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EXPERIMENTAL STUDIES OF FLEXURAL BEHAVIOR OF NEW TYPE PRESTRESSED CONCRETE PIPE PILE WITH COMPOUND UNPRESTRESSED REINFORCEMENT
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摘要: 提出新型混合配筋预应力混凝土管桩的概念,即在预应力混凝土管桩中加入一定数量的非预应力钢筋,形成水平承载混凝土复合截面,以提高预应力管桩的抗弯承载力和延性。通过对5种配有非预应力钢筋的新型混合配筋预应力混凝土管桩(每种形式制作2根)与2根普通预应力混凝土管桩的对比试验,结果表明配置非预应力钢筋后的新型管桩具有好的抗弯性能。最后,基于GB 500102010《混凝土结构设计规范》和试验结果,提出新型管桩的抗裂弯矩计算公式;推导了新型管桩抗弯承载力设计计算理论公式;计算结果与试验结果符合良好。
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关键词:
- 新型预应力混凝土管桩 /
- 混合配筋 /
- 抗弯性能 /
- 试验和理论研究
Abstract: It was presented the concept of a new type unprestressed reinforcement compounded prestressed concretepipe pile ( URC-PCPP )．In the URC-PCPP, in order to increase the bending capacity and ductility, someunprestressed HRB400 rebars were added, forming horizontal loading concrete compound sections．Five kinds of fullscale URC-PCPPs and two kinds of full scale common prestressed concrete pipe piles that used for comparison weredesigned and fabricated．The standard bending tests on the specimens were carried out．The test results showed thatthe URC-PCPPs possed good flexure properties．Based on the data from the tests and GB 5001 0 201 0 ConcreteStructure Design Code, the formulas for the crack moment was suggested and the design equations of flexural capacityfor the URC-PCPPs as well as the formulas of ultimate moment for the factory checkout of the pipe piles were derived．The numerical results agreed well with the test data, satisfying to the design requirement of the pipe pile． -
宋寅,柳炳康,李建宏,等.填芯与非填芯预应力混凝土管桩抗弯性能的比较[J].合肥工业大学学报:自然科学版,2007,30(5):607-610. [2] 蒋元海.先张法预应力混凝土管桩结构设计[J].特种结构,1999,16(1):57-60 [3] 吴为民.预应力管桩水平裂缝的检测与研究[J].岩土工程界,2001,4(8):50-52 [4] 李连营,詹斌,戴斌.预应力管桩水平承载力的研究[J].岩土工程界,2006,9(12):69-70. [5] GB134762009先张法预应力混凝土管桩[S]. [6] GB500102010混凝土结构设计规范[S]. -
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