【摘要】：無粘結(jié)預(yù)應(yīng)力混凝土目前正在被廣泛的應(yīng)用于連續(xù)梁等土建結(jié)構(gòu)中,是建筑工程不可缺少的一種新型技術(shù)。它不僅使結(jié)構(gòu)性能優(yōu)越適應(yīng)性好,而且能發(fā)揮材料的潛能,加快了施工進(jìn)度,節(jié)約了成本具有較高的經(jīng)濟(jì)效益。盡管預(yù)應(yīng)力混凝土連續(xù)梁結(jié)構(gòu)具有跨高大,相對截面小,控制截面的內(nèi)力顯著大于同規(guī)格普通鋼筋混凝土連續(xù)梁的特點,采用一定量的預(yù)應(yīng)力筋,仍無法避免支座的控制截面非預(yù)應(yīng)力鋼筋用量大,導(dǎo)致鋼材浪費,施工難度大的問題。目前廣泛應(yīng)用于預(yù)應(yīng)力混凝土結(jié)構(gòu)的塑性設(shè)計方法均是基于有粘結(jié)預(yù)應(yīng)力混凝土結(jié)構(gòu)特點所建立,其適用性具有一定的局限性。因此,開展無粘結(jié)預(yù)應(yīng)力混凝土結(jié)構(gòu)連續(xù)梁結(jié)構(gòu)截面曲率延性系數(shù)定量定性的研究,并建立適于該結(jié)構(gòu)的塑性設(shè)計方法,具有重要的理論及現(xiàn)實意義。本文以預(yù)應(yīng)力混凝土結(jié)構(gòu)設(shè)計的常用方法為理論基礎(chǔ),選取張拉引起次彎矩secM與外載彎矩設(shè)計值loadM之和為超靜定預(yù)應(yīng)力混凝土結(jié)構(gòu)彎矩調(diào)幅對象;應(yīng)用試驗數(shù)據(jù)和計算機(jī)模擬技術(shù),構(gòu)建了無粘結(jié)預(yù)應(yīng)力混凝土連續(xù)梁彎矩調(diào)幅系數(shù)和無粘結(jié)預(yù)應(yīng)力混凝土受彎構(gòu)件截面曲率延性系數(shù)計算模型,同時對等效塑性鉸的長度的度量方法進(jìn)行了完善和改進(jìn);提出了適用于無粘結(jié)預(yù)應(yīng)力混凝土連續(xù)梁結(jié)構(gòu)的塑性設(shè)計方法。本研究成果能夠?qū)o粘結(jié)預(yù)應(yīng)力混凝土連續(xù)梁的塑性設(shè)計提供有力的理論依據(jù)和技術(shù)支持,具有廣闊的推廣和應(yīng)用前景。
[Abstract]:Unbonded prestressed concrete (unbonded prestressed concrete) is widely used in civil structures such as continuous beams, which is an indispensable new technology in building engineering. It not only makes the structure superior and adaptable, but also can give full play to the potential of materials, accelerate the construction progress and save the cost with high economic benefit. Although the prestressed concrete continuous beam structure has the characteristics of large span and small relative section, the internal force of the control section is significantly larger than that of the common reinforced concrete continuous beam of the same specification, and a certain amount of prestressed tendons are used. It is still impossible to avoid the problem of steel wastage and construction difficulty caused by the large amount of non-prestressed steel bar used in the control section of the bearing. At present, the plastic design methods widely used in prestressed concrete structures are based on the characteristics of bonded prestressed concrete structures, and their applicability is limited. Therefore, it is of great theoretical and practical significance to study the quantitative qualitative analysis of curvature ductility coefficient of unbonded prestressed concrete continuous beam structure and to establish a plastic design method suitable for the structure. Based on the common methods of prestressed concrete structure design, this paper selects the sum of the secondary moment secM caused by tensioning and the design value of external load moment loadM as the amplitude modulation object of the moment of statically indeterminate prestressed concrete structure. Based on the experimental data and computer simulation technology, the calculation models of moment amplitude modulation coefficient of unbonded prestressed concrete continuous beam and curvature ductility coefficient of unbonded prestressed concrete flexural members are established. At the same time, the method of measuring the length of equivalent plastic hinge is improved, and the plastic design method suitable for unbonded prestressed concrete continuous beam structure is proposed. The research results can provide a strong theoretical basis and technical support for the plastic design of unbonded prestressed concrete continuous beams, and have a broad prospect of popularization and application.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU378.2

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