本文選題：鋼筋混凝土柱 + 荷載與環(huán)境��； 參考：《浙江大學(xué)》2015年博士論文

【摘要】：鋼筋混凝土結(jié)構(gòu)均是在荷載和環(huán)境共同作用下工作。柱是結(jié)構(gòu)的豎向承重構(gòu)件,支撐著梁板等上部結(jié)構(gòu),柱子的破壞往往比其它構(gòu)件破壞造成的危害更加嚴(yán)重。氯鹽侵蝕是導(dǎo)致鋼筋混凝土結(jié)構(gòu)服役性能劣化的重要原因之一。本文以柱為研究對(duì)象,圍繞荷載和環(huán)境共同作用下銹蝕鋼筋混凝土柱的力學(xué)性能,進(jìn)行了以下研究工作： (1)為選擇科學(xué)合理的主筋和箍筋同時(shí)銹蝕的加速試驗(yàn)方法,對(duì)相同試件采用不同的接線方式進(jìn)行通電加速銹蝕和承載力試驗(yàn),對(duì)比了不同接線銹蝕方法試件的銹蝕鋼筋質(zhì)量損失、溢銹分布、溢銹顏色、銹脹裂縫分布和發(fā)展規(guī)律,分析了銹蝕鋼筋的表面形態(tài)和銹蝕產(chǎn)物形貌,研究了主筋與箍筋連接和接線方式對(duì)銹蝕試件極限承載力、荷載-位移、破壞特征等宏觀力學(xué)性能的影響。 (2)為量化僅箍筋銹蝕對(duì)混凝土柱承載力的影響,對(duì)采用外加電流法獲得的僅箍筋銹蝕的鋼筋混凝土短柱進(jìn)行軸壓承載力試驗(yàn),分析了箍筋銹脹裂縫的分布規(guī)律,比較了箍筋銹蝕對(duì)柱極限承載力和破壞特征等宏觀力學(xué)性能的影響,建立了考慮箍筋銹蝕引起的保護(hù)層剝落、箍筋對(duì)混凝土約束能力降低、箍筋對(duì)主筋支撐作用降低等因素的箍筋銹蝕軸壓混凝土短柱承載力模型。 (3)為研究荷載和環(huán)境共同作用下鋼筋混凝土柱的力學(xué)性能,提出了荷載和環(huán)境共同作用下鋼筋混凝土柱力學(xué)性能的試驗(yàn)方法,分別采用自平衡和外加電流的方法對(duì)柱施加持續(xù)荷載和對(duì)柱內(nèi)主筋與箍筋進(jìn)行加速銹蝕來(lái)模擬荷載和環(huán)境的共同作用；開發(fā)了由支撐系統(tǒng)、垂直升降系統(tǒng)和水平移動(dòng)系統(tǒng)組成的受壓柱試驗(yàn)的加載定位裝置；通過(guò)對(duì)持載和銹蝕作用下軸心、小偏心和大偏心共30根柱的承載力試驗(yàn),分析了荷載和環(huán)境共同作用對(duì)柱中鋼筋銹蝕的影響及銹脹裂縫的分布規(guī)律,比較了偏心距、持載水平和銹蝕率對(duì)銹蝕鋼筋混凝土柱宏觀力學(xué)性能的影響,研究了荷載和環(huán)境共同作用下銹蝕鋼筋混凝土柱的破壞特征。 (4)基于荷載和環(huán)境共同作用下銹蝕鋼筋混凝土的承載力試驗(yàn),分析了銹蝕鋼筋混凝土柱承載力的影響因素,綜合考慮箍筋銹蝕對(duì)主筋支撐作用降低進(jìn)而對(duì)主筋屈曲承載力的影響、主筋和箍筋銹蝕引起保護(hù)層剝落、自身截面面積減小和強(qiáng)度的改變以及長(zhǎng)期荷載作用的影響,采用變剛度的彈簧模擬箍筋銹蝕區(qū)段內(nèi)箍筋對(duì)主筋的約束,分別建立了銹蝕鋼筋混凝土軸壓柱和偏壓柱的承載力模型。 (5)為研究鋼筋混凝土柱的損傷破壞全過(guò)程,借助液壓加載系統(tǒng)和聲發(fā)射(AE)系統(tǒng)測(cè)試了非銹蝕和銹蝕鋼筋混凝土偏壓柱在荷載作用下的聲發(fā)射參數(shù),對(duì)比分析了非銹蝕和銹蝕柱的聲發(fā)射特征及其時(shí)空演化規(guī)律,基于聲發(fā)射幅值信號(hào)的裕度值評(píng)價(jià)了非銹蝕和銹蝕鋼筋混凝土偏壓柱的損傷狀況,給出了基于聲發(fā)射能量相對(duì)變化參數(shù)表示的損傷因子表達(dá)式。
[Abstract]:Reinforced concrete structures work under the combined action of load and environment.Column is the vertical bearing member of structure, which supports the upper structure such as beam and slab. The damage of column is more serious than that of other members.Chloride erosion is one of the important causes of deterioration of service performance of reinforced concrete structures.In this paper, columns are taken as the research object, and the following research work is carried out around the mechanical properties of corroded reinforced concrete columns under the combined action of load and environment.In order to select scientific and reasonable accelerated corrosion test method of main reinforcement and stirrups at the same time, electric accelerated corrosion and bearing capacity tests are carried out on the same specimens with different connection modes.In this paper, the quality loss, distribution, color, crack distribution and development of corroded steel bars with different wiring corrosion methods are compared, and the surface morphology and morphology of corrosion products of corroded steel bars are analyzed.The effects of connection and connection between main reinforcement and stirrups on the ultimate bearing capacity, load-displacement and failure characteristics of corroded specimens were studied.In order to quantify the effect of stirrups corrosion only on the bearing capacity of concrete columns, the axial bearing capacity tests of reinforced concrete short columns with only stirrups corrosion obtained by external current method are carried out, and the distribution law of stirrups corrosion cracks is analyzed.The effects of stirrups corrosion on the ultimate bearing capacity and failure characteristics of columns are compared. The protection layer spalling caused by stirrups corrosion is established, and the restraint ability of stirrups to concrete is reduced.The bearing capacity model of corroded concrete short columns with stirrups corroded by stirrups and other factors which reduce the effect of stirrups on the support of main tendons.In order to study the mechanical properties of reinforced concrete columns under the combined action of load and environment, a test method for the mechanical properties of reinforced concrete columns under the combined action of load and environment is put forward.In order to simulate the interaction of load and environment, the self-balancing and applied electric current are applied to the column and the main reinforcement and stirrups in the column are corroded to simulate the interaction between the load and the environment, and the bracing system is developed.A loading and positioning device for the compression column test consisting of a vertical lifting system and a horizontal moving system. The bearing capacity of a total of 30 columns with small eccentricity and large eccentricity under the action of holding load and corrosion is tested.The effects of load and environment on the corrosion of steel bars and the distribution of corrosion cracks in columns are analyzed. The effects of eccentricity, load holding level and corrosion rate on the macroscopic mechanical properties of corroded reinforced concrete columns are compared.The failure characteristics of corroded reinforced concrete columns under the combined action of load and environment are studied.4) based on the bearing capacity test of corroded reinforced concrete under the combined action of load and environment, the factors affecting the bearing capacity of corroded reinforced concrete columns are analyzed.Considering the effect of stirrups corrosion on the buckling capacity of the main reinforcement, the corrosion of the main reinforcement and stirrups cause the exfoliation of the protective layer, the decrease of the cross section area and the change of the strength, as well as the effect of the long-term load.The bearing capacity models of corroded reinforced concrete columns under axial compression and eccentric compression are established by using spring with variable stiffness to simulate the constraints of stirrups on the main reinforcement in the corroded section of stirrups.In order to study the whole process of damage and failure of reinforced concrete columns, the acoustic emission parameters of non-corroded and corroded reinforced concrete columns under load are measured by hydraulic loading system and acoustic emission (AE) system.The acoustic emission characteristics of non-rust and corroded columns and their space-time evolution laws are compared and analyzed. The damage status of non-corroded and corroded reinforced concrete columns is evaluated based on the margin of acoustic emission amplitude signals.The expression of damage factor based on the relative variation parameter of acoustic emission energy is given.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU375.3

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本文編號(hào)：1741827