为满足某些特殊工程对管桩高抗弯承载力的需求,对C100双层配筋管桩进行足尺模型抗弯性能试验和有限元建模分析。结果表明:制备直径1 000 mm壁厚130 mm的C100双层配筋PRC管桩的开裂弯矩和极限弯矩分别达到1 648.66 kN·m和4 025.10 kN·m,相比现有行标的管桩成品中抗弯性能较高的PRC I-1000 C型桩,抗弯性能得到了较好地改善和提高;管桩的破坏形式为受拉区钢筋先屈服,混凝土出现裂缝,随着荷载的增加受拉区混凝土裂缝快速扩展达到1.5 mm发生延性破坏;开裂弯矩和极限弯矩理论计算值略小于试验结果,有限元计算结果与试验结果吻合良好,验证了规范公式和有限元分析对大直径双层配筋C100PRC管桩的适用性。
Full-scale model bending performance tests and finite element modeling analysis were conducted on C100 double-layer reinforced pipe piles to meet the high bending bearing capacity requirements of certain special engineering projects. The results show that: The cracking moment and ultimate bending moment of the prepared C100 double-layer reinforced PRC pipe pile reach 1648.66kN·m and 4 025.10 kN·m, respectively. Compared with the PRC I-1000 C-type pile with higher bending performance among the existing standard pipe pile products, the bending performance of C100 double-layer reinforced PRC pipe pile improve significantly. The failure form of pipe piles is manifested as the steel bars in the tension zone yielding first, and the concrete in the tension zone exits the work after cracks appear. Then, the concrete cracks in the tension zone rapidly develop and expand to a ductile failure of 1.5 mm. The theoretical calculation values of cracking bending moment and ultimate bending moment are slightly smaller than the test results, and the finite element computing results are in good agreement with the test results. The applicability of normative formulas and finite element analysis to large diameter double layer reinforced C100PRC pipe piles is verified.
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