BFRP模壳不排水加固RC墩柱恢复力模型

张景杭1,2,3,夏樟华2,姜绍飞2,洪俊贤1,朱朴1

振动与冲击 ›› 2024, Vol. 43 ›› Issue (16) : 192-203.

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (16) : 192-203.
论文

BFRP模壳不排水加固RC墩柱恢复力模型

  • 张景杭1,2,3,夏樟华2,姜绍飞2,洪俊贤1,朱朴1
作者信息 +

A restoring force model of RC pier columns reinforced by a BFRP shell without drainage

  • ZHANG Jinghang1,2,3,XIA Zhanghua2,JIANG Shaofei2,HONG Junxian1,ZHU Pu1,FAN Qian2
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摘要

为研究BFRP(Basalt Fiber Reinforced Polymer)模壳不排水加固RC墩柱抗震恢复力模型,在拟静力试验基础上,采用OpenSees有限元软件对模壳加固墩柱进行数值分析,主要研究参数为填充层混凝土强度、模壳厚度、加固高度、轴压比。研究表明:填充层混凝土强度等级越高,墩柱抗震性能有所增强,但C40以上的填充层混凝土强度等级墩柱的抗震性能较为接近;模壳加固厚度较大墩柱的抗震性能优于厚度较小墩柱;模壳加固高度较高时,墩柱的抗震性能较好,当加固高度大于2~3倍原墩柱塑性铰高度时,抗震性能提升效果趋于稳定;轴压比越大,墩柱的刚度退化较快,不利延性发展。后通过数据回归分析,建立了BFRP模壳加固RC墩柱恢复力模型,对比可知,恢复力模型与试验曲线拟合较好,能有效反映加固墩柱的滞回性能,可为此类结构的抗震性能分析提供参考。

Abstract

To study the seismic restoring force model of BFRP (Basalt Fiber Reinforced Polymer) shell reinforced RC pier columns without drainage, numerical analysis was conducted on the shell reinforced RC pier columns using OpenSees finite element software on the basis of quasi-static tests. The main research parameters were the strength of filled layer concrete, shell thickness, reinforcement height, and axial compression ratio.Research had shown that: The higher the strength level of the filled layer concrete, the stronger the seismic performance of the pier column. However, the seismic performance of the filled layer concrete with a strength level above C40 was relatively similar to that of the pier column; The seismic performance of pier columns with larger thickness reinforced by formwork was better than that of pier columns with smaller thickness; When the reinforcement height of the formwork was high, the seismic performance of the pier column was good. When the reinforcement height was greater than 2-3 times the plastic hinge height of the original pier column, the seismic performance improvement effect tendsed to be stable; The larger the axial compression ratio, the faster the stiffness degradation of the pier column, which was unfavorable for the development of ductility. Then through data regression analysis, a restoring force model for BFRP shell reinforced RC pier columns was established. The comparison showed that the restoring force model fitted well with the experimental curve and could effectively reflect the hysteresis performance of the reinforced pier columns, providing reference for the seismic performance analysis of such structures.

关键词

BFRP模壳 / 不排水加固 / RC墩柱 / 有限元 / 参数分析 / 恢复力模型

Key words

BFRP shell / undrained reinforcement / RC pier column / finite element / parameter analysis / restoring force model

引用本文

导出引用
张景杭1,2,3,夏樟华2,姜绍飞2,洪俊贤1,朱朴1. BFRP模壳不排水加固RC墩柱恢复力模型[J]. 振动与冲击, 2024, 43(16): 192-203
ZHANG Jinghang1,2,3,XIA Zhanghua2,JIANG Shaofei2,HONG Junxian1,ZHU Pu1,FAN Qian2. A restoring force model of RC pier columns reinforced by a BFRP shell without drainage[J]. Journal of Vibration and Shock, 2024, 43(16): 192-203

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