横向钢板加固对空心板桥受力影响研究

Study on Effect of Transverse Steel Plate Reinforcement on Stress of Hollow Core Slab Bridge

为了探究铰接空心板桥横向加固后的横向受力分配变化及其计算方法,引入横向受力分配比的概念,对某简支空心板加固前后的荷载试验数据与铰接板法及修正刚接板法的理论计算结果对比,发现通过横向受力分配比实测值与计算值对比可以清晰展示单板受力现象,但实测数据形成的趋势线很不平滑;因此,引入横向受力分配增长值作为参数进行分析。虽然桥面现浇层及横向钢板加固增强了横向刚度,但实测横向受力分配比与按铰接板法的计算值吻合更好,说明铰接板法理论可以满足此类桥梁加固前后的横向分布计算。

In order to study the transverse distribution change of hollow core slab bridge after reinforcement by transversal steel plate, a simply supported hollow core slab bridge was employed as an example. The field load test data of the bridge before and after reinforcement were compared with the theoretical results by hinged-joint slab method and modified rigid-joint slab method. It is found that the phenomenon of ‘single plate load effect’can be clearly displayed by comparing the measured and calculated values of the transverse distribution ratios.As the trend line formed by the measured data was not smooth, the relative transverse distribution growth value was introduced in the paper. Although the cast-in-situ deck and transverse steel plate reinforcement enhanced the transverse stiffness, the measured transverse distribution ratios were in good agreement with the calculated values according to the hinge-jointed slab method. The results show that the theory of hinge-jointed slab method can meet the transverse distribution calculation before and after the strengthening of such bridges.