本文選題：再生混凝土磚　切入點(diǎn)：酸雨　出處：《西安建筑科技大學(xué)》2015年碩士論文

【摘要】：砌體結(jié)構(gòu)是一種具有悠久歷史的建筑結(jié)構(gòu)形式,其在我國(guó)乃至世界各地均具有非常廣泛的應(yīng)用。改革開放以來,隨著我國(guó)經(jīng)濟(jì)的迅速發(fā)展,環(huán)境的污染不可避免的造成了酸雨問題,而酸雨對(duì)建筑物造成的傷害已成為我國(guó)建筑物過早退役的罪魁禍?zhǔn)字�。隨著酸雨對(duì)砌體結(jié)構(gòu)腐蝕程度的加深,結(jié)構(gòu)的整體承載力會(huì)下降,使用功能降低,這嚴(yán)重影響了其耐久性,砌體結(jié)構(gòu)在酸雨環(huán)境作用下的性能退化研究勢(shì)在必行。本文設(shè)計(jì)制作了8榀再生混凝土組合墻片,采用人工模擬酸雨腐蝕試驗(yàn)對(duì)墻片進(jìn)行了不同程度的腐蝕。隨后通過墻片的低周反復(fù)加載試驗(yàn)研究了再生混凝土磚組合墻抗震性能隨酸雨腐蝕循環(huán)次數(shù)增加的退化規(guī)律。試驗(yàn)結(jié)果對(duì)比分析表明,隨著試件受酸雨腐蝕程度的增加,試件的開裂荷載、極限荷載整體上呈現(xiàn)下降的趨勢(shì),而開裂位移、極限位移大致上呈增長(zhǎng)的趨勢(shì),其初始剛度逐漸減小,試件的延性變差,耗能能力變?nèi)�。隨后,簡(jiǎn)要分析酸性大氣環(huán)境下墻體性能退化原理,由細(xì)觀角度上來講,墻體性能退化的原因?yàn)殡S著酸雨腐蝕,砂漿及磚的密實(shí)度持續(xù)加強(qiáng)直至達(dá)到飽和狀態(tài)發(fā)生膨脹破壞,從而產(chǎn)生微裂縫降低砂漿與磚的強(qiáng)度;由宏觀角度上來講,酸雨腐蝕使得砂漿與磚的膠結(jié)面更容易產(chǎn)生微裂縫,甚至產(chǎn)生粘結(jié)面局部脫離,使得其抗剪強(qiáng)度的下降。在試驗(yàn)的基礎(chǔ)上對(duì)帶構(gòu)造柱墻體極限荷載計(jì)算公式進(jìn)行了修正并結(jié)合本文及國(guó)內(nèi)諸多文獻(xiàn)的試驗(yàn)值進(jìn)行了對(duì)比分析,結(jié)果表明本文修正理論計(jì)算公式具有很好的精確性。隨后,介紹了陸新征-曲哲恢復(fù)力模型及其關(guān)于砌體結(jié)構(gòu)各參數(shù)的標(biāo)定,針對(duì)個(gè)別參數(shù)進(jìn)行了修正。接著,基于損傷理論建立了砌體結(jié)構(gòu)損傷恢復(fù)力模型,并基于損傷恢復(fù)力模型在有限元軟件MARC中利用三彈簧單元模型進(jìn)行了有限元模擬�；趽p傷的陸新征-曲哲模型可以很好的考慮砌體結(jié)構(gòu)材料退化特性,同時(shí)也證明了三彈簧單元模擬砌體構(gòu)件的滯回性能有很好的準(zhǔn)確度。最后,本文選取了典型的在役砌體結(jié)構(gòu)建筑并在有限元軟件中進(jìn)行了結(jié)構(gòu)建模,對(duì)有限元模型中的不同的墻片進(jìn)行了分類,并針對(duì)所有墻片代入基于損傷理論的陸新征-曲哲恢復(fù)力模型。隨后,根據(jù)地震波選波原則選取12條地震波并對(duì)結(jié)構(gòu)進(jìn)行了IDA分析,最終建立了結(jié)構(gòu)不同損傷程度的地震易損性曲線。易損性分析結(jié)果表明,隨著結(jié)構(gòu)損傷程度的增加,結(jié)構(gòu)在各極限破壞狀態(tài)對(duì)應(yīng)的超越概率增大。計(jì)算結(jié)果可為既有的砌體結(jié)構(gòu)抗震性能評(píng)估提供理論依據(jù)。
[Abstract]:Masonry structure is a kind of building structure with a long history, which is widely used in our country and all over the world.Since the reform and opening up, with the rapid development of China's economy, the pollution of the environment inevitably caused the acid rain problem, and the damage caused by acid rain to the buildings has become one of the main culprits of premature decommissioning of the buildings in our country.With the deepening of the corrosion degree of the masonry structure by acid rain, the overall bearing capacity of the structure will decrease, and the use function will be reduced, which seriously affects the durability of the masonry structure, so it is imperative to study the performance degradation of the masonry structure under the action of acid rain environment.In this paper, 8 pieces of recycled concrete composite wall were designed and manufactured, and the corrosion of the wall was carried out by artificial simulated acid rain corrosion test.Then the degradation law of seismic behavior of recycled concrete brick composite wall with the increase of acid rain corrosion cycle is studied by low-cycle repeated loading test.The comparative analysis of the test results shows that with the increase of the corrosion degree of the specimen by acid rain, the cracking load and the ultimate load of the specimen show a downward trend, while the cracking displacement and the ultimate displacement generally show an increasing trend.The initial stiffness decreases gradually, the ductility of the specimen becomes worse and the energy dissipation capacity weakens.Then, the principle of wall performance degradation in acidic atmosphere is briefly analyzed. From a meso point of view, the reason of wall performance degradation is that the compactness of mortar and brick continues to strengthen with acid rain corrosion until it reaches saturation state.From the macroscopic point of view, acid rain corrosion makes the cement surface of mortar and brick easier to produce micro-cracks, and even produces local detachment of bond surface, which makes the shear strength of mortar and brick decrease.On the basis of experiment, the formula for calculating ultimate load of wall with structural column is revised and compared with the experimental data of this paper and many domestic literatures. The results show that the modified formula has good accuracy.Then, the Lu Xinzheng-Quzhe restoring force model and its calibration about the parameters of masonry structure are introduced, and some parameters are modified.Then, based on the damage theory, the damage restoring force model of masonry structure is established, and the damage recovery force model is simulated by using the three-spring element model in the finite element software MARC.Luxin-Quzhe model based on damage can take into account the degradation characteristics of masonry structure materials, and it also proves that the three-spring element can simulate the hysteretic behavior of masonry members with good accuracy.Finally, this paper selects the typical in-service masonry structure building and carries on the structure modeling in the finite element software, has carried on the classification to the different wall piece in the finite element model.According to the damage theory, the model of Lu Xinzheng-Quzhe's restoring force is put into all the wall plates.Then, according to the principle of seismic wave selection, 12 seismic waves are selected and analyzed by IDA. Finally, the seismic vulnerability curves of structures with different damage degree are established.The results of vulnerability analysis show that with the increase of the damage degree of the structure, the corresponding transcendental probability of the structure in various ultimate failure states increases.The calculated results can provide theoretical basis for seismic performance evaluation of existing masonry structures.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU364;TU352.11

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