钢筋混凝土核心筒的非线性分析
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摘要
随着高层建筑的兴起,核心筒结构体系的使用将越来越多,作为高层以及超高层建筑重要的抗侧力构件,对核心筒的理论分析方法和力学性能的研究具有重要的意义。由于实际中核心筒一般都达到一百米以上,试验条件的限制成为核心筒研究的一个瓶颈,通过借助目前使用较多,计算结果较为精确的非线性分析软件进行模拟无疑是一种重要的研究手段。
本文利用两种非线性分析软件ABAQUS和CANNY,分别使用两种分析模型,微观壳单元和宏观纤维模型来研究计算模拟核心筒在不同轴压比、连梁刚度、配筋率、高宽比以及加载角度下的力学性能,并与试验进行对比,一方面用以研究两种模型和分析方法对核心筒的有效性;另一方面利用软件分析得出核心筒力学性能的一般结论。计算分析所得核心筒在轴压比、连梁刚度、配筋率、高宽比等因素影响下的结论与试验结果基本一致,这也说明了非线性有限元模拟这种理论研究方法在今后核心筒等高层复杂结构分析中的可行性。
通过微观壳单元对核心筒的建模分析,可以得出该种单元在考虑构件材料的实际性能上比较欠缺,通常引起过高估计构件的刚度问题,而且壳元对剪力墙平面外刚度无法顾及,在大轴压比情况下以及结构高度增加P-△效应比较明显的情况下,所得到的结果与试验值相差较多,而且微观单元计算时间较长,无法满足更多方面的需要。而采用宏观的模型,即将一片剪力墙作为一个单元,通过纤维模型模拟构件的轴力和双向弯矩作用,添加单轴剪切弹簧考虑构件的剪切性能,从而准确全面地研究剪力墙在拉压弯剪共同作用下的力学性能。但这种计算方法无法肯定构件在大变形和严重损坏下力学性能的准确性。
With the development of high-rise building,the core tube structure system will be used more and more as the high-rise and super high-rise buildings important component of the lateral load resistance.The theoretical analysis method and study of mechanical properties of the core wall is important.As the actual core tube generally achieve more than 100 meters,test conditions become a bottleneck of the study,and with the use of more precise calculations of finite element analysis software,simulating this is an important research tools,and the finite element selection,the use of numerical methods have a direct impact on the reliability of the final results.
In this paper,two non-linear analysis software:ABAQUS and CANNY,were used to analyze that the simulation core wall at different axial load ratio,different coupled -beam stiffness,the steel ratio,height-width ratio as well as the load angle with two models,the shell element and fiber model.Compared with the test,on the one hand, study the effectiveness of the analysis of the core wall with two models;On the other hand,through the software analysis,the mechanical properties of the core wall was received.
Through the shell element of the modeling analysis of the core wall,the elements is not conformed with the actual performance of the material,usually caused by overestimated the stiffness of components,and shell element stiffness.of the out-of plane can not be taken into account.In the case of high axial load ratio,as well as the structure of a high degree of increase in P-△effects of the more obvious cases,the results obtained with the experimental value of the difference between large,and shell-element long time,unable to meet the needs anymore.The use of a fiber model,is about a wall as a element.Fiber model is a discredited-section model as well and is used to represent the interaction among biaxial bending and axial tension/compression.Realistic material stress-strain models can be used to characterize uniaxial spring(or fiber).At critical section of a line element,the fiber slice represents moment-curvature relations.Therefore, the distribution of the nonlinearity has to be assumed.However,this method of calculation can not be certain components in the deformation and mechanical properties under severe damage to the accuracy,elasticity and elastoplasticity therefore can only be calculated.
The entire calculation and simulation software is mostly consistent with the test results, which able to explain parameter values of the core wall in the appropriate circumstances; different axial load ratio,coupled-beam stiffness,the steel ratio,height-width ratio as well as the load angle influence the strength and ductility of reinforced concrete core wall.This also explains the non-linear finite element method simulation of this theory the core wall in the future of complex structures such as high-rise feasibility analysis.
本文利用两种非线性分析软件ABAQUS和CANNY,分别使用两种分析模型,微观壳单元和宏观纤维模型来研究计算模拟核心筒在不同轴压比、连梁刚度、配筋率、高宽比以及加载角度下的力学性能,并与试验进行对比,一方面用以研究两种模型和分析方法对核心筒的有效性;另一方面利用软件分析得出核心筒力学性能的一般结论。计算分析所得核心筒在轴压比、连梁刚度、配筋率、高宽比等因素影响下的结论与试验结果基本一致,这也说明了非线性有限元模拟这种理论研究方法在今后核心筒等高层复杂结构分析中的可行性。
通过微观壳单元对核心筒的建模分析,可以得出该种单元在考虑构件材料的实际性能上比较欠缺,通常引起过高估计构件的刚度问题,而且壳元对剪力墙平面外刚度无法顾及,在大轴压比情况下以及结构高度增加P-△效应比较明显的情况下,所得到的结果与试验值相差较多,而且微观单元计算时间较长,无法满足更多方面的需要。而采用宏观的模型,即将一片剪力墙作为一个单元,通过纤维模型模拟构件的轴力和双向弯矩作用,添加单轴剪切弹簧考虑构件的剪切性能,从而准确全面地研究剪力墙在拉压弯剪共同作用下的力学性能。但这种计算方法无法肯定构件在大变形和严重损坏下力学性能的准确性。
With the development of high-rise building,the core tube structure system will be used more and more as the high-rise and super high-rise buildings important component of the lateral load resistance.The theoretical analysis method and study of mechanical properties of the core wall is important.As the actual core tube generally achieve more than 100 meters,test conditions become a bottleneck of the study,and with the use of more precise calculations of finite element analysis software,simulating this is an important research tools,and the finite element selection,the use of numerical methods have a direct impact on the reliability of the final results.
In this paper,two non-linear analysis software:ABAQUS and CANNY,were used to analyze that the simulation core wall at different axial load ratio,different coupled -beam stiffness,the steel ratio,height-width ratio as well as the load angle with two models,the shell element and fiber model.Compared with the test,on the one hand, study the effectiveness of the analysis of the core wall with two models;On the other hand,through the software analysis,the mechanical properties of the core wall was received.
Through the shell element of the modeling analysis of the core wall,the elements is not conformed with the actual performance of the material,usually caused by overestimated the stiffness of components,and shell element stiffness.of the out-of plane can not be taken into account.In the case of high axial load ratio,as well as the structure of a high degree of increase in P-△effects of the more obvious cases,the results obtained with the experimental value of the difference between large,and shell-element long time,unable to meet the needs anymore.The use of a fiber model,is about a wall as a element.Fiber model is a discredited-section model as well and is used to represent the interaction among biaxial bending and axial tension/compression.Realistic material stress-strain models can be used to characterize uniaxial spring(or fiber).At critical section of a line element,the fiber slice represents moment-curvature relations.Therefore, the distribution of the nonlinearity has to be assumed.However,this method of calculation can not be certain components in the deformation and mechanical properties under severe damage to the accuracy,elasticity and elastoplasticity therefore can only be calculated.
The entire calculation and simulation software is mostly consistent with the test results, which able to explain parameter values of the core wall in the appropriate circumstances; different axial load ratio,coupled-beam stiffness,the steel ratio,height-width ratio as well as the load angle influence the strength and ductility of reinforced concrete core wall.This also explains the non-linear finite element method simulation of this theory the core wall in the future of complex structures such as high-rise feasibility analysis.
引文
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