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  本文關(guān)鍵詞： 自定心 混凝土框架 長期性能 地震易損性 時變特征　出處：《東南大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：裝配式鋼筋混凝土框架結(jié)構(gòu)具有生產(chǎn)速度快,現(xiàn)場施工簡便、構(gòu)件加工精度高、節(jié)約模板等優(yōu)點,已得到廣泛的重視和一定的應(yīng)用。然而,傳統(tǒng)裝配式結(jié)構(gòu)的節(jié)點連接可靠性較差,且會在震后出現(xiàn)較大的殘余變形,給震后修復(fù)帶來困難,因而在抗震設(shè)防區(qū)的使用受到限制。鑒于此,課題組此前提出了一種“腹板摩擦式自定心預(yù)應(yīng)力混凝土框架”(以下簡稱自定心框架),以實現(xiàn)結(jié)構(gòu)在震后的自動復(fù)位以及明確、可控的耗能；然而,現(xiàn)有研究尚未涉及自定心框架結(jié)構(gòu)的長期性能,對于梁柱混凝土的徐變收縮、預(yù)應(yīng)力損失及其對框架抗震性能的影響尚不明確。因此,本文圍繞框架的有限元模擬、長期性能試驗、抗震能力的時變特性等方面,進(jìn)行了較系統(tǒng)的研究,主要研究工作及成果如下：(1)介紹了自定心混凝土框架節(jié)點的構(gòu)造形式和主要力學(xué)性能特點。基于有限元分析軟件DIANA,對自定心框架短期力學(xué)性能的數(shù)值模擬方法進(jìn)行了研究,并利用柱底固結(jié)的自定心框架和混凝土現(xiàn)澆框架的低周反復(fù)加載試驗結(jié)果,與數(shù)值模擬結(jié)果進(jìn)行了對比,兩者吻合較好,為自定心框架短期力學(xué)行為的模擬提供了可靠的工具。(2)自定心框架的長期性能試驗及數(shù)值模擬研究。針對一榀單層單跨自定心框架,進(jìn)行了超過一年的測試,測試內(nèi)容包括框架各測點的位移、預(yù)應(yīng)力損失�；跍y試數(shù)據(jù),對自定心框架的混凝土收縮徐變以及預(yù)應(yīng)力損失情況進(jìn)行了分析。在自定心框架短期行為數(shù)值模型的基礎(chǔ)上,嵌入基于CEB-FIP90的混凝土收縮、徐變模型以及鋼筋應(yīng)力松弛模型,并考慮了配筋率等參數(shù)的影響,以描述自定心框架力學(xué)性能的長期變化。通過數(shù)值模擬結(jié)果與試驗數(shù)據(jù)的對比,驗證了所提出的數(shù)值模擬方法的可行性。(3)自定心框架地震易損性的時變特征研究。按堅硬土壤場地類型,選取20條遠(yuǎn)場地震記錄,并進(jìn)行IDA分析。以層間位移角和殘余變形為指標(biāo),考察了結(jié)構(gòu)在三種性能水準(zhǔn)(IO、LS、CP)下的地震易損性及自定心能力。在此基礎(chǔ)上,在不同時間點上分別進(jìn)行IDA分析,研究了結(jié)構(gòu)地震易損性隨時間的變化特點。上述研究為自定心混凝土框架的長期性能和地震易損性研究提供了參考。
[Abstract]:The fabricated reinforced concrete frame structure has many advantages, such as high production speed, simple construction, high precision of component processing and saving formwork, etc., which has been widely paid attention to and applied to a certain extent. The joint connection reliability of traditional assembly structure is poor, and the residual deformation will appear after the earthquake, which brings difficulties to repair after the earthquake, so the use in the seismic fortification area is restricted. A kind of "web friction self-centring prestressed concrete frame" (hereinafter referred to as self-centering frame) has been put forward by the research group to realize the automatic reset of the structure after the earthquake and the explicit and controllable energy consumption. However, the existing research has not yet covered the long-term performance of self-centered frame structure, for Liang Zhu concrete creep shrinkage, prestressed loss and its impact on the seismic performance of the frame is not clear. This paper focuses on the finite element simulation of the frame, long-term performance tests, seismic capacity of time-varying characteristics, and so on, carried out a more systematic study. The main research work and results are as follows: 1) the structural form and main mechanical properties of self-centered concrete frame joints are introduced. Based on the finite element analysis software DIANA. The numerical simulation method for the short-term mechanical properties of self-centered frame is studied, and the results of low-cycle repeated loading test of self-centered frame and cast-in-place concrete frame are used. Compared with the numerical simulation results, the results agree well with each other. This paper provides a reliable tool for the simulation of short-term mechanical behavior of self-centring frame. The long-term performance test and numerical simulation of self-centering frame are studied. For a single-story single-span self-centering frame. After more than one year of testing, the contents of the test include the displacement of each measuring point of the frame, the loss of prestress, based on the test data. The shrinkage and creep of concrete and the loss of prestress of self-centered frame are analyzed. Based on the numerical model of short-term behavior of self-centered frame, concrete shrinkage based on CEB-FIP90 is embedded. Creep model and stress relaxation model of steel bar are taken into account in order to describe the long-term variation of mechanical properties of self-centered frame. The numerical simulation results are compared with the experimental data. The feasibility of the proposed numerical simulation method is verified. 3) the time-varying characteristics of seismic vulnerability of self-centered frame are studied. According to the site type of hard soil, 20 far-field seismic records are selected. The seismic vulnerability and self-centring ability of the structure under three kinds of performance leveling are investigated by using the interstory displacement angle and residual deformation as the indexes of IDA. On the basis of this, the seismic vulnerability and self-centering ability of the structure are investigated. The characteristics of structural seismic vulnerability with time are studied by IDA analysis at different time points, which provides a reference for the study of long-term performance and seismic vulnerability of self-centered concrete frame.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TU378.4

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