GFRP筋的高温蠕变性能试验分析

基金项目:

国家自然科学基金资助项目(50321803);中国博士后科研基金资助项目(20040350492);上海市博士后科研资助计划(04R214105)资助项目

TEST STUDY ON THERMAL CREEP STRAIN OF GFRP BARS

1.
1. School of Engineering and Architecture,Beijing Jiaotong University,Beijing 100044;
2.
2. State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092

摘要: 通过对21组,共72根不同应力状态、不同温度下GFRP筋的蠕变性能进行的试验和分析,表明:随时间的延长GFRP筋的应变逐渐增大,而同一应力水平的GFRP筋试件随温度的升高,应变有增大的趋势。根据试验结果,可以确定预应力GFRP筋增强混凝土构件在火灾高温条件下GFRP筋的预应力损失值。
- GFRP筋 /
- 高温蠕变 /
- 火灾 /
- 高温
Abstract: To study the thermal creep strain of FRP bars in fire, experiment are carried out on 72 (21groups) prestressing GFRP bars exposed to high temperature under axial load. The parameters considered are temperature variation and stress level. The thermal creep strain rate and the tensile strength of GFRP bars are investigated through test. The test results are obtained during high temperature exposure. The thermal creep strain of GFRP bars expands with the r ise of temperature and stress level. The results can be applied to calculate the prestress for ce loss of prestressing GFRP reinforced concrete structures in fire.
- GFRP bar /
- thermal creep /
- fire /
- high temperature