【摘要】：本文將液壓法施加預應力與鋼管混凝土技術聯(lián)系在一起,形成預應力鋼管混凝土。預應力鋼管混凝土在具有普通鋼管混凝土特點的基礎上,利用預先施加的應力增加受荷前鋼管對核心混凝土的約束作用,這可以改善普通鋼管混凝土中外包鋼管對核心混凝土約束不足的問題,也可以改善自應力鋼管混凝土無法主動施加預應力的問題。本文依托于江蘇省高校自然科學研究項目《液壓預應力鋼管混凝土柱軸壓性能試驗研究與數(shù)值模擬》(15KJB560001),主要研究內容如下:(1)開展了3根普通鋼管混凝土柱的變形試驗,試驗結果發(fā)現(xiàn):在混凝土灌注后的前4天,鋼管混凝土柱產生膨脹變形,之后由于水化收縮等使鋼管混凝土柱產生收縮現(xiàn)象,最終的橫向應變約為-108με,縱向應變約為-46με;(2)為了補償核心混凝土的收縮,完成了6個不同膨脹劑摻量的鋼管混凝土柱的變形及力學性能試驗。試驗結果表明:補償收縮的最優(yōu)膨脹劑摻量為12%。膨脹劑摻量為12%時試件在28天內均產生膨脹變形;與其他試件相比,膨脹劑摻量為12%時試件彈性階段的剛度及極限承載力均為最大值;(3)進行了4根液壓預應力鋼管混凝土的預應力長期損失試驗,試驗結果表明:膨脹劑摻量為12%的預應力鋼管混凝土在28天的預應力損失控制在20%以內,而未摻膨脹劑試件的預應力損失約為45%,表明摻膨脹劑可有效降低預應力損失,建議膨脹劑摻量為12%;(4)進一步開展了6根液壓預應力鋼管混凝土柱的軸壓試驗,主要參數(shù)為膨脹劑摻量(0、12%)和預應力值(0MPa、2.5MPa、5MPa、7.5MPa)。試驗結果表明:施加預應力后,鋼管混凝土柱彈性階段的剛度及彈性階段的最大軸力提升明顯,且預應力值越大提升效果越明顯;與非預應力鋼管混凝土柱相比,預應力試件彈性階段的最大軸力最高可達極限承載力的95.6%,彈性階段的剛度最高可增大612%;與未摻膨脹劑的預應力試件相比,膨脹劑摻量為12%的預應力試件彈性階段的最大軸力可提高16%左右,彈性階段的剛度可增大94%左右;預應力試件的極限承載力變化不大;(5)使用ABAQUS軟件建立了液壓預應力鋼管混凝土柱的軸壓模型,模擬了液壓法施加預應力及試件軸壓的全過程,軟件分析結果與試驗結果吻合良好。
[Abstract]:In this paper, the prestressing force of hydraulic method and the technology of concrete filled steel tube (CFST) are combined to form the prestressed concrete filled steel tube. Based on the characteristics of concrete filled steel tube (CFST), the prestressed concrete filled steel tube (CFST) increases the restraint effect of CFST on the core concrete before loading by using the stress applied in advance. This can improve the problem that the concrete filled steel tube has insufficient restraint to the core concrete, and it can also improve the problem that the self-stressed concrete-filled steel tube can not exert the prestressing force on its own initiative. This paper is based on the "Experimental study and numerical Simulation of Axial compressive behavior of hydraulic Prestressed concrete filled Steel Tubular columns" (15KJB560001), which is based on the Natural Science Research Project of Jiangsu University. The main research contents are as follows: (1) the deformation tests of three concrete filled steel tube columns were carried out. The results showed that the expansion deformation of concrete filled steel tube columns occurred in the first 4 days after concrete pouring. The ultimate transverse strain is-108 渭 蔚 and the longitudinal strain is-46 渭 蔚 due to the shrinkage of concrete-filled steel tube columns caused by hydration and shrinkage. (2) in order to compensate the shrinkage of core concrete, the deformation and mechanical properties of six concrete filled steel tubular columns with different content of expansive agent were tested. The experimental results show that the optimal content of expansion agent for compensating shrinkage is 12%. When the content of expansive agent is 12%, the expansion deformation occurs in 28 days, compared with other specimens, the stiffness and ultimate bearing capacity of the specimen in elastic stage are maximum when the content of expansive agent is 12%. (3) the long-term prestress loss test of 4 hydraulic prestressed concrete filled steel tubes is carried out. The results show that the prestressing loss of concrete filled steel tube with 12% dilatant content is less than 20% in 28 days, and the prestress loss of concrete filled steel tube is less than 20% in 28 days. The loss of prestressing force is about 45%, which indicates that the loss of prestress can be effectively reduced by adding expansive agent, and it is suggested that the content of dilatant is 12%. (4) the axial compression tests of 6 hydraulic prestressed concrete filled steel tube columns were carried out. The main parameters were the content of expansive agent (0, 12%) and the pre-stress value (0 MPA, 2.5 MPA, 5 MPA, 7.5 MPA). The experimental results show that the stiffness and the maximum axial force of the concrete-filled steel tube columns in the elastic stage are obviously increased after prestressing, and the bigger the prestress value is, the more obvious the effect is. Compared with non-prestressed concrete-filled steel tube columns, the maximum axial force of prestressed specimens in elastic stage is up to 95.6% of the ultimate bearing capacity, and the maximum stiffness in elastic stage can be increased by 612%. Compared with the pre-stressed specimen without expansive agent, the maximum axial force of the prestressed specimen with 12% expansive agent can be increased by 16% and the stiffness of the elastic stage can be increased by about 94%, and the ultimate bearing capacity of the prestressed specimen does not change much, and the maximum axial force of the prestressed specimen with 12% content can be increased by 16% and 94% respectively. (5) the axial compression model of hydraulic prestressed concrete filled steel tube column is established by using ABAQUS software, and the whole process of applying prestressing force and axial compression of specimen by hydraulic pressure method is simulated. The software analysis results are in good agreement with the experimental results.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU398.9

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