考虑剪切滞后效应的钢筋混凝土剪力墙单元模型及应用
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摘要
多垂直杆单元模型是在钢筋混凝土剪力墙非线性分析中较为常用的一种宏观模型。现有的分析方法不能考虑翼板剪滞效应的影响,然而翼板上正应力非均匀分布必然影响剪力墙承载力的充分发挥。其次现有的分析方法大多不能较好地考虑垂直杆中正应力对剪切刚度的影响。本文在多垂直杆单元模型的基础上进行改进,把垂直杆的轴向刚度和剪切刚度相结合,并引入剪滞位移自由度,摒弃平截面假定的限制,对一工程结构模型的静力分析显示其变形状态符合受力机理,对3片短肢剪力墙模型和1片剪力墙模型进行弹塑性静力加载分析,计算结果与试验结果吻合较好,表明该方法应用可行。
Multi-vertical truss element model is the most widely used macroscopic model in nonlinear analysis of RC shear wall.Methods available can not consider the shear-lag effect,however,the non-uniform distribution of normal stress in flange plate inevitably affects the full play of bearing capacity.The effect of normal stress in vertical truss on shear stiffness is mostly not considered in the methods available too.The multi-vertical truss element model is improved by the combination of axial stiffness with shear stiffness in vertical truss and introducing the cross section displacement function,which considers the shear-lag effect in flange plate,thus it is free from the restriction of plane section assumption.Static analysis of one engineering structure model shows the deformation state accords with mechanical mechanism.Three short-leg shear wall models and one shear wall model are respectively calculated by using the static elastic-plastic simulative analysis,and the calculation results are consistent with the experimental results.It is proved that the method is feasible.
Multi-vertical truss element model is the most widely used macroscopic model in nonlinear analysis of RC shear wall.Methods available can not consider the shear-lag effect,however,the non-uniform distribution of normal stress in flange plate inevitably affects the full play of bearing capacity.The effect of normal stress in vertical truss on shear stiffness is mostly not considered in the methods available too.The multi-vertical truss element model is improved by the combination of axial stiffness with shear stiffness in vertical truss and introducing the cross section displacement function,which considers the shear-lag effect in flange plate,thus it is free from the restriction of plane section assumption.Static analysis of one engineering structure model shows the deformation state accords with mechanical mechanism.Three short-leg shear wall models and one shear wall model are respectively calculated by using the static elastic-plastic simulative analysis,and the calculation results are consistent with the experimental results.It is proved that the method is feasible.
引文
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[8]李宏男,李兵.钢筋混凝土剪力墙抗震恢复力模型及试验研究[J].建筑结构学报,2004,25(5):35-42.LI Hongnan,LI Bing.Experimental study on seismic restoring performance of reinforced concrete shear walls[J].Journal of Building Structures,2004,25(5):35-42.(in Chinese)
[9]罗时磊,李青宁.短肢剪力墙的剪滞效应及其影响分析[J].西安建筑科技大学学报:自然科学版,2003,35(4):329-333.LUO Shilei,LI Qingning.Shear lag in short leg walls and its effects[J].J.Xi’an Univ.of Arch.&Tech.:Natural Science Edition,2003,35(4):329-333.(in Chinese)
[2]张军某,李青宁,罗时磊.短肢剪力墙空间剪滞墙元模型[J].世界地震工程,2005,21(1):111-116.ZHANG Junmou,LI Qingning,LUO Shilei.Space wall model of short-leg shear wall considering shear-lag[J].World Earthquake Engineering,2005,21(1):111-116.(in Chinese)
[3]李青宁,王宁,蔡卫宁.T形剪力墙弹塑性模型及地震反应分析[J].地震工程与工程振动,2004,24(12):69-74.LI Qingning,WANG Ning,CAI Weining.Elastic-plastic model and seismic analysis of T shaped short leg shear wall[J].Journal of Earthquakeand Engineering Vibration,2004,24(12):69-74.(in Chinese)
[4]张守军,李青宁,郭泽英,等.T形截面短肢剪力墙剪滞效应及其影响[J].工业建筑,2007,37(10):38-41.ZHANG Shoujun,LI Qingning,GUO Zeying,et al.Shear lag and its effect of T-shaped short-Leg shear wall[J].Industrial Architecture,2007,37(10):38-41.(in Chinese)
[5]李青宁,李晓蕾,阎艳伟,等.钢筋混凝土短肢剪力墙抗震性能试验研究[J].建筑结构学报,2011,32(4):53-63.LI Qingning,LI Xiaolei,YAN Yanwei,et al.Experimental research on seismic performance of reinforced concrete short-leg shear wall[J].Journal of Building Structures,2011,32(4):53-63.(in Chinese)
[6]张品乐,李青宁,李小蕾.L形截面短肢剪力墙抗震性能的模型试验研究[J].地震工程与工程振动,2010,30(4):51-56.ZHANG Pinle,LI Qingning,LI Xiaolei.Experimental research on seismic performance of short pier shear wall L-shaped section[J].Journal ofEarthquake Engineering and Engineering Vibration,2010,30(4):51-56.(in Chinese)
[7]蒋欢军,吕西林.一种宏观剪力墙单元模型应用研究[J].地震工程与工程振动,2003,23(1):38-43.JIANG Huangjun,LXilin.Research on application of macroscopic shear wall mode[J].Journal of Earthquake Engineering and EngineeringVibration,2003,23(1):38-43.(in Chinese)
[8]李宏男,李兵.钢筋混凝土剪力墙抗震恢复力模型及试验研究[J].建筑结构学报,2004,25(5):35-42.LI Hongnan,LI Bing.Experimental study on seismic restoring performance of reinforced concrete shear walls[J].Journal of Building Structures,2004,25(5):35-42.(in Chinese)
[9]罗时磊,李青宁.短肢剪力墙的剪滞效应及其影响分析[J].西安建筑科技大学学报:自然科学版,2003,35(4):329-333.LUO Shilei,LI Qingning.Shear lag in short leg walls and its effects[J].J.Xi’an Univ.of Arch.&Tech.:Natural Science Edition,2003,35(4):329-333.(in Chinese)
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