港口工程高樁碼頭結(jié)構(gòu)性能退化研究
發(fā)布時(shí)間：2018-07-23 19:18
【摘要】：處于嚴(yán)酷海洋環(huán)境中的港口工程結(jié)構(gòu),直接或間接都受到波浪、風(fēng)、水流還有氯鹽侵蝕作用,結(jié)構(gòu)性能退化問(wèn)題尤為嚴(yán)重。開(kāi)展港口工程高樁碼頭結(jié)構(gòu)性能退化的研究,掌握其退化規(guī)律,對(duì)結(jié)構(gòu)性能從定性到定量的分析,不僅與結(jié)構(gòu)的安全性密切相關(guān),而且有助于已有結(jié)構(gòu)的性能評(píng)定,選擇正確的結(jié)構(gòu)修復(fù)處理方法和定期維護(hù)方案,確保結(jié)構(gòu)的正常工作,具有重要的現(xiàn)實(shí)意義和經(jīng)濟(jì)價(jià)值。首先,本文開(kāi)展了典型港口工程鋼筋混凝土結(jié)構(gòu)性能退化狀況的現(xiàn)場(chǎng)調(diào)研,對(duì)其影響因素進(jìn)行了總結(jié)和分析,進(jìn)行了海洋環(huán)境下高樁碼頭結(jié)構(gòu)性能退化主要影響因素識(shí)別。確定了在結(jié)構(gòu)型式上,高樁梁板式碼頭結(jié)構(gòu)為主要研究對(duì)象,在退化形式上,鋼筋銹蝕引起的構(gòu)件安全性和適用性退化、氯離子侵蝕引起的耐久性退化和樁基水平承載性能引起的整體結(jié)構(gòu)性能退化為高樁碼頭結(jié)構(gòu)的主要退化形式,為進(jìn)一步研究高樁結(jié)構(gòu)性能退化規(guī)律提供了依據(jù)和方向。其次,開(kāi)展了不同應(yīng)力狀態(tài)下不同銹蝕程度的鋼筋混凝土梁電解液加速腐蝕試驗(yàn),研究了持續(xù)應(yīng)力狀態(tài)下鋼筋銹蝕對(duì)混凝土構(gòu)件的影響,并開(kāi)展了銹蝕鋼筋混凝土構(gòu)件的結(jié)構(gòu)力學(xué)性能試驗(yàn),對(duì)不同銹蝕率的試驗(yàn)梁的破壞形態(tài)、裂縫開(kāi)展?fàn)顩r、截面應(yīng)變等進(jìn)行了測(cè)試和分析。建立了不均勻銹蝕情況下,基于銹脹裂縫寬度并考慮相鄰測(cè)點(diǎn)相互影響的鋼筋最大銹蝕率計(jì)算模型,將外觀(guān)可視、易測(cè)的銹脹裂縫寬度與鋼筋銹蝕率定量地聯(lián)系起來(lái),可以實(shí)現(xiàn)從外觀(guān)檢測(cè)到結(jié)構(gòu)性能退化預(yù)測(cè)的定量計(jì)算。給出了基于鋼筋銹蝕率的鋼筋混凝土梁抗彎承載力、抗彎剛度和構(gòu)件延性退化計(jì)算方法,并提出了銹蝕率梁危險(xiǎn)截面位置預(yù)測(cè)和結(jié)構(gòu)性能退化評(píng)估流程,為港口工程高樁碼頭結(jié)構(gòu)提供更加科學(xué)合理的設(shè)計(jì)和維護(hù)依據(jù)。再次,選取高樁碼頭中廣泛使用的后張法預(yù)應(yīng)力混凝土大直徑管樁和先張法預(yù)應(yīng)力高強(qiáng)混凝土管樁作為基礎(chǔ)結(jié)構(gòu)代表研究其耐久性的退化規(guī)律。通過(guò)開(kāi)展室內(nèi)試驗(yàn)研究樁基礎(chǔ)的混凝土本體的耐久性,獲得耐久性退化的初始邊界條件;通過(guò)對(duì)服役1~17年的大管樁和PHC管樁的現(xiàn)場(chǎng)調(diào)研和樁身鉆孔取樣,結(jié)合室內(nèi)化學(xué)試驗(yàn),測(cè)試分析了不同取樣深度下樁身混凝土的氯離子含量,得到了不同環(huán)境和服役時(shí)間對(duì)管樁氯離子擴(kuò)散系數(shù)和腐蝕參數(shù)等耐久性指標(biāo)的影響,在大量現(xiàn)場(chǎng)取樣數(shù)據(jù)統(tǒng)計(jì)分析的基礎(chǔ)上,建立了大管樁和PHC管樁耐久性退化模型。最后,在大量高樁碼頭樁基試樁資料的基礎(chǔ)上,分析了大位移情況下樁基水平受力過(guò)程中樁身的剛度退化和樁周土體抗力退化規(guī)律,擬合確定了適合于不同土質(zhì)條件的土體抗力系數(shù)與樁基在泥面處水平位移的指數(shù)退化關(guān)系,為在不同水平荷載作用下合理選取土體抗力系數(shù)供了可靠的理論計(jì)算依據(jù)。本文研究成果豐富和完善了港口工程高樁碼頭結(jié)構(gòu)性能退化的內(nèi)容和方法,也為港口工程結(jié)構(gòu)全壽命設(shè)計(jì)從理論研究推進(jìn)到應(yīng)用方法研究奠定了基礎(chǔ),同時(shí)也可為港口工程結(jié)構(gòu)提供設(shè)計(jì)、施工、檢測(cè)和維護(hù)方法等方面的指導(dǎo)。
[Abstract]:The port engineering structure in the harsh marine environment is directly or indirectly affected by the erosion of waves, wind, water and chlorine, and the degradation of structure and performance is particularly serious. It is closely related to the property, and helps to evaluate the performance of the existing structures, select the correct structural repair methods and regular maintenance schemes, and ensure the normal work of the structure. It is of great practical significance and economic value. First, the field investigation of the performance degradation of the reinforced concrete structure in the typical port engineering is carried out in this paper. The factors are summarized and analyzed, and the main factors that affect the structural performance degradation of High Pile Wharf under marine environment are identified. In the structure type, the structure of the high pile beam and plate wharf is the main research object. In the degenerate form, the safety and applicability of the member caused by the corrosion of the steel bar and the durability of the chloride ion erosion caused by the corrosion of the steel. The overall structural performance caused by the horizontal bearing performance of the pile and the pile foundation is degenerated to the main degenerate form of the high pile wharf structure, which provides the basis and direction for further research on the law of the performance degradation of high pile structures. Secondly, the accelerated corrosion test of the electrolyte of reinforced concrete beams with different corrosion degrees in different stress states is carried out, and the continuation of the corrosion test is carried out. The effect of steel corrosion on the concrete members under stress state, and the structural mechanical properties test of corroded reinforced concrete members are carried out. The failure forms of the test beams with different corrosion rates, the conditions of crack development, and the strain of the cross section are tested and analyzed. The width of the crack expansion cracks is established and the phase is considered under the condition of uneven corrosion. The calculation model of the maximum corrosion rate of steel bar affected by adjacent sites, which can be seen in appearance, is connected with the corrosion rate of the steel bar, and the quantitative calculation of the prediction of structural performance degradation from appearance detection can be realized. The bending bearing capacity, flexural rigidity and components of steel reinforced concrete beams based on the corrosion rate of steel bars are given. In order to provide more scientific and reasonable design and maintenance basis for the structure of the port engineering high pile wharf, the post tensioned post tensioned concrete large diameter pipe pile and the pretensioned prestressing force are selected. The strong concrete pipe pile as the foundation structure represents the degradation law of its durability. Through the indoor test, the durability of the concrete body of the pile foundation is studied, and the initial boundary conditions for the durability degradation are obtained. Through the field investigation of the large pipe pile and the PHC pipe pile in the service 1~17 years, the sampling of the pile bore hole and the indoor chemical test, The chlorine ion content of pile concrete under different sampling depth was tested and analyzed. The effect of different environment and service time on the durability index of chloride diffusion coefficient and corrosion parameter of pipe pile was obtained. On the basis of a large number of field sampling data, the durability degradation model of large pipe pile and PHC pipe pile was established. On the basis of pile foundation pile test data of high pile wharf, the stiffness degradation of pile body and the law of soil resistance degradation in pile foundation under large displacement are analyzed. The relationship between soil resistance coefficient and horizontal displacement of pile foundation at the mud surface is determined by fitting for different soil conditions. The results of this study enrich and improve the content and method of the structural performance degradation of the port engineering high pile wharf. It also lays a foundation for the whole life design of the port engineering structure from the theoretical research to the application method, and can also be a port engineering structure. Provide guidance on design, construction, testing and maintenance methods.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U656.113
[Abstract]:The port engineering structure in the harsh marine environment is directly or indirectly affected by the erosion of waves, wind, water and chlorine, and the degradation of structure and performance is particularly serious. It is closely related to the property, and helps to evaluate the performance of the existing structures, select the correct structural repair methods and regular maintenance schemes, and ensure the normal work of the structure. It is of great practical significance and economic value. First, the field investigation of the performance degradation of the reinforced concrete structure in the typical port engineering is carried out in this paper. The factors are summarized and analyzed, and the main factors that affect the structural performance degradation of High Pile Wharf under marine environment are identified. In the structure type, the structure of the high pile beam and plate wharf is the main research object. In the degenerate form, the safety and applicability of the member caused by the corrosion of the steel bar and the durability of the chloride ion erosion caused by the corrosion of the steel. The overall structural performance caused by the horizontal bearing performance of the pile and the pile foundation is degenerated to the main degenerate form of the high pile wharf structure, which provides the basis and direction for further research on the law of the performance degradation of high pile structures. Secondly, the accelerated corrosion test of the electrolyte of reinforced concrete beams with different corrosion degrees in different stress states is carried out, and the continuation of the corrosion test is carried out. The effect of steel corrosion on the concrete members under stress state, and the structural mechanical properties test of corroded reinforced concrete members are carried out. The failure forms of the test beams with different corrosion rates, the conditions of crack development, and the strain of the cross section are tested and analyzed. The width of the crack expansion cracks is established and the phase is considered under the condition of uneven corrosion. The calculation model of the maximum corrosion rate of steel bar affected by adjacent sites, which can be seen in appearance, is connected with the corrosion rate of the steel bar, and the quantitative calculation of the prediction of structural performance degradation from appearance detection can be realized. The bending bearing capacity, flexural rigidity and components of steel reinforced concrete beams based on the corrosion rate of steel bars are given. In order to provide more scientific and reasonable design and maintenance basis for the structure of the port engineering high pile wharf, the post tensioned post tensioned concrete large diameter pipe pile and the pretensioned prestressing force are selected. The strong concrete pipe pile as the foundation structure represents the degradation law of its durability. Through the indoor test, the durability of the concrete body of the pile foundation is studied, and the initial boundary conditions for the durability degradation are obtained. Through the field investigation of the large pipe pile and the PHC pipe pile in the service 1~17 years, the sampling of the pile bore hole and the indoor chemical test, The chlorine ion content of pile concrete under different sampling depth was tested and analyzed. The effect of different environment and service time on the durability index of chloride diffusion coefficient and corrosion parameter of pipe pile was obtained. On the basis of a large number of field sampling data, the durability degradation model of large pipe pile and PHC pipe pile was established. On the basis of pile foundation pile test data of high pile wharf, the stiffness degradation of pile body and the law of soil resistance degradation in pile foundation under large displacement are analyzed. The relationship between soil resistance coefficient and horizontal displacement of pile foundation at the mud surface is determined by fitting for different soil conditions. The results of this study enrich and improve the content and method of the structural performance degradation of the port engineering high pile wharf. It also lays a foundation for the whole life design of the port engineering structure from the theoretical research to the application method, and can also be a port engineering structure. Provide guidance on design, construction, testing and maintenance methods.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U656.113
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