本文關(guān)鍵詞： 波形鋼腹板 體外預(yù)應(yīng)力 應(yīng)力增量 模型試驗(yàn) 有限元分析　出處：《蘭州交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：將波形折疊的鋼板用作箱梁的腹板,從截面形成來說是一種創(chuàng)新性的組合結(jié)構(gòu),即波形鋼腹板組合箱梁。波形鋼腹板組合箱梁橋具有諸多傳統(tǒng)箱梁橋所不具有的優(yōu)點(diǎn),也有一些固有的缺點(diǎn)。隨著此類結(jié)構(gòu)的研究改進(jìn)和施工技術(shù)的改善,這類橋受到了國內(nèi)外設(shè)計(jì)建設(shè)者和研究者的青睞。然而,從現(xiàn)有資料看,對波形鋼腹板組合箱梁體外預(yù)應(yīng)力的研究較少。本文在參閱國內(nèi)外大量試驗(yàn)研究資料、設(shè)計(jì)規(guī)范以及相關(guān)文獻(xiàn)的基礎(chǔ)上,進(jìn)行了波形鋼腹板組合箱梁模型試驗(yàn)體外預(yù)應(yīng)力筋的分析研究,推導(dǎo)了基于撓度的體外預(yù)應(yīng)力應(yīng)力增量計(jì)算公式。此外,用大型有限元軟件MIDAS/FEA建立波形鋼腹板組合箱梁有限元模型,對波形鋼腹板組合箱梁的試驗(yàn)梁和有限元模型值進(jìn)行對比,進(jìn)行了加載全過程的應(yīng)力增量的分析,以及影響波形鋼腹板組合箱梁體外預(yù)應(yīng)力增量因素的分析。主要工作包括以下幾個(gè)方面:(1)查閱相關(guān)文獻(xiàn),了解波形鋼腹板組合箱梁和體外預(yù)應(yīng)力混凝土結(jié)構(gòu)構(gòu)造以及目前國內(nèi)外的發(fā)展研究現(xiàn)狀。(2)介紹了波形鋼腹板組合箱梁橋的基本力學(xué)性能和與體外預(yù)應(yīng)力筋應(yīng)力相關(guān)的理論。(3)進(jìn)行波形鋼腹板模型試驗(yàn)梁的精心設(shè)計(jì)、制作及靜載試驗(yàn)。試驗(yàn)中主要進(jìn)行了不同工況下梁的跨中撓度和體外預(yù)應(yīng)力筋的應(yīng)力值的數(shù)據(jù)采集,并對試驗(yàn)結(jié)果進(jìn)行了分析。試驗(yàn)結(jié)果分析表明,在彈性階段,梁跨中撓度和體外預(yù)應(yīng)力筋的應(yīng)力增量與荷載呈直線或近似直線關(guān)系。(4)根據(jù)體外預(yù)應(yīng)力混凝土結(jié)構(gòu)撓度和體外預(yù)應(yīng)力筋應(yīng)力增量變化關(guān)系,推導(dǎo)了直線布筋和折線布筋分別在不同荷載作用下的力筋應(yīng)力增量計(jì)算公式。用推導(dǎo)出的體外預(yù)應(yīng)力應(yīng)力增量公式計(jì)算本次試驗(yàn)梁并與實(shí)測數(shù)據(jù)進(jìn)行對比,對比發(fā)現(xiàn)結(jié)果很接近,這種計(jì)算公式對波形鋼腹板組合箱梁體外預(yù)應(yīng)力增量的計(jì)算是切實(shí)可行的。(5)通過選取合理的單元類型和材料屬性,用MIDAS/FEA建立本次模型試驗(yàn)梁的有限元模型。有限元計(jì)算結(jié)果表明,軟件計(jì)算結(jié)果和試驗(yàn)梁的實(shí)驗(yàn)數(shù)據(jù)分析結(jié)果相互吻合良好,這種波形鋼腹板組合箱梁橋的建模方式是較為準(zhǔn)確的。(6)用軟件模擬了試驗(yàn)梁從一開始加載到結(jié)構(gòu)破壞的全過程中體外預(yù)應(yīng)力應(yīng)力增量的變化情況,結(jié)果表明:結(jié)構(gòu)在混凝土開裂前彈性階段,體外預(yù)應(yīng)力應(yīng)力增量及跨中撓度與荷載呈線性關(guān)系;隨著荷載的不斷增大,混凝土開裂,跨中撓度和體外預(yù)應(yīng)力應(yīng)力增量增大較快,結(jié)構(gòu)剛度明顯降低,受拉區(qū)鋼筋還處于彈性范圍內(nèi),體外預(yù)應(yīng)力應(yīng)力增量及跨中撓度與荷載還呈線性關(guān)系;結(jié)構(gòu)進(jìn)入塑形階段,受拉區(qū)鋼筋屈服,撓度和體外預(yù)應(yīng)力應(yīng)力增量急劇增大,體外預(yù)應(yīng)力應(yīng)力增量及跨中撓度與荷載變?yōu)榍�關(guān)系。(7)用MIDAS/FEA建立影響波形鋼腹板體外預(yù)應(yīng)力筋應(yīng)力增量不同參數(shù)的模型,通過分析了可知:對預(yù)應(yīng)力增量影響大的因素為鋼筋屈服強(qiáng)度、受拉區(qū)普通鋼筋的配筋率及混凝土強(qiáng)度等級,而鋼腹板厚度、鋼材屈服強(qiáng)度、力筋張拉力和預(yù)應(yīng)力配筋率對波形鋼腹板體外預(yù)應(yīng)力應(yīng)力增量影響不大。
[Abstract]:The folding wave plate used as a box girder web, from the cross section form is an innovative composite structure, the composite box girder with corrugated steel webs. The box girder with corrugated steel webs has many advantages of traditional box girder bridge has not, there are some inherent shortcomings. With the improvement of technology and construction this kind of structure improvement, this kind of bridge by domestic and foreign design builders and researchers' attention. However, at present, the research of prestressed composite box girder with corrugated steel webs was less. In this paper refer to a large number of domestic and foreign research data base, design specification and related documents, the analysis of Prestressed composite box girder with corrugated steel webs model test in vitro, derived in vitro prestressed deflection based on stress increment formula. In addition, the establishment of corrugated steel webs with large finite element software MIDAS/FEA Beam finite element model of composite box of composite box girder with corrugated steel web beam test and finite element model were compared, the analysis of the stress increment of the whole process of loading, as well as the analysis of box girder with corrugated steel webs of external prestressed incremental factors. The main work includes the following aspects: (1) check the relevant literature, structure of composite box girder with corrugated steel webs and externally prestressed concrete structure and the domestic and international research status and development of understanding. (2) introduces the basic mechanical properties of box girder with corrugated steel webs and the theory of stress associated with external tendons. (3) a careful design model of corrugated steel web beams the making and the static load test. The main experiment conducted under different working conditions of beam deflection and stress of external prestressed tendons is the value of data acquisition, and the test results were analyzed. The test results Show that in the elastic phase, beam deflection and stress increment of external prestressed tendons is linear or approximately linear relation with the load. (4) according to the external prestressed concrete structure deflection and tendon stress increment, derived the calculation formula of straight line and broken line reinforcement reinforcement respectively under different loads the stress increment calculation. The test beam and compared with measured data with external prestressing derived stress increment formula, the comparison result is very close, the calculation formula of box girder with corrugated steel webs in vitro pre calculation of stress increment is feasible. (5) through the unit type and the reasonable selection of material properties, the finite element model of test beams with MIDAS/FEA finite element model. The calculation results show that the calculation results and experimental data of test beam analysis results are in good agreement with each other, this Modeling method for box girder with corrugated steel webs is more accurate. (6) use software to simulate the whole process of external prestressing test Liang Congyi began to destroy the structure of load changes, the results show that the stress increment before cracking in concrete structure in elastic stage, external prestress increment of stress and deflection with load is linear; with the increasing of load, the crack deflection and the stress increment of external prestressing increases faster, structural stiffness decreased, the tensile steel is in the elastic range, the stress increment of external prestressing and deflection and load is linear; structure into the shaping stage. The tensile steel yield, deflection and stress increment of external prestressing increases rapidly, prestressing stress increment and deflection and load change curve. (7) the establishment of effect of corrugated steel webs MIDAS/FEA In vitro prestressed tendons stress increment of different parameters of the model, through the analysis of the factors that affect the yield strength of steel for prestress increment, the tension zone of ordinary steel reinforcement ratio and concrete strength, and steel plate thickness, steel yield strength, tensile force of prestressed tendons and the reinforcement ratio of prestressed corrugated steel webs should not affect the stress increment in vitro.

【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U448.216

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本文編號：1534799