摘要
为深入了解无粘结预应力梁的抗震性能,本文基于我国现行规范设计了3根无粘结预应力混凝土梁和1根普通钢筋混凝土梁,并对其进行了拟静力试验。试验采用混合加载模式,由试验测得的力–位移数据得到预应力梁的滞回曲线、骨架曲线,试验结果分析表明:与普通钢筋混凝土梁相比,预应力混凝土梁滞回环面积、极限位移相对较小,延性相对较差,抗震性能也相对较差;在此基础上,以OpenSees为分析平台,基于纤维梁柱单元对4根试验梁及其拟静力试验进行数值建模分析,建模时考虑预应力筋与混凝土的耦合作用,并绘制其滞回曲线,数值分析与试验结果的对比分析表明:采用不同的钢筋和混凝土本构模型,对试验梁的分析结果具有比较大的影响,经过合理建模的数值试验,在一定程度上替代真实试验具有可行性。
In a gesture to better understand seismic performance of unbondedprestressed concrete, pseudo static test was carried out with 3 unbounded prestressed concrete beam and 1 reinforced concrete beam based on the current seismic code in China, using the mixed loading model. The force-displacement data were obtained for hysterefic curves and skeleton curves of the prestressed beams, which shows relatively poor ductility and seismic performance with smaller area of hysteretic curve, as well as limit displacement, compared to reinforced concrete. In addition, numerical model of 4 specimens and test procedure was established using fiber element based on the OpenSees platform, considering coupling effect of prestressed steel and concrete. The hysteresis curves were also obtained. Comparing different combinations of constitutive model of steel and concrete, the result of experiment and numerical calculation shows a few differences, and it is feasible to use numerical calculation instead of the traditional experiment to some extent.
作者
张耀庭
刘牧明
李双林
罗西
范世磊
张富成
ZHANG Yao-ting LIU Mu-ming LI Shuang-lin LUO Xi FAN Shi-lei ZHANG Fu-cheng(School of Civil Engineering and Meehanies, Huazhong University of Seienee and Teehnology, Wuhan 430074, Chin)
出处
《土木工程与管理学报》
北大核心
2017年第4期1-6,13,共7页
Journal of Civil Engineering and Management
基金
国家自然科学基金(51278218)
关键词
无粘结预应力混凝土梁
拟静力试验
数值计算
滞回曲线
unbondedprestressed concrete beam
pseudo static test
numerical calculation
hysteretic curves
