摘要
文中分析了不同冷却形式对火灾后混凝土和钢筋的力学性能的影响;在热传导理论基础上,对高温下混凝土梁截面温度场分布进行了分析,并采用无限大物体一维热传导方程的解作适当修正后的公式作为梁截面温度场计算公式,在结合分层法的基础上,推导了火灾后在不同冷却方式下无粘结预应力T形混凝土受弯构件残余承载力计算方法;为研究和分析无粘结预应力T形混凝土结构高温抗火性能及灾后加固修复安全性提供了坚实的理论依据。
This paper analyzes the effect of different cooling forms on the mechanical properties of concrete and steel bar after fire.Based on heat transfer theory,the concrete beam section temperature field distribution under the high temperature are analyzed and solution of onedimensional heat conduction equation with infinite object be appropriately revised formula as a beam section temperature field calculation formula,in combination with the layered method,on the basis of fire under different cooling ways was deduced unbonded prestressed concrete T residual bearing capacity calculation method of flexural member;It provides a solid theoretical basis for the study and analysis of the hightemperature fire resistance of unbonded prestressed T-shaped concrete structures and the safety of post-disaster reinforcement and repair.
作者
廖勇
王中强
Liao Yong;Wang Zhongqiang(School of Civil Engineering,Changsha University of Science and Technology,Changsha,Hunan 410000)
出处
《江西建材》
2021年第11期22-25,28,共5页
Jiangxi Building Materials
基金
湖南省教育厅重点项目(编号:18A218)。
关键词
高温
冷却方式
无粘结预应力
T形混凝土梁
温度场
剩余承载能力
High temperature
Cooling mode
Unbonded prestress
T-shaped concrete beam
Temperature field
Residual carrying capacity
