Comparative Analysis of Shear Strength Models in Plastic Hinge Region for Concrete Hollow Piers
SHAO Changjiang1,2, QI Qiming1, WEI Wang1, HU Chenxu1
1. Scholl of Civil Engineering，Southwest Jiaotong University，Chengdu 610031，China; 2. National Engineering Laboratory for Disaster Prevention Technology in Land Transportation，Southwest Jiaotong University，Chengdu 610031，China
Abstract：Accurate evaluation of shear strength in plastic hinge region is of great significance for seismic design of long-span bridges with tall piers. However，the shear design models for hollow piers are not directly listed in the current codes in China and abroad. The applicability of both the existing formulas for solid piers in the codes and the formulas for solid or hollow columns in literature needs to be further studied. Thus，based on the test results of 25 hollow piers with shear or flexural-shear failure modes，the influencing factors of shear strength in plastic region are analyzed，and the experimental values of shear strength are compared with the calculation results of 15 formulas. The results show that the shear strength of concrete hollow piers increases with an increase in concrete strength，stirrup ratio and axial load ratio，and decreases with an increase in displacement ductility factor and aspect ratio within a certain range，while the influence of the longitudinal reinforcement ratio is not significant. The errors between the test results and the calculated values by formulas of Aschheim，Caltrans，Sezen and Shin are all less than 5%，among which the Sezen model is the most suitable to assess the shear strength in plastic hinge region for hollow piers. The formulas in NZS3101，JRA， JTG/TB 02-01—2008，Eurocode 8，and ACI-318 lead to slightly conservative results，which can be used for shear design of hollow piers；the rest of equations，for overestimation of the shear strength in plastic hinge region，are inappropriate to concrete hollow piers.
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