采用不同下部结构形式的整体式无缝桥受力特征

发布时间：2018-06-04 03:17

本文选题：桥梁工程 + 整体式无缝桥　；参考：《建筑科学与工程学报》2017年01期

【摘要】：建立考虑桥台-土、桩-土相互作用的整体式无缝桥有限元分析模型,并选取下部结构形式、温度作用、台后填土性质以及桥梁跨径为研究参数,对比分析了采用不同下部结构形式的整体式无缝桥受力特征。结果表明:下部结构刚度越大,其对上部结构的约束作用越强,桥梁纵向整体性更明显,但对主梁梁端和桥台的受力越不利;当下部结构刚度较大时,温度对桥梁内力和变形的影响更明显;随着桥梁跨径的增大,整体温度作用的影响逐渐成为温度作用中的主要因素;当下部结构采用矮桥台与桩基础时,台后填土密实度对梁端和桥台弯矩以及主梁轴力的影响不明显;当采用墙式桥台时,随着台后填土密实度的增大,温度作用下主梁轴力会快速增大;随着桥梁跨径的增大,整体式无缝桥的内力不断增大,且当采用刚度较大的下部结构时增大的速率更快;若以桥台在正常使用极限状态下的混凝土裂缝宽度为控制目标,应对整体式无缝桥的最大桥长进行限制,且下部结构刚度越大,最大桥长的限制越严格。
[Abstract]:The finite element analysis model of integral seamless bridge considering the interaction between abutment and soil, pile and soil is established, and the substructure, temperature, the properties of backfill and the span of bridge are selected as the research parameters. The stress characteristics of integral seamless bridge with different substructures are compared and analyzed. The results show that the greater the stiffness of the substructure is, the stronger the constraint on the superstructure is, and the more obvious the longitudinal integrity of the bridge is, but the more disadvantageous is the stress on the beam end and abutment of the main beam, and when the stiffness of the substructure is larger, The effect of temperature on the internal force and deformation of the bridge is more obvious. With the increase of the span of the bridge, the effect of the whole temperature is gradually becoming the main factor of the temperature action, and when the substructure adopts the short abutment and the pile foundation, When the wall abutment is adopted, the axial force of the main beam will increase rapidly with the increase of the compactness of the backfill soil, and the axial force of the main beam will increase rapidly with the increase of the span of the bridge. The internal force of the integral seamless bridge is increasing continuously, and the increasing rate is faster when the substructure with high stiffness is adopted. If the width of concrete crack of abutment under the limit state of normal use is taken as the control goal, The maximum bridge length of integral seamless bridge should be restricted, and the greater the stiffness of the substructure, the more strict the limit of the maximum bridge length.
【作者单位】：长安大学公路学院;西安公路研究院;
【基金】：国家自然科学基金项目(51378068,51508027) 陕西省交通运输厅科研项目(14-19K,14-20K)
【分类号】：U441

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