钢纤维混凝土局部增强桥墩抗震性能试验研究  

Tests for aseismic behavior of bridge piers with local steel fiber reinforced concrete

作　　者：张于晔[1] 魏红一[1] 袁万城[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《振动与冲击》2012年第21期102-107,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(50978194;51278376;90915011)

摘　　要：为分析钢纤维体积率、钢纤维混凝土增强区域长度以及配箍率等因素对钢纤维混凝土桥墩抗震性能的影响,对考虑以上三个设计参量的八个桥墩试件进行了低周反复荷载作用下的拟静力试验,并探讨了钢纤维混凝土桥墩试件破坏形态、滞回特性、骨架曲线、延性性能和耗能能力等抗震性能。结果表明:钢纤维体积率为1.0%的桥墩试件较其他体积率的试件承载力更大,滞回曲线相对更加饱满,延性性能更好;钢纤维可以代替部分箍筋作用,在较低配箍率下保持良好的抗震能力;在桥墩潜在塑性铰区域局部合理地采用钢纤维混凝土,可达到与桥墩整体采用钢纤维混凝土相近的极限承载力、刚度、延性和耗能能力。最后提出了简化计算公式用以估算在单柱式桥墩中局部使用钢纤维混凝土的合理长度,并通过试验结果验证了其精度。Tests for aseismic performance of bridge piers under low reversed cyclic loading were conducted using 8 bridge pier specimens with local steel fiber reinforced concrete （SFRC） , the effects of three main parameters including fiber volume content, length of SFRC region and stirrup ratio were analyzed. Aseismic performance of SFRC pier specimens, such as, failure pattern, hysteretic characteristics, skeleton curves, ductility, and energy dissipation were studied. The results showed that the SFRC pier with fiber volume content of 1.0% is better in bearing capacity, hysteretic energy dissipation and ductility than piers with other fiber volume contents; the pier specimen can keep sufficient aseismic capacity when some stirrups are replaced by steel fiber; with appropriate local application of SFRC in its potential plastic hinge region, the pier is able to sustain almost the same behaviors in ultimate bearing capacity, stiffness, ductility and energy dissipation capacity as those of a pier with application of SFRC in its entire body. A simplified formula was proposed for calculating the reasonable length of SFRC region, and the calculation accuracy of the formula was verified by the test results.

关 键 词：钢纤维混凝土 桥墩 低周反复荷载试验 抗震性能 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] TU528.572[交通运输工程—道路与铁道工程]