【摘要】：輕骨料混凝土具有強(qiáng)重比高、耐火性能好等特點(diǎn),是一種發(fā)展前景良好的綠色建筑材料。使用高強(qiáng)輕骨料混凝土可以減輕建筑物自重,減小地震反應(yīng),但也存在脆性顯著,在往復(fù)荷載作用下易發(fā)生脆性破壞�？蚣芄�(jié)點(diǎn)作為梁和柱傳力樞紐,是框架結(jié)構(gòu)的關(guān)鍵部件和抗震的薄弱環(huán)節(jié)。因此,研究高強(qiáng)輕骨料混凝土框架節(jié)點(diǎn)的抗震性能是必不可少的。本文基于試驗(yàn)研究,采用理論分析和數(shù)值模擬相結(jié)合的方法,對(duì)高強(qiáng)輕骨料混凝土框架中節(jié)點(diǎn)的受剪性能進(jìn)行了研究,主要包括以下內(nèi)容:(1)基于4個(gè)高強(qiáng)輕骨料混凝土框架節(jié)點(diǎn)往復(fù)加載試驗(yàn),研究了高強(qiáng)輕骨料混凝土框架中節(jié)點(diǎn)的受剪性能。并基于我國(guó)規(guī)范(JGJ12-2006)、美國(guó)規(guī)范(ACI318-14、ACI352R-02)和歐洲規(guī)范(EC2),計(jì)算了中節(jié)點(diǎn)試件的抗剪強(qiáng)度。研究表明基于美國(guó)規(guī)范和歐洲規(guī)范的受剪承載力計(jì)算值與試驗(yàn)值較為接近,而基于我國(guó)規(guī)范的計(jì)算結(jié)果相對(duì)保守。(2)基于MCFT理論,建立高強(qiáng)輕骨料混凝土框架節(jié)點(diǎn)抗剪分析模型,并結(jié)合Attaalla抗剪模型和簡(jiǎn)化Attaalla抗剪模型,對(duì)本文和收集到的國(guó)內(nèi)外共17組輕骨料混凝土框架節(jié)點(diǎn)試驗(yàn)試件進(jìn)行受剪分析,與試驗(yàn)結(jié)果對(duì)比發(fā)現(xiàn)基于以上模型預(yù)測(cè)的節(jié)點(diǎn)試件抗剪強(qiáng)度值與試驗(yàn)值均吻合良好,MCFT模型可以較好地預(yù)測(cè)試件達(dá)到峰值應(yīng)力前的受力行為,Attaalla模型考慮了混凝土的“受壓軟化”效應(yīng)。(3)基于有限元分析軟件Abaqus完成了該類節(jié)點(diǎn)的有限元模擬。模擬得到的節(jié)點(diǎn)破壞過程和核心區(qū)剪應(yīng)力結(jié)果與試驗(yàn)結(jié)果相吻合,滯回曲線無明顯捏縮現(xiàn)象。在此基礎(chǔ)上,研究了節(jié)點(diǎn)核心區(qū)配箍率和軸壓比對(duì)該類節(jié)點(diǎn)抗剪性能的影響規(guī)律,研究表明,這兩大因素對(duì)高強(qiáng)輕骨料混凝土框架節(jié)點(diǎn)的影響規(guī)律與普通混凝土框架節(jié)點(diǎn)相類似。本文相關(guān)工作對(duì)了解輕骨料混凝土框架節(jié)點(diǎn)的破壞機(jī)理,保障地震區(qū)輕骨料混凝土框架的安全具有重要的理論意義和實(shí)用價(jià)值,促進(jìn)了高強(qiáng)輕骨料混凝土這種綠色環(huán)保材料在框架結(jié)構(gòu)中的推廣應(yīng)用。
[Abstract]:Lightweight aggregate concrete is a kind of green building material with good development prospect because of its high ratio of strong weight to weight and good fire resistance. The use of high strength lightweight aggregate concrete can reduce the weight of the building and reduce the seismic response, but there is also brittleness, which is prone to brittle failure under reciprocating load. The frame joint is the key component of the frame structure and the weak link of earthquake resistance as the load transfer hub of beam and column. Therefore, it is necessary to study the seismic behavior of high strength lightweight aggregate concrete frame joints. Based on experimental research, the shear behavior of joints in high strength lightweight aggregate concrete frame is studied by combining theoretical analysis and numerical simulation. The main contents are as follows: (1) based on the reciprocating loading tests of four high strength lightweight aggregate concrete frame joints, the shear behavior of the joints in the high strength lightweight aggregate concrete frame is studied. Based on JGJ12-2006, ACI318-14,ACI352R-02 and EC2, the shear strength of the specimens is calculated. The results show that the calculated value of shear capacity based on American Code and European Code is close to the test value, while the calculated results based on Chinese Code are relatively conservative. (2) based on MCFT theory, The shear analysis model of high strength lightweight aggregate concrete frame joints is established. Combined with Attaalla shear model and simplified Attaalla shear model, 17 groups of test specimens of lightweight aggregate concrete frame joints collected in this paper and at home and abroad are analyzed. Compared with the experimental results, it is found that the shear strength values of the joint specimens predicted by the above model are in good agreement with the test values, and the MCFT model can better predict the behavior of the specimens before the peak stress is reached. The Attaalla model takes into account the "compressive softening" effect of concrete. (3) the finite element simulation of this kind of joints is completed based on the finite element analysis software Abaqus. The simulated results of joint failure process and core shear stress are in agreement with the experimental results, and there is no obvious pinch phenomenon in hysteretic curves. On the basis of this, the influence of hoop ratio and axial compression ratio on the shear performance of the joints is studied, and the results show that, The influence of these two factors on high strength lightweight aggregate concrete frame joints is similar to that of ordinary concrete frame joints. The relevant work in this paper is of great theoretical significance and practical value in understanding the failure mechanism of lightweight aggregate concrete frame joints and ensuring the safety of light aggregate concrete frame in earthquake area. It promotes the application of high strength lightweight aggregate concrete, a green environmental protection material, in frame structure.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU375.4

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