發(fā)布時(shí)間：2018-09-04 18:47

【摘要】：預(yù)應(yīng)力混凝土管樁(PHC管樁)由于單樁承載能力高、施工速度快等優(yōu)點(diǎn),在工程建設(shè)中得到廣泛的應(yīng)用。但是,國內(nèi)外的震害調(diào)查結(jié)果表明管樁的抗水平地震能力不足,限制了管樁的使用范圍。因此,有必要采取合適的改進(jìn)措施來提高PHC管樁的抗震性能。將PHC管樁中的預(yù)應(yīng)力鋼筋替換為相同數(shù)量的高延性鋼棒,可以得到高延性鋼棒預(yù)應(yīng)力混凝土管樁(High ductility of steel bar for prestressed high strength concrete pile,HDPHC管樁)。本文利用ANSYS有限元軟件建立HDPHC管樁模型,對(duì)管樁在往復(fù)荷載作用下的抗震性能進(jìn)行有限元分析。首先,使用ANSYS有限元軟件建立PHC管樁模型,進(jìn)行擬靜力數(shù)值模擬分析,將分析結(jié)果與PHC管樁的試驗(yàn)結(jié)果進(jìn)行對(duì)比,驗(yàn)證模型的正確性;其次,在上述正確模型的基礎(chǔ)上,用高延性預(yù)應(yīng)力鋼棒替換普通預(yù)應(yīng)力鋼棒,建立HDPHC管樁模型,進(jìn)行低周往復(fù)荷載的數(shù)值模擬,分析HDPHC管樁的抗震性能;最后,分析體積配箍率、預(yù)應(yīng)力筋配筋率、混凝土的有效預(yù)壓應(yīng)力和混凝土強(qiáng)度等級(jí)等影響管樁抗震性能的因素,研究其對(duì)HDPHC管樁抗震性能的影響。通過分析可以得到以下結(jié)論,HDPHC管樁的滯回曲線比PHC管樁滯回曲線更加飽滿,其抗震性能更好;與PHC管樁的骨架曲線相比,HDPHC管樁的骨架曲線較光滑且有明顯的下降段,說明HDPHC管樁的延性得到很好的改善;HDPHC管樁每一循環(huán)所得的滯回環(huán)包圍的面積更大,說明其耗能能力更好,具有很好的降低地震反應(yīng)、減輕地震破壞的能力;改變體積配箍率可以提高HDPHC管樁的抗震性能,高延性鋼棒直徑的增大對(duì)管樁抗震性能的提高較明顯,混凝土有效預(yù)壓力的增大不能提高管樁的抗震性能。
[Abstract]:Prestressed concrete pipe pile (PHC pipe pile) has been widely used in engineering construction because of its high bearing capacity and fast construction speed. However, the results of earthquake damage investigation at home and abroad show that the horizontal seismic resistance of pipe pile is insufficient, which limits the application range of pipe pile. Therefore, it is necessary to take appropriate improvement measures to improve the seismic performance of PHC pipe pile. By replacing the prestressed steel bar in the PHC pipe pile with the same number of high ductile steel bars, the high ductile steel bar prestressed concrete pipe pile (High ductility of steel bar for prestressed high strength concrete pile,HDPHC pipe pile can be obtained. In this paper, the HDPHC pipe pile model is established by using ANSYS finite element software, and the seismic behavior of pipe pile under reciprocating load is analyzed by finite element method. Firstly, the PHC pipe pile model is established by using ANSYS finite element software, and the quasi-static numerical simulation analysis is carried out. The results are compared with the test results of PHC pipe pile to verify the correctness of the model; secondly, on the basis of the above correct model, The HDPHC pipe pile model is established by replacing the common prestressed steel bar with the high ductile prestressed steel bar, and the numerical simulation of low cycle reciprocating load is carried out to analyze the seismic behavior of the HDPHC pipe pile, and finally, the volume hoop ratio, the reinforcement ratio of the prestressing tendons, the seismic behavior of the HDPHC pipe pile are analyzed. The effective preloading stress of concrete and the grade of concrete strength affect the seismic behavior of pipe pile. The influence of effective preloading stress and strength grade of concrete on the seismic behavior of HDPHC pipe pile is studied. The following conclusions can be obtained: the hysteretic curve of HDPHC pipe pile is fuller than that of PHC pipe pile, and its seismic performance is better than that of PHC pipe pile, and the skeleton curve of HDPHC pipe pile is more smooth and has obvious descending section than that of PHC pipe pile. It shows that the ductility of HDPHC pipe pile is improved very well. The hysteresis loop surrounding area of each cycle of HDPHC pipe pile is larger, which indicates that its energy dissipation ability is better, and it has the ability to reduce earthquake response and reduce earthquake damage. The seismic behavior of HDPHC pipe pile can be improved by changing the ratio of volume hoop, the seismic performance of pipe pile is obviously improved by increasing the diameter of high ductile steel bar, and the seismic performance of pipe pile can not be improved by the increase of effective preloading of concrete.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU473.1

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