本文選題：異形柱　切入點(diǎn)：節(jié)點(diǎn)　出處：《遼寧工程技術(shù)大學(xué)》2013年博士論文　論文類(lèi)型：學(xué)位論文

【摘要】：目前異形柱結(jié)構(gòu)在我國(guó)有著廣泛的應(yīng)用,但異形柱構(gòu)件截面形狀不規(guī)則,縱筋配置也不對(duì)稱,為提高異形柱結(jié)構(gòu)抗震性能,應(yīng)用隔震元件是有效途徑之一；同時(shí),在結(jié)構(gòu)抗震設(shè)計(jì)中地基的處理上仍舊是以剛性假設(shè)為基礎(chǔ),而土層對(duì)地震波的過(guò)濾和放大作用是不能忽視的；因此考慮土-結(jié)構(gòu)相互作用下,研究異形柱框架隔震結(jié)構(gòu)的抗震性能具有一定的研究?jī)r(jià)值和實(shí)際意義。 首先對(duì)12根鋼筋混凝土異形柱進(jìn)行低周往復(fù)荷載作用下抗震性能數(shù)值模擬研究,建立了L形截面、T形截面和十字形截面異形柱并考慮軸壓比,柱肢尺寸,配箍率及截面配筋對(duì)各構(gòu)件抗震性能的影響。結(jié)果表明異形柱破壞過(guò)程中經(jīng)歷的破壞形態(tài)、裂縫出現(xiàn)和延性性能與異形柱構(gòu)件的軸向壓力有很大關(guān)系,軸壓比大的情況下,異形柱構(gòu)件破壞較快,水平變形小,滯回面積較小即耗能能力差,裂縫也較晚出現(xiàn)；當(dāng)軸壓比小時(shí),反而易出現(xiàn)裂縫,但異形柱構(gòu)件變形能力較強(qiáng)延性較好,滯回曲線飽滿即體現(xiàn)了異形柱構(gòu)件延性好,耗能能力強(qiáng),有較好的抗震性能。箍筋用量和截面尺寸的增加可以混凝土提高構(gòu)件的延性。對(duì)3個(gè)鋼筋混凝土異形柱框架節(jié)點(diǎn)進(jìn)行了抗震性能數(shù)值模擬研究,對(duì)節(jié)點(diǎn)的延性、耗能能力、剛度退化等性能進(jìn)行了分析；發(fā)現(xiàn)異形柱構(gòu)件節(jié)點(diǎn)核心區(qū)箍筋在混凝土開(kāi)裂前應(yīng)力變化不大,混凝土開(kāi)裂后失去抗剪能力,箍筋應(yīng)力有很大增加,說(shuō)明箍筋承擔(dān)了大部分剪力,所以有必要在核心區(qū)配置相對(duì)數(shù)量的箍筋以防止節(jié)點(diǎn)核心區(qū)的提前失效。 為提高異形柱框架結(jié)構(gòu)的抗震性能,研究了以鉛芯橡膠支座為主的隔震元件的吸能耗能機(jī)理；鉛芯橡膠支座的阻尼力大、耗能能力強(qiáng),但實(shí)驗(yàn)研究表明,當(dāng)承受較大的水平位移荷載時(shí),鉛芯材料由于其塑性性能很難恢復(fù)原狀,因此考慮在鉛芯橡膠支座的基礎(chǔ)上復(fù)合形狀記憶合金材料(Shape Memory Alloy,簡(jiǎn)稱SMA),根據(jù)實(shí)驗(yàn)研究得出了形狀記憶合的超彈性力學(xué)性能,通過(guò)理論分析證明了形狀記憶合金復(fù)合鉛芯橡膠支座可以增加普通支座的恢復(fù)力,提高了支座的耗能能力,從而保證橡膠支座在發(fā)生較大剪切變形時(shí)仍然能夠恢復(fù)到原位,達(dá)到更好的隔震效果。 最后通過(guò)建立鋼筋混凝土異形柱框架隔震結(jié)構(gòu)模型,研究形狀記憶合金復(fù)合鉛芯橡膠支座對(duì)結(jié)構(gòu)抗震性能的影響,重點(diǎn)考察了考慮土—結(jié)構(gòu)相互作用該支座的減震性能；通過(guò)分析建筑物層間的位移、加速度、速度時(shí)程曲線,對(duì)比分析建筑物的最大相對(duì)位移和最大絕對(duì)位移發(fā)現(xiàn)：地震波的高頻部分被隔震支座和地基土過(guò)濾掉,特別是作為地震波傳播媒介的地基土,其高頻濾波效應(yīng)不容忽視。同時(shí)也說(shuō)明了在剛性地基條件下對(duì)異形柱框架結(jié)構(gòu)地震響應(yīng)分析,與考慮土—結(jié)構(gòu)相互作用的異形柱框架結(jié)構(gòu)的地震響應(yīng)是有所差別的：地基土的存在增加了結(jié)構(gòu)的絕對(duì)位移,用剛性地基條件假設(shè)條件而不考慮土—結(jié)構(gòu)相互作用的的影響而進(jìn)行異形柱框架結(jié)構(gòu)的抗震設(shè)計(jì)是偏于安全和保守的。
[Abstract]:At present, the special-shaped column structure is widely used in our country, but the section shape of the special-shaped column is irregular, longitudinal reinforcement configuration is asymmetric, in order to improve the seismic behavior of special-shaped column structure, the application of isolation is one of the effective ways; at the same time, the foundation treatment in the seismic design of structures is still in rigid assumptions and filtering the layer of seismic wave and the amplification can't be ignored; therefore, considering the soil structure interaction, it has certain research value and practical significance to study on the seismic behavior of special-shaped column frame isolated structure.
The first of 12 reinforced concrete columns were simulated and Numerical Study on seismic performance under low cyclic loading, L section was established, and the T shaped cross-section columns and axial compression ratio, limb length, stirrup ratio and reinforcement on the seismic performance of the components. The results show that the influence of through the failure process failure form of special-shaped column, has a lot of axial pressure cracks and the ductility of the special-shaped columns and the axial compression ratio is large, the special-shaped column damage level fast, small deformation, hysteretic energy dissipation capacity is smaller, the cracks also appeared later; but when the axial compression ratio of hours. Easy to crack, but the special-shaped column deformation capacity ductility, hysteretic curve is full that embodies the special-shaped columns have good ductility, energy dissipation capacity, has better seismic performance. Increasing the amount of stirrup and section size can coagulation The soil increasing ductility. On 3 reinforced concrete special-shaped column frame joints are analyzed by numerical simulation of seismic performance, ductility, energy dissipation capacity of joints, stiffness degradation performance was analyzed; found that the special-shaped columns node stirrups in concrete cracking stress changes little after concrete cracking lost shear capacity, stirrup stress has greatly increased, indicating the stirrups bears most of the shear, so it is necessary to configure in the core area of the relative number of stirrups to prevent the core region of node failure in advance.
In order to improve the seismic performance of special-shaped column frame structure, studied the isolation element to lead rubber bearing mainly absorbing energy dissipation mechanism; the damping force of the lead rubber bearing, high energy consumption, but the experimental study showed that when subjected to horizontal displacement of large load, the lead core material due to its hard plastic properties restitution, so consider on the basis of the lead rubber bearing on the composite shape memory alloy (Shape Memory Alloy, referred to as SMA), according to the experimental study on mechanical properties of superelastic shape memory alloy obtained by theoretical analysis proves that the shape memory alloy composite lead rubber bearing can increase ordinary bearing restoring force, improve the bearing capacity of energy dissipation, so as to ensure that the rubber bearing in large shear deformation can still be restored to the original position, to achieve a better isolation effect.
Finally, through the establishment of model of reinforced concrete special-shaped column frame structure of shape memory alloy composite lead rubber bearing on seismic performance, focusing on the bearing damping performance of soil structure interaction; through the analysis of building inter layer displacement, acceleration, velocity time curve, the maximum relative displacement analysis the building and the absolute maximum displacement that high-frequency seismic wave is filtered out of isolation bearing and foundation soil, especially as the foundation of seismic wave propagation media, the high frequency filtering effect can not be ignored. At the same time also shows that under the condition of rigid foundation on seismic response analysis of special-shaped column frame structure, special-shaped column frame with consideration the structure of soil structure interaction on the seismic response is different: the foundation soil has increased the absolute displacement of the structure, with a rigid foundation Assumptions without considering the influence of soil structure interaction and seismic design of frame structure with special-shaped columns is safe and conservative.

【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TU375.4;TU352.12

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