预应力高强混凝土矩形支护桩的受弯性能  

Flexural performance of rectangular prestressed high strength concrete supporting pile

作　　者：周文苑[1] 黄广龙[1] 凌德祥 韩晓健[1] 

机构地区：[1]南京工业大学交通学院,江苏南京210009 [2]盐城市双强管桩有限公司,江苏盐城224000

出　　处：《南京工业大学学报（自然科学版）》2011年第5期84-89,共6页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：江苏省自然科学基金资助项目(BK2009732)

摘　　要：针对预应力混凝土预制桩在基坑支护中的应用,开发新型的预应力高强混凝土矩形支护桩。通过9根矩形支护桩的受弯性能试验,研究了矩形支护桩的受弯破坏特征、裂缝开展情况和受弯承载力。结果表明:在外荷载作用下,矩形支护桩变形体现了很好的弹性和延性;矩形支护桩截面的应变分布符合平截面假定;矩形支护桩的抗裂弯矩实测值与计算值之比平均为1.33;实测极限弯矩与理论计算值基本接近。基于试验结果,提出对矩形支护桩抗裂弯矩和极限弯矩计算方法的修正建议,计算结果与试验结果吻合较好。对比发现,在相近的成本条件下,矩形支护桩比空心方桩受弯承载力增加10%～20%。Aiming at the application of prestressed concrete prefabricated piles in foundation excavation, a new type of prestressed concrete rectangular pile was presented. Failure characteristics, crack development situation and flexural strength were researched by the flexural performance experiments of 9 rectangular supporting piles. Results showed that the deformation of rectangular supporting pile reflected good elasticity and ductility under the imposed load. The strain distribution of rectangular supporting pile was accorded with the plane hypothesis. The measured crack moment of rectangular supporting pile was 1.33 times higher than that of theoretical calculation. The measured ultimate bending moment was close to theoretical results. Based on experimental results, the correction advice about crack moment and ultimate bending moment of rectangular supporting piles was put forward. The calculated results agreed well with experimental results. It could be found that the flexural strength of rectangular supporting pile was 10% -20% higher than that of hollow piles under the similar conditions.

关 键 词：矩形支护桩 受弯性能 抗裂弯矩 

分 类 号：TU366[建筑科学—结构工程]