论文部分内容阅读
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。
In order to study the influence of simplified modeling method on the analysis of the mechanical behavior of hollow slab bridges, taking the 20 m fabricated hollow slab bridge as the background, considering the lateral connection of hollow slab and the decking of the bridge deck, Shell combination and articulated beam. The dynamic characteristics, the static response and the vibration responses of the bridge and bridge coupling are analyzed. The numerical results are compared with those of the test. The results show that the first-order and second-order frequencies of beam-shell combination model are closer to the measured values. Under the single-vehicle load, the strain and displacement of each sheet-span beam changes transversely, and the beam-shell combination model is more consistent with the measured value. Under the action of the effective load, the bridge deck pavement, concrete joint slot joint and hollow slab bridge take part in the joint force, and there is no crack in the hollow slab bridge, and the mid-span displacement and lateral strain change. The beam-shell combined model is closer to the measured value; In theoretical displacement impact coefficient, the hinge beam model is larger than the beam shell combination model, the measured impact coefficient is closer to the beam shell combination model. Beam-shell composite model can reflect the deck slab deck bridge and concrete enterprises to participate in the stress. In the design of Xinqiao, it is suggested that the hollow slab bridge should be properly considered for the deck pavement and concrete joint slot joints.