空心板桥拓宽后新旧板耦合受力

赵宝俊+谢路+朱郭瑞+孟江

摘要：为了研究拼接拓宽空心板桥梁荷载横向传递及内力变形规律，建立有限元模型，对桥梁新旧板刚接和铰接连接形式下耦合受力情况进行分析，研究不同连接形式对新旧板整体受力的影响。结果表明：采用不同连接形式拓宽后，旧桥各板的横向分布系数均低于原板，即拓宽后旧空心板仍起控制作用，但其整体受力性能得到提高；拓宽后侧边板内力和挠度比中板大，且新板内力和挠度比旧板小；空心板桥梁采用刚接形式拓宽时，结构整体刚度的提升高于铰接形式的；随着耦合刚度增大，桥梁整体刚度增大，弯矩和挠度降低逐渐明显，跨中顶缘压应力减小，底缘拉应力增大；从结构整体受力和结构性能角度来看，刚接形式的新旧板顶缘压应力比铰接形式的小，且完全刚接的连接方式受力更合理。

关键词：桥梁工程；空心板桥；拓宽；耦合受力；连接形式

中图分类号：U443.3文献标志码：A

Analysis on Coupling Force of New and Old Beams After Widening

Hollow Slab BridgeZHAO Baojun1，2， XIE Lu2， ZHU Guorui2， MENG Jiang1

（1. Post Doctoral Research Station of Transportation Engineering， Changan University， Xian 710064， Shaanxi，

China； 2. Shaanxi Provincial Communication Construction Group， Xian 710075， Shaanxi， China）Abstract： In order to study the effect of lateral load transfer and deformation rules of widening hollow slab bridge， the finite element model was established to analyze the new and old connection coupling force in different ways （hinged or rigid）， and the influences of different connections on the force of the new and old boards were studied. The results show that after using different connection form to widen， old bridge transverse distribution coefficient of each plate is lower than that of the original plate， it is showed that old plate still plays a controlling role after widening， but the overall mechanical performance is improved. The force and deflection of side plate is larger than that of the internal plate， and the force and deflection of new internal plate is smaller than that of the old one after widening. When hollow slab bridge is widened using rigid connection， the rise of the overall rigidity of the bridge is larger than that using hinged connection. With the increase of coupling stiffness， the overall rigidity of the bridge increases， bending moment and deflection decrease clearly， the top edge compressive stress decreases， and bottom flange tensile stress increases. In the view of structure stress and the overall structure properties， the compressive stress of the top edge is smaller than that using rigid connection， and fully rigid connection form of stress is more reasonable.

Key words： bridge engineering； hollow slab bridge； widening； coupling force； connection form

0引言

加宽后桥梁横向主梁数量增多，改变了原桥横向荷载传递规律，新旧主梁刚接和铰接的不同连接方式对荷载的横向分布有较大的影响，使单梁内力发生较大变化[12]。本文以不同拼接构造的简支空心板桥为例，对荷载横向传递规律及内力变形定量分析[3]，研究不同连接方式对新旧简支空心板梁整体受力的影响。新旧板连接后会在连接处产生相同的变形，因此，荷载作用后可以看作新旧板为耦合受力[45]。

1空心板梁桥拼接构造