本文選題：預(yù)應(yīng)力混凝土梁橋　切入點(diǎn)：承載力退化　出處：《鄭州大學(xué)》2014年碩士論文

【摘要】：預(yù)應(yīng)力混凝土梁橋面臨著自身性能退化、交通量急速增長(zhǎng)以及車(chē)輛超載超限等情況，不少橋梁出現(xiàn)了耐久性下降、承載力退化等問(wèn)題。國(guó)內(nèi)外學(xué)者已對(duì)混凝土碳化深度、氯離子侵蝕、普通鋼筋銹蝕程度等方面開(kāi)展了研究，取得了許多成果，但是針對(duì)高強(qiáng)度預(yù)應(yīng)力混凝土結(jié)構(gòu)的研究成果較少。因此，開(kāi)展預(yù)應(yīng)力混凝土梁橋承載力退化研究，具有十分重要的意義。 本文以鄭少高速公路連接線(xiàn)南水北調(diào)大橋輔線(xiàn)橋?yàn)橐劳泄こ�，通過(guò)對(duì)比分析不同的混凝土碳化模型，并結(jié)合預(yù)應(yīng)力混凝土梁橋的特點(diǎn)，選取了考慮混凝土的養(yǎng)護(hù)條件、摻合料的摻量以及環(huán)境條件影響、以“水灰比和水泥用量”為主要參數(shù)的混凝土碳化深度預(yù)測(cè)公式；提出了考慮多重因素影響的氯離子擴(kuò)散系數(shù)模型；分別進(jìn)行了混凝土碳化作用和除冰鹽中氯離子侵蝕兩種環(huán)境下的普通鋼筋銹蝕和預(yù)應(yīng)力鋼絞線(xiàn)腐蝕的預(yù)測(cè)研究，給出了普通鋼筋銹蝕和預(yù)應(yīng)力鋼絞線(xiàn)腐蝕的預(yù)測(cè)模型；分別選取主梁跨中截面和1/4處截面，對(duì)依托工程在混凝土碳化作用和除冰鹽中氯離子侵蝕兩種環(huán)境下設(shè)計(jì)基準(zhǔn)期內(nèi)的承載力進(jìn)行了預(yù)測(cè)。本文完成的主要工作和所得結(jié)論： 1.對(duì)比分析了不同混凝土碳化深度預(yù)測(cè)模型，通過(guò)與快速碳化試驗(yàn)值、工程碳化深度實(shí)測(cè)值的比較，得出張譽(yù)模型和牛荻濤模型優(yōu)于同類(lèi)其它模型；綜合考慮各影響因素后，對(duì)張譽(yù)模型進(jìn)行了修正和驗(yàn)證，使修正后的張譽(yù)模型更適合預(yù)測(cè)河南省地域內(nèi)的預(yù)應(yīng)力混凝土梁橋的碳化深度。 2.歸納總結(jié)了影響氯離子擴(kuò)散系數(shù)的主要因素，綜合考慮水灰比、摻合料種類(lèi)及含量、時(shí)間、溫度、混凝土對(duì)氯離子的結(jié)合能力、混凝土材料自身劣化以及應(yīng)力水平諸多因素的影響，提出了考慮多因素影響的氯離子擴(kuò)散系數(shù)模型，并結(jié)合工程實(shí)例驗(yàn)證了該模型的實(shí)用性。 3.對(duì)比分析了碳化作用下的不同鋼筋銹蝕模型，并給出了模型的使用建議；總結(jié)給出了氯離子侵蝕環(huán)境下的鋼筋銹蝕模型；在相同條件下，氯離子侵蝕比混凝土碳化對(duì)鋼筋銹蝕的危害要嚴(yán)重得多；對(duì)比分析了銹蝕鋼筋強(qiáng)度退化系數(shù)和兩類(lèi)協(xié)同工作系數(shù)，給出了協(xié)同工作降低系數(shù)的適用情況。 4.結(jié)合先張法和后張法施工構(gòu)件的各自特點(diǎn)，分別給出了采用先張法、后張法施工的預(yù)應(yīng)力混凝土梁橋在混凝土碳化和除冰鹽中氯離子侵蝕兩種環(huán)境作用下的鋼絞線(xiàn)腐蝕計(jì)算模型，選取了合適的腐蝕鋼絞線(xiàn)有效截面積、強(qiáng)度以及與混凝土協(xié)同工作系數(shù)計(jì)算公式，依據(jù)規(guī)范，分別建立了銹蝕預(yù)應(yīng)力混凝土梁抗彎承載力和斜截面抗剪承載力的計(jì)算方法。 5.對(duì)依托工程在混凝土碳化作用和除冰鹽中氯離子侵蝕兩種環(huán)境下設(shè)計(jì)基準(zhǔn)期內(nèi)的承載力進(jìn)行了預(yù)測(cè)：不考慮施工因素和超載等導(dǎo)致混凝土開(kāi)裂的情況，在混凝土碳化作用下，抗彎承載力保持較高水平，斜截面抗剪承載力有所退化但并不顯著，承載力滿(mǎn)足設(shè)計(jì)要求；除冰鹽中氯離子侵蝕環(huán)境下，預(yù)應(yīng)力鋼絞線(xiàn)腐蝕發(fā)生尤其是鋼絞線(xiàn)銹脹開(kāi)裂后，抗彎承載力有一定程度退化，箍筋銹脹開(kāi)裂后，，斜截面抗剪承載力有一定程度退化。
[Abstract]:The prestressed concrete beam bridge is facing its own performance degradation, the rapid growth of traffic volume and vehicle overload, many bridges durability decreased degradation capacity. Domestic and foreign scholars have been on the carbonation depth of concrete, chloride ion corrosion, general corrosion degree of reinforcing bar etc., made many achievements but according to the research results of high strength prestressed concrete structure is less. Therefore, to carry out the study on the degradation of prestressed concrete beam bridge bearing capacity, it has very important significance.
In this paper, Zheng Shao Expressway connecting line of South to north water diversion line bridge bridge project, through the comparative analysis of different concrete carbonation model, combined with the characteristics of prestressed concrete beam bridge, selected considering the concrete curing conditions, effects of admixture dosage and environmental conditions, the prediction formula of concrete carbonation depth with water cement ratio and the amount of cement as the main parameters of the proposed model; coefficient of chloride ion diffusion considering multiple factors were carried out; the role of concrete carbonation and the prediction of two kinds of environment of ordinary steel bar corrosion and corrosion of prestressed steel strand in ice and salt chloride, presented the prediction model of ordinary reinforced and prestressed steel corrosion corrosion; selected girder section and 1/4 cross section in, based on the engineering in the concrete carbonation and deicing salt chloride two ring The bearing capacity of the design reference period is predicted. The main work and conclusions completed in this paper are as follows:
1. comparative analysis of the different prediction models of concrete carbonation depth, with the rapid carbonization test value, compare the carbonation depth measured value, the Zhang Yu model and other Niu Ditao models is better than similar; considering all the factors, the Zhang Yu model was revised and verified, the modified model more Zhang Yu suitable for the carbonation depth of prestressed concrete beam bridge in Henan Province in the region.
2. summarizes the main factors influencing the chloride ion diffusion coefficient, considering the water cement ratio, admixture type and concentration, time, temperature, binding capacity of concrete to chloride ion, the effect of concrete material deterioration and stress level of many factors, put forward the coefficient model considering many factors influence the chloride ion diffusion and combined with the engineering examples to verify the practicability of the model.
3. comparative analysis of the different corrosion model of carbonation, and gives the suggestions of using the model is summarized.; corrosion model chlorideenvironment; under the same conditions, the erosion of chloride ions than harm concrete carbonation of steel corrosion is more serious; comparative analysis of the strength of corroded reinforcement and degradation coefficient two kinds of coordination coefficient, given the reduced coefficient for collaborative work.
4. combining the features of pretensioned and post tensioned members, the paper gives the pretensioning method, post tensioned prestressed concrete bridge in concrete carbonation and deicing salt chloride corrosion of two kinds of steel wire under the action of the environment model, selects the appropriate and effective section of corroded steel strands area, and concrete strength and coordination coefficient calculation formula are established according to the specification, the shear bearing capacity calculation method of the bearing capacity of inclined section and bending corrosion of prestressed concrete beam.
5. on the effect on the carbonation of concrete and in addition to predict the bearing capacity design reference period of two environmental ice salt chloride contamination: without considering the construction factors and overload lead to concrete cracking, in the role of the carbonation of concrete under bending, maintain a high level of bearing capacity, shear capacity the force has deteriorated but not significant, meet the design requirements of the bearing capacity; deicing salt in chloride environment, the corrosion of prestressed steel strand occurred especially steel wire cracking, bending bearing capacity with a certain degree of degradation, hoop rust expansion cracking, bearing capacity of a certain degree of degradation of shear.

【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U441;U448.35

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