绿色高性能纤维增强水泥基复合材料梁柱节点抗火性能研究

Fire performance of Green High Performance Fiber Reinforced Cementitious Composites beam-column joint

绿色高性能纤维增强水泥基复合材料(Green High Performance Fiber Reinforced Cementitious Composites,简称GHPFRCC)主要是以工业废料粉煤灰代替水泥,加入聚乙烯醇纤维等材料制备而成,具有低碳高效、力学性能优异的特点。通过3组GHPFRCC梁柱节点构件试验,从轴压比和受火方式两方面研究了GHPFRCC梁柱节点的耐火性能,并通过有限元分析与试验结果进行了对照,论证了ABAQUS模型的有效性。结果表明:有限元模拟分析与试验结果吻合良好;轴压比的大小与试件耐火极限成反比关系,为保证试件耐火性能,应合理控制其轴压比;轴压比过大时,箍筋配置密集度影响构件火灾后的破坏程度;三面受火试件梁端挠度变形在相同温度荷载条件下大于四面受火试件。

Green High Performance Fiber Reinforced Cementitious Composites(GHPFRCC)is mainly produced by adding polyvinyl alcohol fiber to matrix and replacing cement with industrial waste fly ash,which has an excellent performance of mechanical property and reducing carbon emission.This paper studied the refractoriness of GHPFRCC beam-column joint from the aspects of axial compression ratio and fire mode through the test of three beam-column joints with GHPFRCC.Plus,this paper demonstrated the validity of the AQAQUS model through the comparison between finite element analysis and test results.The following conclusion were obtained:the finite element simulation analysis is consistent with experimental results;the axial compression ratio is inversely proportional to the specimen refractory limit and the axial compression ratio should be controlled reasonably to ensure the favorable performance of the fire resistance property;stirrup configuration intensity may affect the damage degree of GHPFRCC beam-column joint after elevated temperature as the axial compression ratio is beyond its reasonable range;the deformation of the beam end after three sides elevated temperature is larger than that of four sides under the condition of similar temperature and load.