本文關(guān)鍵詞：后張有粘結(jié)預(yù)應(yīng)力結(jié)構(gòu)施工和服役期監(jiān)測與仿真分析　出處：《遼寧工程技術(shù)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 后張有粘結(jié)預(yù)應(yīng)力結(jié)構(gòu) 反拱度 預(yù)應(yīng)力損失 施工期監(jiān)測 服役期仿真分析

【摘要】：預(yù)應(yīng)力混凝土結(jié)構(gòu)已經(jīng)逐漸成為建筑結(jié)構(gòu)的發(fā)展趨勢。在大跨度預(yù)應(yīng)力混凝土結(jié)構(gòu)中,預(yù)應(yīng)力筋多以拋物線形式布置,為了使預(yù)應(yīng)力鋼筋束充分發(fā)揮其作用,可以采用四段拋物線法布筋,然而由于這種方法在施工時很復(fù)雜、波紋管在綁扎時也要符合四段拋物線的形式,導(dǎo)致該方法在實際工程應(yīng)用中還未能廣泛應(yīng)用。另外,由于預(yù)應(yīng)力結(jié)構(gòu)的各項損失將直接影響到鋼筋束中建立的預(yù)應(yīng)力,也會影響到預(yù)應(yīng)力結(jié)構(gòu)的性能,再加上結(jié)構(gòu)在永久荷載和可變荷載長期作用下易受損壞,其相應(yīng)的承載力和剛度會隨著時間的增加而降低。這不僅會影響到建筑物的正常使用,也會縮短建筑物的壽命,進而影響到建筑物的安全。因此,有必要對大型公共建筑進行施工期監(jiān)測和服役期監(jiān)測,對建筑物的健康狀況進行評估,并作出相應(yīng)的工程決策,從而對該結(jié)構(gòu)進行預(yù)警、報警以及保養(yǎng)、維修與加固。本文以阜新市規(guī)劃展示館、博物展示館和市民活動中心(簡稱“兩館一心”)為背景,對博物展示館部分預(yù)應(yīng)力構(gòu)件進行監(jiān)測研究,主要包括以下內(nèi)容：(1)從理論上對預(yù)應(yīng)力混凝土結(jié)構(gòu)在施工期間和服役期產(chǎn)生的預(yù)應(yīng)力損失進行分析,重點分析了后張法施工時產(chǎn)生的預(yù)應(yīng)力損失,并針對“兩館一心”中一后張有粘結(jié)預(yù)應(yīng)力混凝土梁的各項損失進行理論計算。(2)在施工階段,對“兩館一心”工程中采用四段拋物線布筋的主梁進行反拱度理論計算和現(xiàn)場實測,以檢驗預(yù)應(yīng)力張拉的施工質(zhì)量。并采用有限元軟件ADINA進行反拱度數(shù)值模擬研究,將模擬值、理論值和監(jiān)測值相比較,驗證有限元軟件模擬預(yù)應(yīng)力結(jié)構(gòu)的可行性。(3)在服役階段,對整個預(yù)應(yīng)力結(jié)構(gòu)進行數(shù)值模擬研究,通過模擬分析各預(yù)應(yīng)力梁產(chǎn)生不同的預(yù)應(yīng)力損失,分析該損失對梁自身的撓度以及對結(jié)構(gòu)其它梁的撓度產(chǎn)生的影響,確定各梁在服役期充當(dāng)?shù)慕巧?以此作為服役期監(jiān)測的判斷標準。(4)通過預(yù)埋在錨下的傳感器,實時采集預(yù)應(yīng)力梁的錨下應(yīng)力,經(jīng)由數(shù)據(jù)采集系統(tǒng)將采集到的數(shù)據(jù)統(tǒng)一收集到存儲設(shè)備中,依據(jù)數(shù)值模擬的結(jié)果,當(dāng)各梁錨下應(yīng)力變化時,采取相應(yīng)的措施,達到實時監(jiān)測、預(yù)警和記錄的功能。
[Abstract]:The prestressed concrete structure has gradually become the development trend of building structure. In large span prestressed concrete structure, prestressed tendons with parabolic prestressed reinforced beam arrangement, in order to give full play to its role in the four section of parabola Fabregas ribs, however by this method in the construction is very complex, the bellows must also comply with paragraph four parabola in the form of binding, leading to the method in practical engineering application is not widely used. In addition, due to the loss of prestressed structure will directly affect the establishment of prestressed steel beams, will also affect the performance of the prestressed structure, coupled with the structure in the long-term effect of the permanent load and variable load easily damaged and the corresponding bearing capacity and stiffness as time increases. This will not only affect the normal use of the building, will shorten the service life of buildings, Affect the safety of the building. Therefore, it is necessary for large public buildings were monitored during construction and service monitoring, to assess the health status of the building, and make the corresponding decision of project, and early warning of the structure, alarm and maintenance, repair and reinforcement. In this paper, Fuxin City Planning Exhibition hall, a museum display Museum and public activity center (referred to as the "two one") as the background, the museum exhibition hall of partially prestressed structure monitoring and research, mainly includes the following contents: (1) analysis on prestress loss of prestressed concrete structure during construction and service period in theory, focusing on analysis of the prestress losses due to post tensioned construction when, and for the "two one" in the loss of post tensioned bonded prestressed concrete beams were calculated. (2) in the construction stage, the "two one". In the process of the main girder of four parabolas reinforced were invertedcamber theoretical calculation and field measurement, to test the tension construction quality. And by using the finite element software ADINA simulation of the anti arch degree of numerical simulated values, the theoretical value and monitoring value comparison, simulation feasibility of prestressed structure is verified by finite element software. (3) in the service stage, numerical study of the prestressed structure, the prestressing loss of different through the simulation analysis of the prestressed concrete beam, the beam deflection analysis of loss of self and the influence of deflection of the beam structure of other production, determine the beam in service roles, as the criterion of service during the period of monitoring. (4) sensor buried in the anchor through the pre, real-time acquisition of the prestressed beam stress under anchor, through the data collecting system of unified data collection to the collection of storage equipment, according to the number of As the result of the value simulation, when the stress changes under the anchor of each beam, the corresponding measures are taken to achieve the function of real-time monitoring, early warning and recording.

【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU757

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