本文選題：鋼筋混凝土長柱 + 鋼筋混凝土短柱��； 參考：《湖南大學(xué)》2014年博士論文

【摘要】：地震和沖擊荷載等強(qiáng)動力荷載作用造成鋼筋混凝土結(jié)構(gòu)破壞,從而導(dǎo)致大量的人員傷亡和巨大的財(cái)產(chǎn)損失。鋼筋混凝土結(jié)構(gòu)在地震和沖擊荷載等強(qiáng)動力荷載作用下存在的應(yīng)變率效應(yīng)使其動力性能與靜態(tài)性能存在較大差異。在沖擊荷載下受復(fù)雜的應(yīng)力波傳播和慣性效應(yīng)的影響,結(jié)構(gòu)行為更加復(fù)雜。在地震作用的應(yīng)變率范圍內(nèi),鋼筋混凝土柱的軸向受壓動力行為及考慮箍筋約束效應(yīng)和應(yīng)變率效應(yīng)的鋼筋混凝土柱的動力行為的試驗(yàn)資料和數(shù)值分析研究十分缺乏。在混凝土結(jié)構(gòu)抗沖擊性能研究方面,少見無腹筋梁和深梁的抗沖擊行為研究的文獻(xiàn),配箍筋鋼筋混凝土梁的在沖擊荷載下的剪切行為的試驗(yàn)研究數(shù)量仍十分有限,對沖擊過程中梁的加速度響應(yīng)及其分布變化未進(jìn)行詳細(xì)探討,影響梁的沖擊響應(yīng)的相關(guān)因素(比如配箍率、剪跨比等)的探討還不夠全面�；诖�,本文采用試驗(yàn)和數(shù)值分析研究相結(jié)合的方法,在地震作用的應(yīng)變率范圍內(nèi)對鋼筋混凝土柱的動力行為以及沖擊荷載下鋼筋混凝土梁和深梁的動力行為進(jìn)行研究。本文的主要研究工作如下： (1)開展了兩種不同長細(xì)比的鋼筋混凝土長柱快速軸心受壓加載試驗(yàn)和動力有限元模擬研究,分析了快速加載對不同長細(xì)比的柱動態(tài)承載力及其對應(yīng)的變形的影響,闡述了不同長細(xì)比的軸心受壓柱動態(tài)承載力提高的機(jī)制,即快速加載下應(yīng)變率效應(yīng)和慣性效應(yīng)在不同長細(xì)比下的影響規(guī)律。 (2)提出了同時(shí)考慮應(yīng)變率效應(yīng)和箍筋約束效應(yīng)的混凝土塑性模型等效單軸受壓本構(gòu)模型,并基于此利用ABAQUS建立了分析約束鋼筋混凝土軸壓短柱在快速加載下動力行為的有限元模型。算例分析表明,模擬結(jié)果與試驗(yàn)結(jié)果吻合良好。通過有限元模型參數(shù)分析,得到了配置箍筋構(gòu)形、箍筋間距和縱筋配筋率對約束鋼筋混凝土短柱在地震作用應(yīng)變率范圍內(nèi)的動態(tài)力學(xué)性能的影響規(guī)律。 (3)開展了簡支無腹筋鋼筋混凝土梁的落錘沖擊試驗(yàn)研究和有限元分析。通過試驗(yàn)研究重點(diǎn)關(guān)注沖擊錘重、沖擊速度和沖擊能量對梁在沖擊荷載下梁的破壞過程、典型破壞模式和剪切破壞面的影響,并研究了沖擊力、鋼筋與混凝土應(yīng)變時(shí)程特點(diǎn)�；趹�(yīng)變數(shù)據(jù),推斷出梁在沖擊過程中的彎矩分布及慣性力分布特點(diǎn),并在此基礎(chǔ)上對單自由度等效模型進(jìn)行了討論。采用LS-DYNA建立了分析無腹筋鋼筋混凝土梁抗沖擊行為的有限元模型,分析了剪跨比、梁頂是否配置縱筋對無腹筋梁的沖擊響應(yīng)的影響規(guī)律。 (4)開展了簡支配箍鋼筋混凝土梁的落錘沖擊試驗(yàn)和有限元模擬。試驗(yàn)研究了不同沖擊速度、沖擊能量及二次沖擊效應(yīng)對沖擊荷載下的梁抗剪行為的影響,得到了不同參數(shù)影響下梁的破壞過程、破壞模式特點(diǎn),詳細(xì)分析了沖擊響應(yīng)(包括沖擊力、支座反力和位移時(shí)程曲線以及沖擊力-位移曲線和支座反力-位移曲線)的特征。基于實(shí)測加速度響應(yīng),分析了沖擊過程中梁的慣性力分布特點(diǎn),進(jìn)而討論了不同沖擊荷載作用下梁斜裂縫開裂模式差異的機(jī)理和梁的抗沖擊承載力評估方法。采用LS-DYNA建立了分析沖擊荷載作用下配箍鋼筋混凝土梁動力行為的有限元模型,并分析了配箍率對鋼筋混凝土梁的沖擊響應(yīng)的影響規(guī)律。 (5)首次開展了簡支鋼筋混凝土深梁的落錘沖擊試驗(yàn)研究和有限元分析。通過試驗(yàn)研究了兩種靜載破壞特性的鋼筋混凝土深梁在不同沖擊速度及二次沖擊效應(yīng)下的動態(tài)行為,針對破壞過程和破壞形態(tài)、沖擊力、跨中位移響應(yīng)的特點(diǎn)進(jìn)行了分析,并討論了深梁的抗沖擊承載力的評估方法。采用LS-DYNA建立了分析深梁抗沖擊行為的有限元模型,并用試驗(yàn)數(shù)據(jù)進(jìn)行了驗(yàn)證,進(jìn)而研究了配箍率對鋼筋混凝土深梁在沖擊荷載下的動態(tài)響應(yīng)的影響規(guī)律。
[Abstract]:Strong dynamic loads, such as earthquakes and impact loads, cause damage to reinforced concrete structures, resulting in a large number of casualties and huge property losses. The effect of strain rate on the dynamic performance and static performance of reinforced concrete structures under strong dynamic loads, such as earthquake and impact loads, makes a great difference between the dynamic performance and the static performance. Under the influence of complex stress wave propagation and inertia effect, the structural behavior is more complex. In the range of strain rate, the axial compression dynamic behavior of reinforced concrete columns and the experimental data and numerical analysis of the dynamic behavior of reinforced concrete columns considering the confinement effect and strain rate effect of the stirrup and strain rate are very short. In the study of the impact resistance of concrete structures, the study of impact resistance behavior of non abdominal tendons and deep beams is rare. The number of shear behavior of reinforced concrete beams with stirrup reinforced concrete beams under impact loads is still very limited. The acceleration response and distribution of beams in the process of impact are not discussed in detail, affecting the impact of the beams. In this paper, the dynamic behavior of reinforced concrete columns and the dynamic behavior of steel reinforced concrete beams and deep beams under the impact load are studied in this paper. The main research work of this article is as follows:
(1) two kinds of reinforced concrete long columns with different length and slenderness ratio are carried out by fast axial compression loading test and dynamic finite element simulation. The effect of fast loading on the dynamic bearing capacity of columns with different length and slenderness ratio and its corresponding deformation is analyzed. The mechanism of improving the dynamic bearing capacity of the axial compression column with different length and fineness ratio is described, that is, fast loading The influence of different slenderness ratio on the strain rate effect and inertial effect under different slenderness ratios.
(2) an equivalent uniaxial compression constitutive model of concrete plastic model is proposed, which considers both the strain rate effect and the confinement effect of the stirrup. Based on this, a finite element model for the dynamic behavior of a confined reinforced concrete axial compression short column under rapid loading is established by using ABAQUS. The numerical example shows that the simulation results are in good agreement with the experimental results. Through the analysis of the parameters of the finite element model, the influence of the configuration of the stirrup, the spacing of the stirrup and the reinforcement ratio of the longitudinal reinforcement on the dynamic mechanical properties of the confined reinforced concrete short columns in the range of the earthquake action strain rate is obtained.
(3) the drop hammer impact test and finite element analysis of a simple supported reinforced concrete beam with no abdominal tendon are carried out. The damage process of the beam under impact load, the impact of the typical failure mode and the shear failure surface on the beam under impact load, and the impact force, the strain of the reinforced concrete and the concrete are studied. Based on the strain data, the bending moment distribution and the characteristics of the inertia force distribution of the beam in the process of impact are deduced. On the basis of this, the equivalent model of single degree of freedom is discussed. The finite element model for the analysis of the anti impact behavior of the reinforced concrete beams with no abdominal tendons is established by LS-DYNA. The influence of the impact response of the girders of the abdominal tendons.
(4) the impact test and finite element simulation of reinforced concrete beams with simply dominated stirrup are carried out. The effects of different impact velocity, impact energy and two impact effects on the shear behavior of beams under impact load are studied, and the failure process of the beams under the influence of different parameters and the characteristics of the failure mode are obtained. The impact response is analyzed in detail. The characteristics of the impact force, the support reaction and displacement time history curve, the impact force displacement curve and the support reverse force displacement curve. Based on the measured acceleration response, the characteristics of the beam's inertia force distribution in the impact process are analyzed, and the mechanism of the split mode difference and the impact bearing capacity of the beam under different impact loads are discussed. The finite element model of the dynamic behavior of stirrup reinforced concrete beams under impact loading is established by LS-DYNA, and the influence of the stirrup rate on the impact response of reinforced concrete beams is analyzed.
(5) the impact test study and finite element analysis of the simple supported reinforced concrete deep beam are first carried out. The dynamic behavior of the reinforced concrete deep beams with two static loading characteristics under different impact velocity and two impact effects is studied by experiments. The characteristics of the failure process and failure mode, the impact force and the response of the middle span displacement are carried out. The method of evaluating the impact bearing capacity of deep beams is discussed. The finite element model of the impact behavior of deep beams is established by LS-DYNA, and the test data are used to verify the influence of the stirrup rate on the dynamic response of the reinforced concrete deep beam under the impact load.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TU375.1

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本文編號：1932994