發(fā)布時(shí)間：2018-01-16 21:39

  本文關(guān)鍵詞：HPFL加固震損框架節(jié)點(diǎn)抗震性能研究　出處：《湖南工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： HPFL加固 震損框架節(jié)點(diǎn) 抗震性能 有限元分析 理論分析

【摘要】：高性能水泥復(fù)合砂漿鋼筋網(wǎng)薄層(High Performance Ferrocement Laminate,簡(jiǎn)稱HPFL)加固法以其加固效果顯著、易施工、造價(jià)低廉、防火和耐高溫、耐久和抗老化、與原構(gòu)件混凝土相容性和協(xié)調(diào)性好、不明顯增大構(gòu)件截面、環(huán)保性能好等綜合特征,目前已取得了較系統(tǒng)的研究成果,但用該方法加固框架節(jié)點(diǎn)的研究尚未起步。本文設(shè)計(jì)了5個(gè)縮尺比例為1:2的混凝土框架節(jié)點(diǎn)試驗(yàn)?zāi)Ｐ?在相同的軸壓比下施加水平低周反復(fù)荷載,研究不同震損程度的框架節(jié)加固后的抗震性能。對(duì)于試驗(yàn)中的5個(gè)試件,其中試件J0為對(duì)比試件,不預(yù)損直接加載至破壞;試件JR1不預(yù)損且不卸軸力情況下直接用HPFL加固,然后進(jìn)行水平加載試驗(yàn);試件JR2、JR3、JR4先在相同軸壓比下施加水平低周反復(fù)荷載進(jìn)行不同程度的預(yù)損,同樣在不卸軸力情況下采用HPFL并以選取的最佳加固方式進(jìn)行加固。通過試驗(yàn)研究、數(shù)值模擬分析和節(jié)點(diǎn)受剪承載力公式推導(dǎo)分析框架節(jié)點(diǎn)的受力性能、承載力狀況、延性性能、剛度退化和耗能能力,得到的主要研究結(jié)論為:1、通過對(duì)有震損框架節(jié)點(diǎn)加固后的擬靜力試驗(yàn)研究,發(fā)現(xiàn)不同震損程度的加固節(jié)點(diǎn)的承載力、抗裂性、剛度、延性和耗能能力等都有了大幅度的恢復(fù),甚至超越了原試件。根據(jù)承載力、延性、耗能能力及破壞形態(tài)等性能,本文對(duì)各試件從開始受力到最終破壞的全過程進(jìn)行了仔細(xì)觀測(cè),深入分析了試驗(yàn)中各種現(xiàn)象產(chǎn)生的原因。2、通過比較不同震損程度試件的加固效果發(fā)現(xiàn),試件的震損程度越大,其極限荷載和極限位移提高的程度越小,結(jié)構(gòu)延性系數(shù)提高程度逐漸降低。加固后試件的滯回環(huán)更加的飽滿,試件的耗能能力也有一定的提高。試件的預(yù)損程度越小剛度退化越快。試件屈服以后,各試件剛度退化都趨于平緩,剛度退化趨于一致。加固后的混凝土框架節(jié)點(diǎn)要比未加固的框架節(jié)點(diǎn)的承載力和塑性變形能力更加的穩(wěn)定,承載力也比未加固框架節(jié)點(diǎn)的承載力退化的緩慢。3、通過ANSYS有限元分析軟件對(duì)加固前后的框架節(jié)點(diǎn)試件模型進(jìn)行模擬對(duì)比,發(fā)現(xiàn)模擬結(jié)果和試驗(yàn)結(jié)果符合程度較高,在一定程度上驗(yàn)證了試驗(yàn)結(jié)果和模擬結(jié)果的可靠性。4、通過試驗(yàn)研究和對(duì)試件的加固施工過程,提出了采用HPFL的加固方法,并且總結(jié)出了采用HPFL加固RC框架節(jié)點(diǎn)的施工工藝流程,可以為后續(xù)的工程技術(shù)人員提供一定的參考。5、在充分分析了節(jié)點(diǎn)核心區(qū)的抗剪機(jī)理后,推導(dǎo)出了HPFL加固框架節(jié)點(diǎn)的抗剪承載力公式,將公式計(jì)算結(jié)果和試驗(yàn)結(jié)果進(jìn)行比較,驗(yàn)證了公式的合理性,通過公式和試件的受力狀態(tài)分析了節(jié)點(diǎn)核心區(qū)承載力的影響因素,可方便后續(xù)人員作為參考。
[Abstract]:High Performance Ferrocement Laminate. HPFL) reinforcement method has remarkable effect, easy construction, low cost, fire and high temperature resistance, durability and aging resistance, good compatibility and coordination with the original member concrete, and does not obviously increase the section of the member. At present, more systematic research results have been obtained because of the good environmental performance and other comprehensive characteristics. However, the study of strengthening frame joints with this method has not yet started. In this paper, five concrete frame joints with a scale of 1: 2 are designed and applied under the same axial compression ratio. The seismic behavior of frame joints strengthened with different earthquake damage degree is studied. For the 5 specimens in the test, the specimen J0 is a contrast specimen, without predamage loading directly to the failure. The JR1 of the specimen is strengthened with HPFL without predamage and axial force, and then the horizontal loading test is carried out. The specimen JR2 + JR3 + JR4 was subjected to horizontal low cycle repeated load under the same axial compression ratio to carry out different degrees of predamage. At the same time, HPFL is adopted in the case of no unloading axial force and the optimum reinforcement method is chosen. Through experimental research, numerical simulation analysis and shear bearing capacity formula of joints, the mechanical behavior of frame joints is deduced and analyzed. Bearing capacity, ductility, stiffness degradation and energy dissipation capacity, the main conclusion is: 1, through the seismic damage of the frame joints after the quasi-static test. It is found that the bearing capacity, crack resistance, stiffness, ductility and energy dissipation capacity of the strengthened joints with different earthquake damage degree have been greatly restored, even beyond the original specimen. According to the bearing capacity, ductility. In this paper, the whole process from the beginning to the final failure of the specimen is observed carefully, and the causes of various phenomena in the test are analyzed. 2. By comparing the strengthening effect of the specimens with different earthquake damage degrees, it is found that the greater the earthquake damage degree of the specimen is, the smaller the increase of ultimate load and ultimate displacement is. The ductility coefficient of the structure decreases gradually. The hysteretic loop of the strengthened specimen is more full, and the energy dissipation capacity of the specimen is also improved. The smaller the predamage degree of the specimen is, the faster the stiffness degenerates. The stiffness degradation of each specimen tends to be gentle and the stiffness degradation tends to be consistent. The reinforced concrete frame joints are more stable than the unreinforced joints in carrying capacity and plastic deformation. The bearing capacity is also slower than that of the unreinforced frame joints. The model of the frame joints before and after reinforcement is simulated and compared by ANSYS finite element analysis software. It is found that the simulation results are in good agreement with the test results, and the reliability of the test results and simulation results is verified to a certain extent. The reinforcement method of HPFL is put forward, and the construction process of RC frame joint strengthened by HPFL is summarized, which can provide a certain reference for the subsequent engineers and technicians. After fully analyzing the shear mechanism of the core zone of the joints, the shear bearing capacity formula of HPFL reinforced frame joints is derived, and the calculation results are compared with the experimental results, and the rationality of the formula is verified. The factors influencing the bearing capacity of the core zone of the joint are analyzed by the formula and the stress state of the specimen, which can be used as a reference for the follower.
【學(xué)位授予單位】：湖南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU375.4;TU352.11

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