【摘要】 对4个钢筋混凝土箱形高墩模型,开展了拟静力试验研究,主要的试验参数包括墩高和配箍率。通过夹式引伸计,监测了裂缝开展的全过程,进而研究了残余裂缝随结构损伤的发展状况,指出在位移控制加载中采用位移回到零点时的裂缝宽度会严重低估结构的残余裂缝。观测了混凝土压溃、严重剥落以及相应的变形指标,并基于PEER数据库及部分相关试验结果进行了对比验证。试件的最终破坏均为纵筋断裂,分别采用Priestley和Berry的等效塑性铰长度计算公式并与试验结果进行了对比,结果表明Berry公式对高墩的符合性较好。更多还原

【Abstract】 Four tall reinforced concrete piers with hollow rectangular section were tested by static cycle loading.The test variables included column height and transverse reinforcement ratio. The entire progression of the cracking was monitored by using clip-on gage and therefore residual crack width was investigated. It is pointed out that is the crack width was measured at the end of a displacement cycle when the specimen was totally re-centered,we would substantially underestimate the residual crack. Concrete crushing and spalling were also observed and the corresponding drift ratios were compared with similar experimental results selected from the PEER database and also from some literatures. Finally,all the specimens were found failed with the fracture of longitudinal reinforcement. Both the equations proposed by Priestley and by Berry for the calculation of the equivalent plastic hinge length were used for an analytical prediction of the ultimate displacement capacity and the results show that the equation presented by Berry seems to be more reasonable for tall piers.更多还原