發(fā)布時(shí)間：2018-03-05 14:31

  本文選題：軟鋼消能器　切入點(diǎn)：兩階段工作　出處：《東南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：軟鋼消能器作為被動(dòng)減震領(lǐng)域的一種耗能裝置,因其滯回性能良好、安裝更換方便等優(yōu)點(diǎn),被廣泛地應(yīng)用到建筑結(jié)構(gòu)減震設(shè)計(jì)中。近年來,國內(nèi)外學(xué)者研究開發(fā)了形式多樣的軟鋼消能器,但是他們大多耗能形式單一,無法同時(shí)兼顧小震和大震作用。本文基于已有的研究成果,將面外彎曲屈服和面內(nèi)剪切屈服兩種不同的耗能機(jī)理有機(jī)的結(jié)合起來,提出一種彎剪組合型軟鋼消能器,以實(shí)現(xiàn)消能器的兩階段屈服耗能目標(biāo)。面外彎曲型軟鋼消能器相對于面內(nèi)剪切型具有更大的屈服位移,基于這一理論基礎(chǔ),通過合理設(shè)計(jì)彎曲板和剪切板的尺寸和用鋼材料,可以實(shí)現(xiàn)耗能裝置的兩階段工作目標(biāo),本文首先對組成耗能裝置的剪切板和彎曲板分別開展了力學(xué)性能理論研究,推導(dǎo)了剪切板與彎曲板核心性能參數(shù)的理論計(jì)算公式�；趩伟迥Ｐ偷睦碚摲治�,通過有限元分析軟件試算確定彎曲板和剪切板的合理尺寸,并對設(shè)計(jì)的彎剪組合型軟鋼消能器建立準(zhǔn)確的邊界條件,進(jìn)行單調(diào)加載和往復(fù)加載數(shù)值模擬分析,研究其應(yīng)力發(fā)展?fàn)顟B(tài),得出彎剪組合型軟鋼消能器的第一屈服位移、第二屈服位移、滯回曲線、骨架曲線等參數(shù),以便設(shè)計(jì)試驗(yàn)構(gòu)件并與試驗(yàn)結(jié)果進(jìn)行對比。針對所設(shè)計(jì)的耗能裝置開展試驗(yàn)研究,首先對Q235鋼材和低屈服點(diǎn)鋼材進(jìn)行了材料性能試驗(yàn),得到了兩種鋼材彈性模量、屈服強(qiáng)度、極限強(qiáng)度、伸長率的等核心參數(shù),確定材料的本構(gòu)關(guān)系。其次,對4個(gè)不同參數(shù)的彎剪組合型軟鋼消能器進(jìn)行了低周往復(fù)加載試驗(yàn),并分析其荷載位移曲線及應(yīng)變發(fā)展趨勢,結(jié)果表明彎剪組合型軟鋼消能器的滯回曲線飽滿,耗能能力穩(wěn)定,與有限元計(jì)算結(jié)果對比發(fā)現(xiàn),兩者在滯回曲線、骨架曲線等方面吻合較好,證明采用有限元軟件對彎剪組合型軟鋼消能器進(jìn)行模擬分析結(jié)果可信,同時(shí)也證明了該型消能器核心性能參數(shù)理論公式的實(shí)際可行性。利用有限元軟件ANSYS對彎剪組合型軟鋼消能器進(jìn)行參數(shù)化分析,分別建立了100個(gè)剪切板和80個(gè)彎曲板單板模型,考察剪切板和彎曲板厚度、寬度及高度對其性能的影響,并確定了各自屈服位移和屈服后剛度的經(jīng)驗(yàn)公式,提出彎剪組合型軟鋼消能器的三折線恢復(fù)力模型,并給出了模型核心參數(shù)的計(jì)算公式。根據(jù)彎剪組合型軟鋼消能器的兩階段工作機(jī)理,提出了其不同于傳統(tǒng)軟鋼消能器的工程設(shè)計(jì)方法,并通過有限元軟件SAP2000和MIDAS Gen對設(shè)置了彎剪組合型軟鋼消能器的減震結(jié)構(gòu)進(jìn)行多遇地震及罕遇地震作用下的動(dòng)力時(shí)程分析。結(jié)果表明,彎剪組合型軟鋼消能器能夠很好的實(shí)現(xiàn)兩階段耗能目標(biāo),有效消耗大震和小震輸入結(jié)構(gòu)的能量。
[Abstract]:As a kind of energy dissipation device in the field of passive shock absorption, mild steel dissipator has been widely used in the design of structural shock absorption in recent years because of its good hysteretic performance and convenient installation and replacement. Domestic and foreign scholars have studied and developed a variety of mild steel energy dissipators, but most of them have a single form of energy dissipation, which can not take into account the action of small earthquakes and large earthquakes at the same time. By combining the two different energy dissipation mechanisms of out-of-plane bending yield and in-plane shear yield, an energy dissipator composed of bending and shearing is proposed. In order to achieve the two-stage yield energy dissipation target of the energy dissipator, the out-of-plane flexural mild steel dissipator has a larger yield displacement than the in-plane shear type. Based on this theoretical basis, the dimensions of the bending plate and the shear plate and the steel material are reasonably designed. The two-stage work goal of energy dissipation device can be realized. In this paper, the mechanical properties of shear plate and bending plate, which constitute the energy dissipation device, are studied respectively. Based on the theoretical analysis of the single plate model, the reasonable dimensions of the bending and shearing plates are determined by the finite element analysis software. The boundary conditions of the designed flexible steel dissipator are established, and the monotone and reciprocating loading numerical simulation analysis are carried out. The stress development state is studied, and the first yield displacement of the bending-shear composite mild steel dissipator is obtained. The second yield displacement, hysteretic curve, skeleton curve and other parameters can be used to design test components and compare with the test results. First, the material properties of Q235 steel and low yield point steel are tested, and the core parameters of elastic modulus, yield strength, ultimate strength and elongation of two kinds of steels are obtained, and the constitutive relation of the material is determined. In this paper, the low cycle reciprocating loading tests of four flexural shear combined type mild steel dissipators are carried out, and the load-displacement curve and strain development trend are analyzed. The results show that the hysteretic curve of the combined bending and shear type mild steel dissipators is full and the energy dissipation capacity is stable. Comparing with the results of finite element calculation, it is found that the hysteretic curves and skeleton curves are in good agreement with each other. It is proved that the simulation results of bending and shear composite type soft steel dissipators with finite element software are credible. At the same time, it is proved that the theoretical formula of core performance parameters of this type of energy dissipation device is feasible. By using the finite element software ANSYS, the parametric analysis of bending and shear composite type soft steel dissipator is carried out, and the 100 shear plates and 80 bending plate veneer models are established, respectively. The effects of the thickness, width and height of shear plate and bending plate on their performance are investigated. The empirical formulas of yield displacement and post-yield stiffness are determined, and the triple-line restoring force model of bending shear combined type mild steel energy dissipator is proposed. The calculation formula of the core parameters of the model is given. According to the two-stage working mechanism of the flexible steel dissipator, the engineering design method, which is different from the traditional soft steel dissipator, is put forward. The dynamic time history of the structure with flexible steel dissipator is analyzed by finite element software SAP2000 and MIDAS Gen under the action of frequent and rare earthquakes. The results show that, The bending-shear combined type mild steel energy dissipator can achieve the two-stage energy dissipation target effectively consuming the energy of the input structure of large earthquake and small earthquake.
【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】：2015
【分類號】：TU352.1

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