考慮動(dòng)力效應(yīng)的鋼筋混凝土柱抗震性能研究
發(fā)布時(shí)間：2018-11-28 08:14
【摘要】：鋼筋混凝土結(jié)構(gòu)在地震作用下的動(dòng)力響應(yīng)通常會(huì)受到荷載速率的影響,而鋼筋混凝土柱作為主要的承重構(gòu)件,其在不同加載速率下的抗震性能研究尚且較少,同時(shí),目前的結(jié)構(gòu)抗震設(shè)計(jì)規(guī)范并未涉及由荷載速率引起的鋼筋混凝土構(gòu)件力學(xué)性能和變形性能變化方面的條款。本文基于試驗(yàn)研究和數(shù)值計(jì)算相結(jié)合的方法,分析了地震荷載速率作用下鋼筋混凝土柱的率敏感性對其力學(xué)特性的影響,主要內(nèi)容歸結(jié)如下： (1)試驗(yàn)研究了加載速率對鋼筋混凝土柱力學(xué)性能和變形性能的影響。主要考慮的因素有：剪跨比、軸壓比、混凝土強(qiáng)度、縱筋強(qiáng)度等級、縱向配筋率、體積配箍率、加載模式(單向加載、雙向加載和變軸力加載)和加載速率。試驗(yàn)結(jié)果表明,隨著加載速率的提高,構(gòu)件的屈服承載力和極限承載力均有所增加,且屈服承載力增加的程度更為顯著；加載速率的提高導(dǎo)致構(gòu)件的強(qiáng)度退化、剛度退化和損傷加劇,延性略有降低,耗能則有所增加；軸力變化加劇了構(gòu)件的率敏感性,使構(gòu)件在加載后期提前失穩(wěn)；雙向加載過程中存在的耦聯(lián)作用則進(jìn)一步加劇了柱強(qiáng)度退化和剛度退化的進(jìn)程。另外,基于理論分析發(fā)現(xiàn),在快速加載條件下柱的截面受壓區(qū)高度略有減小,加載速率導(dǎo)致柱的抗彎承載力的增長水平遠(yuǎn)高于抗剪承載力,同時(shí),加載速率的提高致使構(gòu)件的破壞機(jī)理也發(fā)生明顯改變。 (2)試驗(yàn)研究了鋼筋混凝土柱在不同加載路徑下的動(dòng)力特性,主要考慮的加載路徑有：單向循環(huán)加載、十字形加載、菱形加載和圓形加載路徑。試驗(yàn)結(jié)果表明,加載路徑和加載速率的綜合作用使柱的強(qiáng)度退化、剛度退化、延性降低程度均明顯提高；通過雙向加載條件下的等效阻尼比計(jì)算結(jié)果,可以看到,圓形加載路徑下柱的耗能能力最強(qiáng);加載速率使柱的荷載-位移骨架曲線在加載后期斜率下降更為迅速,這種現(xiàn)象在菱形加載路徑下表現(xiàn)更為顯著；經(jīng)過回歸分析給出了不同加載路徑下靜力和動(dòng)力加載的等效阻尼比計(jì)算的經(jīng)驗(yàn)公式。 (3)基于OpenSees中的分布塑性鉸模型,數(shù)值計(jì)算給出了不同材料應(yīng)變率下柱單調(diào)加載條件下的荷載-位移關(guān)系曲線和地震作用下柱的動(dòng)力響應(yīng),并通過回歸分析給出了不同材料應(yīng)變率下柱極限承載力的動(dòng)力增長因子經(jīng)驗(yàn)公式。另外,基于OpenSees中的BeamwithHingesElement單元,引入鋼筋和混凝土材料的應(yīng)變率效應(yīng),考慮了構(gòu)件的雙向彎曲、軸力的耦聯(lián)作用及剪切、粘結(jié)滑移效應(yīng),編制了鋼筋混凝土柱的Tcl程序,對不同加載路徑下的鋼筋混凝土柱進(jìn)行了數(shù)值模擬,并與試驗(yàn)結(jié)果進(jìn)行了對比。
[Abstract]:The dynamic response of reinforced concrete structures under earthquake is usually affected by the load rate. However, as the main load-bearing members, the seismic behavior of reinforced concrete columns under different loading rates is still less studied, and at the same time, The current code for seismic design of structures does not deal with the changes in mechanical properties and deformation properties of reinforced concrete members caused by load rate. Based on the combination of experimental study and numerical calculation, this paper analyzes the effect of the rate sensitivity of reinforced concrete columns on their mechanical properties under the action of seismic load rate. The main contents are summarized as follows: (1) the effect of loading rate on the mechanical and deformation properties of reinforced concrete columns is studied. The main factors considered are: shear span ratio, axial compression ratio, concrete strength, longitudinal reinforcement strength grade, longitudinal reinforcement ratio, volume hoop ratio, loading mode (unidirectional loading, biaxial loading and variable axial force loading) and loading rate. The experimental results show that with the increase of loading rate, both the yield bearing capacity and the ultimate bearing capacity of the members increase, and the degree of the increase of the yield bearing capacity is more obvious. The increase of loading rate leads to the degradation of strength, the degradation of stiffness and damage, the decrease of ductility and the increase of energy consumption, the change of axial force increases the sensitivity of the component, which makes the member lose stability in advance in the later stage of loading. The coupling action in the bidirectional loading process further intensifies the degradation of strength and stiffness of columns. In addition, based on the theoretical analysis, it is found that the height of the section compression zone decreases slightly under the rapid loading condition, and the loading rate leads to the increase of the flexural capacity of the column far higher than that of the shear bearing capacity, and at the same time, With the increase of loading rate, the failure mechanism of the components is obviously changed. (2) the dynamic characteristics of reinforced concrete columns under different loading paths are studied experimentally. The main loading paths are unidirectional cyclic loading, cross loading, rhombic loading and circular loading path. The experimental results show that the strength, stiffness and ductility of the columns are degraded by the combined action of loading path and loading rate. Through the results of the equivalent damping ratio under biaxial loading, it can be seen that the energy dissipation capacity of the column under circular loading path is the strongest. The loading rate makes the load-displacement skeleton curve of the column decrease more rapidly at the later stage of loading, which is more obvious under the rhombus loading path. The empirical formulas for calculating the equivalent damping ratio of static and dynamic loads under different loading paths are given by regression analysis. (3) based on the distributed plastic hinge model in OpenSees, the load-displacement curve under monotone loading and the dynamic response of the column under earthquake are obtained. The empirical formula of dynamic growth factor of column ultimate bearing capacity under different material strain rates is given by regression analysis. In addition, based on the BeamwithHingesElement element in OpenSees, the strain rate effect of steel bar and concrete material is introduced, and the Tcl program of reinforced concrete column is programmed by considering the bidirectional bending, coupling effect of axial force and shear, bond-slip effect. The reinforced concrete columns with different loading paths are numerically simulated and compared with the experimental results.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU375.3;TU352.11
本文編號(hào)：2362316
[Abstract]:The dynamic response of reinforced concrete structures under earthquake is usually affected by the load rate. However, as the main load-bearing members, the seismic behavior of reinforced concrete columns under different loading rates is still less studied, and at the same time, The current code for seismic design of structures does not deal with the changes in mechanical properties and deformation properties of reinforced concrete members caused by load rate. Based on the combination of experimental study and numerical calculation, this paper analyzes the effect of the rate sensitivity of reinforced concrete columns on their mechanical properties under the action of seismic load rate. The main contents are summarized as follows: (1) the effect of loading rate on the mechanical and deformation properties of reinforced concrete columns is studied. The main factors considered are: shear span ratio, axial compression ratio, concrete strength, longitudinal reinforcement strength grade, longitudinal reinforcement ratio, volume hoop ratio, loading mode (unidirectional loading, biaxial loading and variable axial force loading) and loading rate. The experimental results show that with the increase of loading rate, both the yield bearing capacity and the ultimate bearing capacity of the members increase, and the degree of the increase of the yield bearing capacity is more obvious. The increase of loading rate leads to the degradation of strength, the degradation of stiffness and damage, the decrease of ductility and the increase of energy consumption, the change of axial force increases the sensitivity of the component, which makes the member lose stability in advance in the later stage of loading. The coupling action in the bidirectional loading process further intensifies the degradation of strength and stiffness of columns. In addition, based on the theoretical analysis, it is found that the height of the section compression zone decreases slightly under the rapid loading condition, and the loading rate leads to the increase of the flexural capacity of the column far higher than that of the shear bearing capacity, and at the same time, With the increase of loading rate, the failure mechanism of the components is obviously changed. (2) the dynamic characteristics of reinforced concrete columns under different loading paths are studied experimentally. The main loading paths are unidirectional cyclic loading, cross loading, rhombic loading and circular loading path. The experimental results show that the strength, stiffness and ductility of the columns are degraded by the combined action of loading path and loading rate. Through the results of the equivalent damping ratio under biaxial loading, it can be seen that the energy dissipation capacity of the column under circular loading path is the strongest. The loading rate makes the load-displacement skeleton curve of the column decrease more rapidly at the later stage of loading, which is more obvious under the rhombus loading path. The empirical formulas for calculating the equivalent damping ratio of static and dynamic loads under different loading paths are given by regression analysis. (3) based on the distributed plastic hinge model in OpenSees, the load-displacement curve under monotone loading and the dynamic response of the column under earthquake are obtained. The empirical formula of dynamic growth factor of column ultimate bearing capacity under different material strain rates is given by regression analysis. In addition, based on the BeamwithHingesElement element in OpenSees, the strain rate effect of steel bar and concrete material is introduced, and the Tcl program of reinforced concrete column is programmed by considering the bidirectional bending, coupling effect of axial force and shear, bond-slip effect. The reinforced concrete columns with different loading paths are numerically simulated and compared with the experimental results.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU375.3;TU352.11
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 胡時(shí)勝,王道榮;沖擊載荷下混凝土材料的動(dòng)態(tài)本構(gòu)關(guān)系[J];爆炸與沖擊;2002年03期
2 陳書宇;一種混凝土損傷模型和數(shù)值方法[J];爆炸與沖擊;1998年04期
3 孟春光;呂西林;;柔度法纖維模型在方鋼管混凝土柱滯回仿真中的應(yīng)用[J];地震工程與工程振動(dòng);2009年04期
4 王利恒;周錫元;閻維明;涂鳴;;鋼筋混凝土梁非線性動(dòng)力特性試驗(yàn)研究[J];地震研究;2006年01期
5 孫憲春;邱法維;萬力;;鋼筋混凝土柱在彎剪扭耦合作用下的試驗(yàn)研究[J];工程抗震與加固改造;2008年03期
6 方秦,柳錦春,張亞棟,錢七虎;爆炸荷載作用下鋼筋混凝土梁破壞形態(tài)有限元分析[J];工程力學(xué);2001年02期
7 吳建營;李杰;;反映阻尼影響的混凝土彈塑性損傷本構(gòu)模型[J];工程力學(xué);2006年11期
8 顧祥林;蔡茂;林峰;;地震作用下鋼筋混凝土柱受力性能研究[J];工程力學(xué);2010年11期
9 許斌;龍業(yè)平;;基于纖維模型的鋼筋混凝土柱應(yīng)變率效應(yīng)研究[J];工程力學(xué);2011年07期
10 李兆霞;一個(gè)綜合模糊裂紋和損傷的混凝土應(yīng)變軟化本構(gòu)模型[J];固體力學(xué)學(xué)報(bào);1995年01期
相關(guān)博士學(xué)位論文 前1條
1 陳學(xué)偉;剪力墻結(jié)構(gòu)構(gòu)件變形指標(biāo)的研究及計(jì)算平臺(tái)開發(fā)[D];華南理工大學(xué);2011年
，本文編號(hào)：2362316
本文鏈接：http://sikaile.net/kejilunwen/sgjslw/2362316.html
最近更新
教材專著
