简化建模方法对空心板桥力学性能的影响

发布时间：2018-03-07 17:17

本文选题：桥梁工程　切入点：空心板梁桥　出处：《公路交通科技》2014年12期 　论文类型：期刊论文

【摘要】：为研究简化建模方法对分析空心板桥受力特性的影响,以20 m装配式空心板桥为背景,考虑空心板横向连接及桥面铺装参与受力,运用ANSYS建立空心板桥的梁壳组合和铰接梁2种有限元模型,分析空心板桥动力特性、静载响应及车桥耦合振动响应,并将数值结果与试验对比。研究结果表明,梁壳组合模型的一、二阶频率与实测值更为接近;单车荷载作用下,各片梁跨中应变和位移横向变化,梁壳组合模型与实测值更吻合;承载能力等效荷载作用下,桥面铺装、混凝土企口缝与空心板桥共同参与受力,空心板桥未出现裂缝,且跨中位移和应变横向变化,梁壳组合模型与实测值更接近;跨中理论位移冲击系数,铰接梁模型大于梁壳组合模型,实测冲击系数与梁壳组合模型更接近。梁壳组合模型能体现空心板桥的桥面铺装及混凝土企口缝参与受力。新桥设计时,建议空心板桥适当考虑桥面铺装及混凝土企口缝参与受力。
[Abstract]:In order to study the influence of simplified modeling method on the mechanical characteristics of hollow slab bridge, taking the 20m assembled hollow slab bridge as the background, the transverse connection of hollow slab and the bridge deck pavement are considered. Two kinds of finite element models of beam and shell combination and articulated beam of hollow slab bridge are established by using ANSYS. The dynamic characteristics, static load response and vehicle-bridge coupling vibration response of hollow slab bridge are analyzed, and the numerical results are compared with the experimental results. The first and second order frequency of the combined beam-shell model is closer to the measured value; under the action of single cycle, the lateral variation of the strain and displacement in the span of each piece of beam is more consistent with the measured value; under the equivalent load of load-bearing capacity, the bridge deck is paved. The concrete joint and hollow slab bridge take part in the force together, the hollow slab bridge has no crack, and the lateral change of the displacement and strain in the span, the combination model of beam and shell is closer to the measured value, the impact coefficient of the theoretical displacement in the span is more close to the measured value. The beam-shell composite model is larger than the beam-shell composite model, and the measured impact coefficient is closer to the beam-shell composite model. The beam-shell composite model can reflect the bridge deck paving of hollow slab bridge and the joint of concrete joint. It is suggested that the bridge deck pavement and concrete opening joint should be considered properly.
【作者单位】：东南大学交通学院;华东交通大学土木建筑学院;
【基金】：国家自然科学基金项目(51268013、51468018) 江西省自然科学基金项目(20114BAB216008) 江西省教育厅科研项目(GJJ14384、GJJ14352) 教育部工程研究中心开放基金资助项目(13TM02)
【分类号】：U441

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