钢纤维混凝土三、四桩承台空间拉压杆模型的研究

Research on the Spacial Strut-and-tie Model for the Steel Fiber Reinforced Concrete Three-pile and Four-pile Caps

根据24个试件试验和非线性有限元分析结果,探讨了钢纤维混凝土三、四桩厚承台的破坏模式和受力机理。结果表明:钢纤维混凝土三、四桩厚承台的传力模型符合拉压杆模型(空间桁架模型),并由此提出了基于拉压杆模型破坏的承载力计算公式。

Through the results of the experiments and nonlinear finite element analysis for 24 specimens,the failure pattern and loading-transfer mechanism of the reinforced concrete(RC) and steel fiber reinforced concrete(SFRC) three-pile and four-pile caps have been discussed.The results point out that loading-transfer mechanism of RC and SFRC three-pile and four-pile caps accords with strut-and-tie model(STM),and the calculating formula for the carrying force has been make out based in failure of the STM.