本文選題：預(yù)應(yīng)力混凝土結(jié)構(gòu) + 光纖傳感�。� 參考：《大連理工大學(xué)》2013年碩士論文

【摘要】：預(yù)應(yīng)力混凝土結(jié)構(gòu)中鋼絞線的粘結(jié)保護(hù)方法和應(yīng)力狀態(tài)監(jiān)測一直是工程界亟待解決的問題,而普通的鋼絞線及監(jiān)測手段無法滿足以上需求,本文在內(nèi)嵌FRP智能鋼絞線基礎(chǔ)上,結(jié)合緩粘結(jié)技術(shù)工藝,開發(fā)出一種可取代普通預(yù)應(yīng)力鋼絞線直接布設(shè)于預(yù)應(yīng)力混凝土結(jié)構(gòu)中的智能部品,即緩粘結(jié)預(yù)應(yīng)力智能鋼絞線,并對(duì)大跨預(yù)應(yīng)力混凝土結(jié)構(gòu)進(jìn)行了預(yù)應(yīng)力狀態(tài)監(jiān)測及安全評(píng)估,為結(jié)構(gòu)的預(yù)應(yīng)力狀態(tài)評(píng)價(jià)提供了借鑒與參考。主要研究內(nèi)容包括以下方面： 首先,分析了預(yù)應(yīng)力損失影響因素及評(píng)價(jià)不確定性,提出了以預(yù)應(yīng)力筋應(yīng)變值作為嵌入監(jiān)測目標(biāo)的預(yù)應(yīng)力損失直接監(jiān)測法代替復(fù)雜的分項(xiàng)疊加計(jì)算法；分析了不同荷載下預(yù)應(yīng)力混凝土結(jié)構(gòu)應(yīng)力狀態(tài)及變形情況,采用預(yù)應(yīng)力筋和混凝土控制截面應(yīng)力、內(nèi)力、變形作為工程實(shí)際和理論設(shè)計(jì)對(duì)比指標(biāo)反映預(yù)應(yīng)力設(shè)計(jì)誤差,提出了以正常使用及承載能力狀態(tài)下預(yù)應(yīng)力混凝土結(jié)構(gòu)實(shí)際內(nèi)力安全系數(shù)作為評(píng)價(jià)依據(jù)的安全評(píng)估及預(yù)警方法。 其次,結(jié)合內(nèi)嵌FRP智能鋼絞線與緩粘結(jié)工藝技術(shù),開發(fā)了光纖布里淵型/光纖布拉格光柵型帶肋緩粘結(jié)預(yù)應(yīng)力智能鋼絞線(S-RPSR-OF/FBG),并研究了其基本力學(xué)性能、粘結(jié)錨固性能、材料摩阻性能和相關(guān)智能監(jiān)測性能等,分析得出S-RPSR-OF/FBG不僅繼承了普通預(yù)應(yīng)力鋼絞線軸向抗拉性能強(qiáng)及光纖傳感元件對(duì)應(yīng)變和溫度的感知性能,而且具有施工簡單和安全可靠的緩粘結(jié)技術(shù)特點(diǎn),是集受力與傳感于一體的新型預(yù)應(yīng)力狀態(tài)監(jiān)測智能部品。 最后,通過將曲線形和折線形S-RPSR-OF/FBG應(yīng)用于某甲類劇場建筑大跨度預(yù)應(yīng)力混凝土梁、板預(yù)應(yīng)力監(jiān)測與安全評(píng)估工程中,得到了預(yù)應(yīng)力筋損失分布規(guī)律及有效應(yīng)力時(shí)變性特征,分析了預(yù)應(yīng)力損失因素(κ、μ、θanιf)的實(shí)際影響效果；計(jì)算得出工程實(shí)際與理論設(shè)計(jì)指標(biāo)誤差及實(shí)際內(nèi)力指標(biāo)安全系數(shù),實(shí)現(xiàn)了大跨度預(yù)應(yīng)力混凝土結(jié)構(gòu)的安全評(píng)估；并提出了適于工程應(yīng)用的等效應(yīng)力計(jì)算方法、緩粘結(jié)摩擦系數(shù)確定法及張拉控制措施,為緩粘結(jié)預(yù)應(yīng)力混凝土結(jié)構(gòu)設(shè)計(jì)與施工提供了參考。
[Abstract]:The bond protection method and stress state monitoring of steel strands in prestressed concrete structures have always been an urgent problem to be solved in engineering circles, but the common steel strands and monitoring methods can not meet the above needs. Based on the embedded FRP intelligent steel strands in this paper, Combining with the technology of slow bonding, a kind of intelligent part which can replace the common prestressed steel strand in the prestressed concrete structure is developed, that is, the slowly bonded prestressed intelligent steel strand. The pre-stressed state monitoring and safety evaluation of long-span prestressed concrete structure are carried out, which provides a reference and reference for the pre-stressed state evaluation of the structure. The main contents of the study include the following: Firstly, the influencing factors of prestress loss and the uncertainty of evaluation are analyzed, and the direct monitoring method of prestress loss is put forward to replace the complicated superposition calculation method with the strain value of prestressed tendons as the embedded monitoring target. The stress state and deformation of prestressed concrete structure under different loads are analyzed. The prestressed tendons and concrete are used to control the cross-section stress, internal force and deformation as the comparative indexes of engineering practice and theoretical design to reflect the design error of prestressing force. Based on the actual internal force safety factor of prestressed concrete structure under normal use and bearing capacity, the method of safety assessment and early warning is put forward. Secondly, combining with the technology of embedded FRP intelligent strand and slow bonding technology, the fiber Brillouin type / fiber Bragg grating type prestressed intelligent steel strand S-RPSR-OF / FBGG is developed, and its basic mechanical properties and bond anchoring properties are studied. The properties of material friction and related intelligent monitoring are analyzed. It is concluded that S-RPSR-OF/FBG not only inherits the axial tensile properties of common prestressed steel strands, but also the sensing properties of fiber optic sensing elements to strain and temperature. It has the characteristics of simple construction and safe and reliable slow bonding technology. It is a new intelligent part of prestressing state monitoring which integrates force and sensor. Finally, through the application of curved and folded S-RPSR-OF/FBG to the prestressed concrete beam with large span in a class A theater building, the distribution law of the loss of prestressed tendons and the time-varying characteristics of effective stress are obtained. The actual effect of the factors of prestress loss (魏, 渭, 胃 an l f) is analyzed, the error of engineering practical and theoretical design index and the safety factor of actual internal force index are calculated, and the safety evaluation of long-span prestressed concrete structure is realized. The equivalent stress calculation method, the method of determining the friction coefficient of slow bond and the tensioning control measures are put forward, which provide a reference for the design and construction of slowly bonded prestressed concrete structure.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU378;TU317

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