行更细致入微的计算；计算得出波形钢腹板组合截面连续梁桥在悬臂施工阶段和成桥后支座处截面都存在较为明显的剪力滞效应。分析得出大跨径的波形钢腹板组合箱梁桥在不同荷载作用下,截面顶、底板都出现了较为明显的剪力滞效应,且验证了大跨径的波形钢腹板组合箱梁桥中,最大剪力滞系数往往出现在截面剪力连接件附近的截面板上；计算得出在跨径大、截面宽度宽的组合箱梁结构中,沿梁高方向正应变主要体现在顶、底板位置,腹板应变几乎为零,所以大跨径波形钢腹板组合宽截面不符合“平截面假定”。改变波形钢腹板组合截面桥不同几何尺寸参数,分析其对剪应力分布规律的影响,当跨径不变截面宽度增大时,波形钢腹板组合截面桥的最大剪力滞系数逐渐增大,而且荷载越大,剪力滞效应随宽跨比的增大而变化得明显；不同波高使得最大剪力滞系数的变化趋势在不同荷载作用下大致一样,而集中荷载的作用下,波纹钢板的波高变化往往比均布荷载作用对剪力滞系数的影响更大。本文的计算分析结果对于同类桥型设计有一定的参考意义。
[Abstract]:The background of this paper is 88 m 156m 88m of Xinan Bridge in Shenzhen City. The shear lag effect of PC box girder with long-span corrugated steel webs is studied by means of energy variational method and finite element analysis. The common method of calculating shear lag coefficient by energy variational method under different loads is derived. Style. It is considered that the energy variational method is an effective method to solve the non-uniform distribution of shear stress. The shear stress distribution along the cross-section of large-span corrugated steel web-concrete composite section wide box girder can be solved. The finite element model of Midas/civil and ANSYS for the real bridge of Xin'an Bridge is established. . The results of finite element analysis and energy variational method are compared. The two results are basically similar, but the results of finite element method are smaller than that of energy variational method. In the calculation method of shear lag coefficient of long-span corrugated steel web composite beam bridge, the result of finite element method is more rigorous than that of energy variational method. In the Midas/civil and ANSYS finite element software analysis, Midas / civil analysis of the bridge is faster and clearer. Can better grasp the structure from construction to completion of the whole process of analysis, and ANSYS analysis can be more detailed calculation of the details of the structure; The results show that the shear lag effect is obvious in the cantilever construction stage and at the rear support of the continuous girder bridge with corrugated steel web composite section. The analysis shows that the long-span composite box girder bridge with corrugated steel web plate has different loads. Under the influence. At the top and bottom of the section, the shear lag effect appears obviously, and it is verified that the maximum shear lag coefficient often appears in the section panel near the section shear joint in the long-span corrugated steel web composite box girder bridge. The results show that in the composite box girder structure with large span and wide section width, the positive strain along the beam height is mainly reflected in the top, bottom plate position, and the web strain is almost zero. Therefore, the wide section of long-span corrugated steel web is not in accordance with the "plane section assumption". The influence of different geometric parameters on the shear stress distribution of the bridge is analyzed by changing the geometric parameters of the bridge. When the span width is constant, the maximum shear lag coefficient increases gradually, and the larger the load, the more obvious the shear lag effect changes with the increase of width span ratio. Different wave heights make the variation trend of the maximum shear lag coefficient approximately the same under different loads, but under the action of concentrated load. The variation of wave height of corrugated steel plate is usually greater than that of uniform load on shear lag coefficient.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.213

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