摘要
将CFRP和粘结CFRP所用胶黏剂作为"整体材料",建立了不同温度下CFRP-混凝土界面的等效本构关系,并运用ANSYS有限元分析程序对分别采取厚型防火涂料、超薄型防火涂料和水泥砂浆作防火保护材料的CFRP加固混凝土梁在不同工况下的抗火性能进行了分析,研究防火保护材料厚度、混凝土保护层厚度、荷载比及加固量对CFRP加固混凝土梁抗火性能的影响。结果表明,CFRP加固混凝土梁抗火性能随着荷载比和加固量的增大而降低,随着防火保护材料厚度和混凝土保护层厚度的增加而增强;相对而言,防火保护层厚度、荷载比和跨高比对CFRP加固混凝土梁耐火性能的影响较大,而加固量的影响相对较小。
An equivalent constitutive model considering CFRP and adhesive material as an integral layer was introduced to make it possible to take account of the effect of high temperature. The finite element program ANSYS was adopted to simulate the CFRP-strengthened concrete beams with various fireproofing materials including thick fire coating, ultra-thin fire coating and normal cement mortar under different conditions. The parameters that were studied include： fireproofing material depth, protective coating depth, and loading ratio and strengthening ratio of the beam. The results showed that the fire-resisting behavior of CFRP-strengthened concrete beam with fire protection decreases as the loading ratio and strengthening ratio increase; it, however, increases as the depth of fireproof coating and protective coating increase. Generally speaking, protective coating depth, loading ratio and span-depth ratio of CFRP-strengthened concrete beam have greater impact on the fire-resisting behavior compared with that of the strengthening ratio.
出处
《结构工程师》
北大核心
2015年第2期117-123,共7页
Structural Engineers
关键词
CFRP加固混凝土梁
防火保护
抗火性能
CFRP-混凝土界面
等效本构关系
CFRP-strengthened concrete beam, fire protection, fire-resisting behavior, interface between CFRP and concrete, equivalent constitutive model
