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有損傷預(yù)應(yīng)力混凝土T梁靜載試驗(yàn)和有效預(yù)應(yīng)力檢測(cè)方法

發(fā)布時(shí)間:2018-01-14 12:19

  本文關(guān)鍵詞:有損傷預(yù)應(yīng)力混凝土T梁靜載試驗(yàn)和有效預(yù)應(yīng)力檢測(cè)方法 出處:《石家莊鐵道大學(xué)》2014年碩士論文 論文類型:學(xué)位論文


  更多相關(guān)文章: 預(yù)應(yīng)力混凝土T梁 有效預(yù)應(yīng)力 消壓荷載 應(yīng)力釋放 靜載試驗(yàn) 開(kāi)槽法


【摘要】:預(yù)應(yīng)力混凝土橋梁構(gòu)件中的有效預(yù)應(yīng)力是影響橋梁營(yíng)運(yùn)安全和使用壽命的關(guān)鍵因素,一旦預(yù)應(yīng)力出現(xiàn)較大損失,就有可能導(dǎo)致突發(fā)的脆性斷裂事故,造成災(zāi)難性的后果。近年來(lái),關(guān)于橋梁損傷判定和維修加固技術(shù)的研究越來(lái)越受到工程界的重視,但由于預(yù)應(yīng)力施加后就成為結(jié)構(gòu)內(nèi)力,很難直接測(cè)得,因此,對(duì)結(jié)構(gòu)構(gòu)件中有效預(yù)應(yīng)力的判定仍存在較大困難,,而準(zhǔn)確識(shí)別有效預(yù)應(yīng)力這一工作又對(duì)營(yíng)運(yùn)部門維修加固策略的選擇具有重要的工程實(shí)際意義。 2012年京通線某橋換梁,更換下來(lái)2片跨度23.8m預(yù)應(yīng)力混凝土梁,為進(jìn)行“既有線預(yù)應(yīng)力混凝土T梁工作性能及剩余預(yù)應(yīng)力識(shí)別方法研究”這一課題的研究工作提供了很好的機(jī)會(huì)。文中以其中一片梁為研究對(duì)象,分別進(jìn)行了靜載試驗(yàn)、消壓荷載測(cè)試以及混凝土應(yīng)力釋放法等試驗(yàn),對(duì)梁的有效預(yù)應(yīng)力進(jìn)行識(shí)別計(jì)算,論文主要進(jìn)行了以下研究工作: (1)歸納總結(jié)國(guó)內(nèi)外預(yù)應(yīng)力混凝土構(gòu)件中有效預(yù)應(yīng)力檢測(cè)方法,著重分析闡述了混凝土應(yīng)力釋放法的理論依據(jù)及其應(yīng)用發(fā)展; (2)使用ANSYS軟件建立了試驗(yàn)梁的混凝土應(yīng)力釋放法有限元計(jì)算模型,并得出槽間距為10cm、槽長(zhǎng)為30cm、槽深為3cm就能實(shí)現(xiàn)混凝土應(yīng)力釋放的結(jié)論; (3)進(jìn)行現(xiàn)場(chǎng)足尺寸梁試驗(yàn),通過(guò)消壓荷載測(cè)試結(jié)果得到構(gòu)件中預(yù)應(yīng)力損失量為26.48%,通過(guò)混凝土應(yīng)力釋放法試驗(yàn)得到構(gòu)件中預(yù)應(yīng)力損失為18.24%,按現(xiàn)行規(guī)范通過(guò)理論計(jì)算得到構(gòu)件中預(yù)應(yīng)力損失為28.86%。 本論文研究成果可為運(yùn)營(yíng)部門對(duì)同批次梁的工作性能評(píng)估工作提供依據(jù),為維修加固策略的選擇提供參照。
[Abstract]:The effective prestress of prestressed concrete bridge components is a key factor affecting the operation of the bridge safety and durability of prestressed, once appear larger losses, it may lead to brittle fracture accident, resulting in disastrous consequences. In recent years, on the bridge damage determination and maintenance of reinforcement technology has attracted more and more attention in Engineering field. But because of the internal force of the structure becomes the prestress, it is difficult to directly measure, therefore, to determine the effective prestress in structural members still exist great difficulties, and accurately identify the effective prestress of the job but also has important practical significance in strengthening the strategy choice of operating maintenance department.
2012 Beijing line of a bridge for beam, replaced 2 span prestressed concrete 23.8m beam, provide a good opportunity for the research work of this topic of "research" of existing prestressed concrete T beam performance and residual prestress identification method. In the paper, in which a beam as the research object, respectively under static load test, load test and elimination of concrete stress releasing method tests, to identify the effective prestress beam calculation, this paper mainly conducted the following research work:
(1) summarize the detection methods of effective prestressing force in prestressed concrete components at home and abroad, especially analyze and explain the theoretical basis and application development of concrete stress relief method.
(2) using ANSYS software to establish the finite element calculation model of concrete stress releasing method for test beams, and get the conclusion that the stress of the concrete is released when the slot spacing is 10cm, the trough length is 30cm, and the groove depth is 3cm.
(3) test site full size beam, by reducing load test result of prestress loss component content is 26.48%, the concrete stress releasing method test of prestress loss component was 18.24%, according to the current codes obtained by theoretical calculation of prestressed loss component for 28.86%.
The research results in this paper provide the basis for the operation performance evaluation of the same batch beam, and provide reference for the selection of the maintenance and reinforcement strategy.

【學(xué)位授予單位】:石家莊鐵道大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:U446

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 趙沖久;馬津渤;王立軍;;在役預(yù)應(yīng)力混凝土結(jié)構(gòu)損傷檢測(cè)與評(píng)定技術(shù)綜述[J];港工技術(shù);2007年03期

2 楊新華;開(kāi)槽法測(cè)試結(jié)構(gòu)工作應(yīng)力的有限元分析[J];建筑結(jié)構(gòu);1998年04期

3 劉齡嘉,賀拴海,趙小星;在役混凝土簡(jiǎn)支梁有效預(yù)應(yīng)力計(jì)算[J];交通運(yùn)輸工程學(xué)報(bào);2005年03期

4 龔維明,章叢俊,劉郁馨;預(yù)應(yīng)力長(zhǎng)期損失的灰色預(yù)測(cè)[J];南京建筑工程學(xué)院學(xué)報(bào)(自然科學(xué)版);1996年01期

5 薛松濤,錢宇音,陳昒,王遠(yuǎn)功;采用二階頻率靈敏度的損傷識(shí)別和試驗(yàn)[J];同濟(jì)大學(xué)學(xué)報(bào)(自然科學(xué)版);2003年03期

6 楊勇,王燦,朱新實(shí);既有橋梁結(jié)構(gòu)混凝土現(xiàn)存應(yīng)力測(cè)量與分析[J];同濟(jì)大學(xué)學(xué)報(bào)(自然科學(xué)版);1999年02期

7 范立礎(chǔ),袁萬(wàn)城,張啟偉;懸索橋結(jié)構(gòu)基于敏感性分析的動(dòng)力有限元模型修正[J];土木工程學(xué)報(bào);2000年01期

8 林家浩;;結(jié)構(gòu)動(dòng)力優(yōu)化中的靈敏度分析[J];振動(dòng)與沖擊;1985年01期

9 易偉建,劉霞;混凝土板的裂縫診斷[J];振動(dòng)工程學(xué)報(bào);2002年02期

10 王柏生;沈旭凱;林湘祁;;開(kāi)槽法測(cè)試混凝土工作應(yīng)力的試驗(yàn)研究[J];浙江大學(xué)學(xué)報(bào)(工學(xué)版);2010年09期

相關(guān)博士學(xué)位論文 前1條

1 郭琦;復(fù)雜預(yù)應(yīng)力體系梁式結(jié)構(gòu)有效預(yù)應(yīng)力預(yù)測(cè)理論與方法研究[D];長(zhǎng)安大學(xué);2008年



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