基于模型试验的RC墩柱抗震加固方法比较

Comparison of Seismic Retrofit Measures for RC Bridge Columns Based on Model Test

目前,国内外针对RC墩柱已开发了一些有效的抗震加固方法。然而,对这些抗震加固方法进行综合比较研究的报道较少。本文以国内1970~80年代建造的公路桥梁中典型RC墩柱为样本,设计制作了8座大比例尺RC墩柱模型,分别采用粘贴纤维复合材料加固法（包含粘贴碳纤维布、芳纶纤维布和玄武岩纤维布3种加固技术）、外包钢管加固法、增大截面加固法、外粘型钢加固法以及复合加固法（外包角钢与玻璃纤维布复合加固技术）等5种方法对其中的7座模型进行了抗震加固,并通过拟静力试验对各抗震加固技术进行了验证;同时,从技术性能指标方面对5种抗震加固方法进行了综合比较。结果表明,外包钢管加固法对RC墩柱的延性提高最大,增大截面法对承载力提高最大,而粘贴玄武岩纤维布的加固方法总体表现较优。

Several effective seismic retrofit measures for RC bridge columns have been developed currently. However,few literatures have been reported on the comprehensive comparison of these seismic retrofit measures. Based on the typical columns of the highway bridges built in the 1970- 80 s in China,8 large-scale RC bridge column models are designed and built,and 7 of the seismic are model retrofitted by the measures of CFRP jacket,AFRP jacket,basalt fiber composite（ BFRP） jacket,steel jacket,concrete jacket,bonded steel frame jacket,and combined bonded steel frame and GFRP jacket,respectively. The seismic performances of the retrofitted models are verified by quasi-static tests,and the different seismic retrofitted measures are comprehensively compared from technical aspect. The results show that,among the seismic retrofit measures,steel jacket is the best one for improving the ductility,and concrete jacket is the best one for improving the bearing capacity of a RC bridge column,and the measure of BFRP jacket is the overall best one.