【摘要】：活性粉末混凝土(RPC)是一種超高性能混凝土,具有超高強(qiáng)度、優(yōu)異的耐久性、良好的延性和耗能能力。活性粉末混凝土預(yù)制管混凝土組合柱(簡(jiǎn)稱(chēng)RPC管組合柱)是利用RPC的超高性能而提出的一種新型組合結(jié)構(gòu),由預(yù)制的RPC管和核心混凝土組成,能充分發(fā)揮RPC本身材料的超高抗壓性能和約束混凝土的組合效應(yīng),具有軸向承載力高、抗火性能優(yōu)異、耐久性好、材料成本低、施工方便及良好的生態(tài)效益等優(yōu)點(diǎn),是在超高性能混凝土與組合結(jié)構(gòu)的交叉領(lǐng)域進(jìn)行的創(chuàng)新性工作。本文進(jìn)行了5組RPC管組合柱的軸心抗壓試驗(yàn),主要研究的參數(shù)是RPC管的厚度和箍筋間距,通過(guò)試驗(yàn)得出了RPC管組合柱的力—變形關(guān)系曲線(xiàn),各種材料應(yīng)變發(fā)展情況以及破壞形態(tài)。并將組合柱的承載力與按已有的約束混凝土柱模型計(jì)算的結(jié)果進(jìn)行比較和分析,得到了RPC管組合柱的軸心受壓基本性能,為下一步的研究奠定了基礎(chǔ)。具體的研究?jī)?nèi)容如下:第一章:介紹了超高性能混凝土(UHPC)以及約束混凝土的研究概況,對(duì)活性粉末混凝土的推廣和應(yīng)用做了說(shuō)明�；赗PC的優(yōu)異性能和組合柱的基本結(jié)構(gòu)形式,提出了一種新型組合柱—RPC管組合柱,并對(duì)其結(jié)構(gòu)形式及特性進(jìn)行了重點(diǎn)闡述。第二章:提出了組合柱進(jìn)行軸心抗壓試驗(yàn)的方案,對(duì)試件的設(shè)計(jì)和制作進(jìn)行了詳細(xì)說(shuō)明,并進(jìn)行了RPC的材料配比試驗(yàn),最后加工了RPC預(yù)制管。第三章:對(duì)5組RPC管組合柱進(jìn)行軸心抗壓試驗(yàn),得出各組試件的力—變形關(guān)系曲線(xiàn)和各種材料的應(yīng)變,以及加載過(guò)程中的變形情況及破壞形態(tài),對(duì)不同預(yù)制管壁厚和箍筋間距的RPC管組合柱進(jìn)行受力分析。第四章:介紹幾種約束混凝土模型理論,并選取Mander模型理論對(duì)試件的承載力進(jìn)行近似計(jì)算,再和試驗(yàn)結(jié)果進(jìn)行對(duì)比分析�？疾齑死碚摴綄�(duì)這種新型組合柱的適用性,為進(jìn)一步研究RPC管組合柱的基本性能提供理論參考。
[Abstract]:Reactive powder concrete (RPC) is an ultra-high performance concrete with super-high strength, excellent durability, good ductility and energy dissipation capacity. Reactive powder concrete precast pipe concrete composite column (referred to as RPC pipe composite column) is a new type of composite structure, which is composed of precast RPC pipe and core concrete, which makes use of the ultra-high performance of RPC. It has the advantages of high axial bearing capacity, excellent fire resistance, good durability, low material cost, convenient construction and good ecological benefit, which can give full play to the super high compressive performance of RPC material and the combined effect of confined concrete. It is an innovative work in the intersection of ultra-high performance concrete and composite structure. In this paper, the axial compression test of five groups of RPC pipe composite columns has been carried out. The main research parameters are the thickness of RPC pipe and the spacing of stirrups. The force-deformation relationship curve of RPC pipe composite column has been obtained through the test. Strain development and failure patterns of various materials. The bearing capacity of composite columns is compared with the results calculated according to the existing confined concrete column model, and the basic performance of axial compression of RPC pipe composite columns is obtained, which lays a foundation for the further research. The concrete research contents are as follows: in the first chapter, the research situation of ultra-high performance concrete (UHPC) and confined concrete is introduced, and the popularization and application of reactive powder concrete (RPC) are explained. Based on the excellent performance of RPC and the basic structure form of composite column, a new type of composite column-RPC pipe composite column is put forward, and its structure form and characteristics are described in detail. In the second chapter, the scheme of axial compression test for composite columns is put forward, the design and fabrication of the specimens are explained in detail, and the material proportion test of RPC is carried out. Finally, the RPC prefabricated pipe is fabricated. In the third chapter, the axial compression test of five groups of RPC tube composite columns is carried out, and the force-deformation relation curves and the strain of various materials are obtained, as well as the deformation and failure patterns in the loading process. The stress analysis of RPC pipe composite columns with different wall thickness and stirrups spacing was carried out. In chapter 4, several kinds of confined concrete model theory are introduced, and the Mander model theory is selected to calculate the bearing capacity of the specimen approximately, and then the test results are compared and analyzed. The applicability of the theoretical formula to this new type of composite column is investigated, which provides a theoretical reference for the further study of the basic behavior of RPC pipe composite column.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU528

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本文編號(hào)：2463397