波形钢腹板箱梁桥的荷载横向分布系数研究

发布时间：2018-03-17 13:31

本文选题：波形钢腹板　切入点：横向分布系数　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：箱梁截面具有良好的抗弯和抗扭性能,将混凝土腹板替换成波形钢腹板,不仅可以减轻自重,而且提高了预应力利用率。波形钢腹板箱梁良好的受力性能,使其在中小跨径梁桥中得到广泛应用,出于施工、宽度以及美观要求,山区桥梁和城市桥梁多采用多箱单室截面。鉴于此,本文结合波形钢腹板的受力特征,对多箱单室桥梁的荷载横向分布系数展开了研究,主要的工作包括：1、采用刚性横梁法和刚接梁法计算现有波形钢腹板箱梁桥的跨中截面的荷载横向分布系数,并利用有限元方法对以上两种方法的适用性进行验证,验证结果表明,刚性横梁法具有较大误差。利用杠杆原理法计算支座截面处的荷载横向分布系数,通过与有限元相对比,杠杆法适用于波形钢腹板箱梁支座处横向分布系数计算。2、采用有限元方法研究了横向分布系数沿跨度的变化规律,结果表明,对于波形钢腹板简支箱梁桥,支点处横向分布系数需要利用杠杆法计算,1/32L-31/32L之间截面可以近似取跨中截面代替,从支点到1/32L之间截面呈直线过渡。3、基于能量变分法,考虑波形钢腹板箱梁的约束扭转效应,推导得到荷载横向分布影响线的计算公式。并建立空间有限元模型对理论公式进行验证,结果表明理论公式具有较高的精度。4、利用推导公式与有限元计算结合的方法,研究分析了波折形状、横隔板间距、板厚以及腹板倾角对横向分布系数的影响。波折形状参数对横向分布系数的影响较小；横隔板可以使横向分布更均匀,并可以减小截面的畸变效应；板厚的增加可以有效提高截面抗扭刚度,减小主梁的横向分布系数；腹板倾角的变化主要影响顶底板宽度,且腹板倾斜对提高抗扭刚度有利,从而影响抗扭性能和横向分布系数。
[Abstract]:The section of box girder has good flexural and torsional properties. Replacing concrete web with corrugated steel web can not only reduce the weight of the box girder, but also improve the utilization ratio of prestressing force. It is widely used in medium and small span girder bridges. In order to meet the requirements of construction, width and beauty, multi-box single-chamber sections are used in mountain and urban bridges. In view of this, this paper combines the mechanical characteristics of corrugated steel webs. In this paper, the load transverse distribution coefficient of multi-box single-chamber bridge is studied. The main work includes the calculation of load transverse distribution coefficient of the middle section of the existing corrugated steel web box girder bridge by using the rigid beam method and the rigid-connected beam method, the main work of which is to calculate the load transverse distribution coefficient of the middle section of the existing corrugated steel box girder bridge. The applicability of the above two methods is verified by the finite element method. The results show that the rigid beam method has great error. The transverse load distribution coefficient at the support section is calculated by the lever principle method, and the results are compared with the finite element method. The lever method is applicable to the calculation of transverse distribution coefficient at the support of corrugated steel web box girder. The variation law of the transverse distribution coefficient along the span is studied by using finite element method. The results show that, for the simple box girder bridge with corrugated steel web, The transverse distribution coefficient at the fulcrum needs to be calculated by lever method between 1 / 32L-31-1 / 32L cross-section can be approximately replaced by mid-span section, and the cross-section from fulcrum to 1/ 32L is a straight line transition. Based on the energy variation method, the constrained torsional effect of corrugated steel web box girder is considered. The formula for calculating the influence line of transverse load distribution is derived, and the theoretical formula is verified by establishing the spatial finite element model. The results show that the theoretical formula has a high precision of .4.The method of combining the derived formula with the finite element calculation is used. The effects of the shape of the corrugated plate, the spacing of the transverse partition, the thickness of the plate and the inclination angle of the web plate on the transverse distribution coefficient are studied and analyzed. The influence of the shape parameters of the corrugated shape on the transverse distribution coefficient is small, and the transverse partition can make the transverse distribution more uniform. It can also reduce the distortion effect of the section, increase the thickness of the plate can effectively increase the torsional stiffness of the section and decrease the transverse distribution coefficient of the main beam, the change of the inclination angle of the web mainly affects the width of the top and bottom plate, and the inclination of the web plate is beneficial to the improvement of the torsional stiffness. Thus the torsional resistance and transverse distribution coefficient are affected.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.213

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