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基于裂縫特征參數(shù)的混凝土梁預(yù)應(yīng)力評(píng)價(jià)

發(fā)布時(shí)間:2018-08-22 07:18
【摘要】:預(yù)應(yīng)力技術(shù)已廣泛應(yīng)用于橋梁結(jié)構(gòu)的建設(shè)當(dāng)中,然而,由于設(shè)計(jì)、施工及運(yùn)營管理方面的不足,在預(yù)應(yīng)力混凝土橋梁快速發(fā)展的同時(shí)也導(dǎo)致了大量的病害,這不僅對(duì)橋梁結(jié)構(gòu)的使用性能產(chǎn)生影響,嚴(yán)重時(shí)更危及到結(jié)構(gòu)的安全。本文針對(duì)既有預(yù)應(yīng)力混凝土橋梁的開裂問題,在實(shí)測裂縫參數(shù)的基礎(chǔ)上,對(duì)主梁各開裂段進(jìn)行分析,評(píng)價(jià)了開裂后預(yù)應(yīng)力混凝土梁中的有效預(yù)應(yīng)力。 本文的研究內(nèi)容主要為以下幾個(gè)方面: 首先,提出了預(yù)應(yīng)力混凝土矩形、T形、箱形截面開裂后有效預(yù)應(yīng)力的分析方法,在給定混凝土受壓區(qū)高度的情況下,得到了截面有效預(yù)應(yīng)力的大小,對(duì)評(píng)價(jià)橋梁中有效預(yù)應(yīng)力的沿程分布提供了理論依據(jù)。 其次,以截面分析作為基礎(chǔ),提供了有效預(yù)應(yīng)力沿程分布的分析方法,并以一片預(yù)應(yīng)力混凝土簡支T梁為例,,建立了在不同荷載等級(jí)下的主梁裂縫分布統(tǒng)計(jì)參數(shù),采用解析分析法計(jì)算得到主梁中的有效預(yù)應(yīng)力。 最后,以一座開裂較嚴(yán)重的預(yù)應(yīng)力混凝土小箱梁作為依托工程,計(jì)算了各張拉控制力等級(jí)下的混凝土受壓區(qū)高度和有效預(yù)應(yīng)力大小,并與實(shí)際裂縫狀況下的有效預(yù)應(yīng)力進(jìn)行了比較。
[Abstract]:Prestressed technology has been widely used in the construction of bridge structures. However, due to the deficiencies in design, construction and operation management, the rapid development of prestressed concrete bridges has also led to a large number of diseases. This not only affects the performance of bridge structure, but also endangers the safety of bridge structure. In view of the cracking problem of the existing prestressed concrete bridge, based on the measured crack parameters, this paper analyzes each crack section of the main beam, and evaluates the effective prestress in the post-cracking prestressed concrete beam. The main contents of this paper are as follows: firstly, an analytical method of effective prestressing force after cracking of rectangular T-shaped and box section of prestressed concrete is proposed. The size of effective prestress of section is obtained, which provides a theoretical basis for evaluating the distribution of effective prestress along the bridge. Secondly, based on the section analysis, the analysis method of effective prestress distribution along the course is provided, and the statistical parameters of crack distribution of the main beam under different load levels are established by taking a prestressed concrete simply supported T beam as an example. The effective prestress in the main beam is calculated by analytic analysis method. Finally, based on a small prestressed concrete box girder with serious cracking, the height of the concrete compression zone and the effective prestressing force under each tension control force grade are calculated. It is compared with the effective prestressing force under the actual crack condition.
【學(xué)位授予單位】:長安大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:U448.35

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