摘要
为探究PP-ECC梁与RC梁变形发展规律的区别,通过逐级加载和循环加载两种加载制度对4根PPECC梁和4根RC梁进行抗弯试验;同时,基于有效惯性矩法推导出适用于短期荷载作用下PP-ECC梁的最大变形计算公式.研究结果表明:逐级加载下,PP-ECC梁呈现出更为明显的塑性变形阶段,与RC梁相比,PP-ECC梁经过5次循环加载后的循环荷载变形曲线与原曲线拟合度较好;循环加载过程中,PP-ECC梁在基准荷载下的加载变形增长率和卸载变形增长率均小于相同配筋率的RC梁,呈现出更好的抗损伤变形能力和变形恢复能力;基于有效惯性矩法推导出的变形修正模型计算结果与试验结果拟合度较好,可应用于实际工程对PP-ECC梁在短期荷载作用下最大变形的计算.
In order to explore the difference in deformation behaviors of polypropylene engineered cementitious composite(PP-ECC)beam and reinforced concrete(RC)beam,bending resistance tests were performed on four PP-ECC beams and four RC beams using two loading systems,i.e.,step loading and cyclic loading.Meanwhile,based on the effective moment of inertia method,the maximum deformation calculation formula applicable to the PP-ECC beams under short-term loads was derived.The results show that the PP-ECC beam undergoes a more obvious plastic deformation stage under successive loading.Compared with the RC beam,the deformation curve of the PP-ECC beam after 5 cycles of cyclic loading fits better with the original curve.During cyclic loading,the growth rates of the loading and unloading deformation of PP-ECC beams under the reference load are both lower than those of RC beams with the same reinforcement ratio,showing better damage resistance and deformation recovery ability.In general,the calculated results of deformation correction model based on the effective moment of inertia method fit well with the test results,and the proposed method can be applied to the calculation of maximum deformation of PP-ECC beams under short-term load in practical engineering.
作者
李福海
何肖云峰
吴昊南
姜怡林
王奕彬
胡丁涵
LI Fuhai;HE Xiaoyunfeng;WU Haonan;JIANG Yilin;WANG Yibin;HU Dinghan(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《西南交通大学学报》
EI
CSCD
北大核心
2021年第4期853-863,共11页
Journal of Southwest Jiaotong University
基金
四川省科研计划(2019YFG0001,2019YJ0219)
教育部产学合作协同育人项目(201801098032)。
关键词
PP-ECC梁
变形性能
加载制度
有效惯性矩法
PP-ECC beam
deformation performance
loading system
effective moment of inertia method
