發(fā)布時(shí)間：2018-08-22 13:25

【摘要】：預(yù)應(yīng)力混凝土管樁（Prestressed High Strength concrete Pile，PHC管樁）具有單樁承載力高、質(zhì)量可控制、價(jià)格便宜施工速度快等優(yōu)點(diǎn)，在工程建設(shè)中得到廣泛的應(yīng)用。由于PHC管樁在地震作用下的水平承載力較差，，限制了其在地震區(qū)的使用范圍。因此，為擴(kuò)大PHC管樁在工程中的使用范圍，深入的研究PHC管樁的抗震性能具有重要的意義。本文通過試驗(yàn)、有限元數(shù)值計(jì)算對(duì)往復(fù)荷載作用下PHC管樁以及PHC管樁與承臺(tái)連接節(jié)點(diǎn)進(jìn)行了研究，研究成果可為PHC管樁在我國(guó)地震區(qū)的推廣應(yīng)用提供科學(xué)依據(jù)。 對(duì)PHC管樁進(jìn)行了低周往復(fù)荷載試驗(yàn)和單調(diào)加載試驗(yàn)。試驗(yàn)結(jié)果表明：預(yù)應(yīng)力鋼筋被拉斷導(dǎo)致PHC管樁發(fā)生脆性的受彎破壞；PHC管樁耗能性能較差，AB型樁的延性系數(shù)大于A型樁，耗能性能優(yōu)于A型樁。 對(duì)PHC管樁非線性受力過程的有限元分析表明：PHC管抗彎承載力隨著有效預(yù)壓應(yīng)力的增加而增加，而配箍率對(duì)其影響較小。 PHC管樁在往復(fù)荷載作用下受力性能的有限元分析得出，在7度設(shè)防地區(qū)應(yīng)將其使用時(shí)的最大曲率控制在0.01/m以內(nèi)，軸壓比宜控制在0.35以內(nèi)。 通過PHC管樁與承臺(tái)連接節(jié)點(diǎn)樁端低周往復(fù)荷載試驗(yàn)表明：節(jié)點(diǎn)樁端發(fā)生受彎破壞，破壞形式主要有：1）樁端預(yù)應(yīng)力筋被拉斷，導(dǎo)致樁端破壞嚴(yán)重，構(gòu)件發(fā)生脆性破壞；2）錨固鋼筋發(fā)生屈服，樁與承臺(tái)交接處出現(xiàn)塑性鉸，樁端與承臺(tái)破壞嚴(yán)重，構(gòu)件發(fā)生延性破壞。 通過PHC管樁與承臺(tái)連接未截樁和截樁兩種典型連接方式的有限元參數(shù)分析結(jié)果表明，軸力對(duì)兩種節(jié)點(diǎn)樁端承載力和延性影響較大；樁端嵌入承臺(tái)的長(zhǎng)度、錨固鋼筋的直徑以及數(shù)量對(duì)未截樁節(jié)點(diǎn)樁端的承載力和延性影響不大，但是對(duì)截樁節(jié)點(diǎn)樁端卻有著顯著的影響。 對(duì)改進(jìn)的管樁與承臺(tái)連接節(jié)點(diǎn)樁端進(jìn)行了低周往復(fù)荷載試驗(yàn)和有限元分析，結(jié)果表明：由于節(jié)點(diǎn)區(qū)域的承臺(tái)混凝土被壓碎，節(jié)點(diǎn)形成鉸，失去承載力，但樁端并未發(fā)生破壞。因此，在進(jìn)行節(jié)點(diǎn)設(shè)計(jì)時(shí)，應(yīng)該在節(jié)點(diǎn)有一定轉(zhuǎn)動(dòng)能力的基礎(chǔ)上，保證承臺(tái)不會(huì)由于樁端轉(zhuǎn)動(dòng)時(shí)產(chǎn)生的擠壓力或撬力作用過早的發(fā)生破壞，使得樁端承載力能得以充分發(fā)揮。
[Abstract]:Prestressed concrete pipe pile (Prestressed High Strength concrete PilePHC-PHC-pipe pile) has been widely used in engineering construction because of its high bearing capacity, controllable quality and fast construction speed. Because of the poor horizontal bearing capacity of PHC pipe pile under earthquake action, its application scope in earthquake area is limited. Therefore, in order to expand the application range of PHC pipe pile, it is of great significance to study the seismic behavior of PHC pipe pile. In this paper, the PHC pipe pile under reciprocating load and the connection joint between PHC pipe pile and cap are studied by means of experiment and finite element numerical calculation. The research results can provide scientific basis for the popularization and application of PHC pipe pile in earthquake area of our country. The low cycle reciprocating load test and monotone loading test were carried out for PHC pipe pile. The test results show that the ductility coefficient of PHC pile is higher than that of A-type pile, and the energy dissipation performance of AB pile is better than that of A-type pile. The finite element analysis of nonlinear stress process of PHC pipe pile shows that the flexural capacity of PHC pipe increases with the increase of effective preloading stress. The finite element analysis of the mechanical behavior of PHC pipe pile under reciprocating load shows that the maximum curvature should be controlled within 0.01 / m and the axial compression ratio should be controlled within 0. 35 in the 7 degree fortification area. Through the low cycle reciprocating load test of PHC pipe pile and cap connection joint, it is shown that the bending failure occurs at the end of the joint pile, the main failure form is: 1) the prestressed tendons at the end of the pile are broken, which leads to the serious damage of the pile end and the brittle failure of the members. 2) yielding of Anchorage steel bar, plastic hinge at the interface between pile and cap, serious damage between pile end and cap, and ductility failure of component. The results of finite element parameter analysis of two typical connection modes of PHC pipe pile and pile cap show that the axial force has great influence on the bearing capacity and ductility of the pile end of the two joints, the length of the pile end embedded in the pile cap, the length of the pile end embedded in the pile cap, and the bearing capacity and ductility of the pile end are greatly affected by the axial force. The diameter and quantity of Anchorage bar have little effect on the bearing capacity and ductility of the untruncated pile joint, but have a significant effect on the pile end of the truncated pile joint. The low cycle reciprocating load test and finite element analysis on the pile end of the improved tubular pile and cap connection joint are carried out. The results show that because of the crushed concrete of the cap in the joint area, the joint forms hinges and loses the bearing capacity, but the pile end is not destroyed. Therefore, in the design of the joint, it is necessary to ensure that the pile cap will not be destroyed prematurely because of the extruding force or the prying force when the pile tip rotates, on the basis of the certain rotation ability of the joint, so that the bearing capacity of the pile end can be brought into full play.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU473.1;TU352.11

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李建宏;徐敏;陳麗華;柳炳康;;預(yù)應(yīng)力混凝土管樁受彎承載力非線性有限元分析[J];安徽建筑工業(yè)學(xué)院學(xué)報(bào)(自然科學(xué)版);2007年04期

2 凌應(yīng)軒;李建宏;黃晨;;預(yù)應(yīng)力混凝土管樁抗剪承載力計(jì)算方法[J];工程與建設(shè);2007年01期

3 盛海;張星宇;宋滿榮;;預(yù)應(yīng)力混凝土管樁受剪承載力非線性有限元分析[J];工程與建設(shè);2007年05期

4 馬英驊,俞能蘭;直徑1400mmC2型管樁的抗彎性能研究[J];中國(guó)港灣建設(shè);1999年04期

5 柳炳康;李建宏;張星宇;盛海;;預(yù)應(yīng)力填芯管樁抗彎性能與延性特征的試驗(yàn)[J];工業(yè)建筑;2007年03期

6 邢克勇;趙春曉;趙懷宇;王中榮;;預(yù)應(yīng)力管樁與承臺(tái)連接性能試驗(yàn)研究[J];國(guó)防交通工程與技術(shù);2012年05期

7 賀武斌;崔向東;郭昭勝;白曉紅;;樁頭加強(qiáng)型預(yù)應(yīng)力管樁與承臺(tái)連接處受彎性能試驗(yàn)研究[J];工業(yè)建筑;2014年01期

8 宋寅;柳炳康;李建宏;盛海;張星宇;;填芯與非填芯預(yù)應(yīng)力混凝土管樁抗彎性能的比較[J];合肥工業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版);2007年05期

9 劉永超;鄭剛;康谷貽;王清龍;;預(yù)應(yīng)力混凝土管樁斜截面抗剪承載力試驗(yàn)研究[J];建筑結(jié)構(gòu);2011年05期

10 劉俊偉;張忠苗;于秀霞;齊X;畢經(jīng)鵬;;預(yù)應(yīng)力混凝土管樁抗彎及抗剪性能試驗(yàn)研究[J];建筑技術(shù);2010年12期

相關(guān)博士學(xué)位論文 前2條

1 劉永超;預(yù)應(yīng)力混凝土管樁結(jié)構(gòu)性能研究及新樁型開發(fā)[D];天津大學(xué);2009年

2 陳滔;基于有限單元柔度法的鋼筋混凝土框架三維非彈性地震反應(yīng)分析[D];重慶大學(xué);2003年

本文編號(hào)：2197232