基于协同工作原理的框架-核心筒结构框剪比研究
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摘要
基于框架-核心筒结构协同工作原理建立变刚度条件下的等效连续化简化分析模型,通过力平衡关系和位移协调条件建立微分方程,并结合边界条件采用数值方法求解,得到变刚度框架-核心筒结构在倒三角分布侧向力作用下的剪力分配规律。从双重抗侧体系协同工作角度揭示了框剪比这一指标的物理意义、分布规律以及影响因素。分析表明,框剪比数值大小与结构刚度特征值、结构顶部与底部的刚度比以及沿高度的刚度变化速率相关,变刚度条件下框剪比分布规律与一致刚度相比有明显差异。根据分析结果对现行规范和超限审查技术要点中关于框剪比的规定进行了探讨。
Based on the cooperative work principle of frame-core tube structure, a simplified and equivalent continuum analysis model with nonuniform lateral stiffness distribution is established. The differential equation is derived by force balance relation and displacement coordination condition. Solving the equation by numerical method combined with boundary conditions, the shear force distribution law of frame-core tube structure with nonuniform lateral stiffness under the inverted triangular distribution lateral force is obtained. The physical meaning, distribution and influencing factors of the frame-shear ratio index are revealed from the angle of the cooperative work of the dual system. The analysis shows that the value of frame-shear ratio is related to the stiffness characteristic value, the ratio of stiffness at the top to the bottom and the rate of stiffness change along the height. The frame-shear ratio distribution of frame-core tube with nonuniform stiffness is obviously different from that with uniform stiffness. Based on the analysis results, the provisions on the frame-shear ratio in the current code and the technical points of expert panel review for seismic design of over-limit high rise buildings are discussed.
Based on the cooperative work principle of frame-core tube structure, a simplified and equivalent continuum analysis model with nonuniform lateral stiffness distribution is established. The differential equation is derived by force balance relation and displacement coordination condition. Solving the equation by numerical method combined with boundary conditions, the shear force distribution law of frame-core tube structure with nonuniform lateral stiffness under the inverted triangular distribution lateral force is obtained. The physical meaning, distribution and influencing factors of the frame-shear ratio index are revealed from the angle of the cooperative work of the dual system. The analysis shows that the value of frame-shear ratio is related to the stiffness characteristic value, the ratio of stiffness at the top to the bottom and the rate of stiffness change along the height. The frame-shear ratio distribution of frame-core tube with nonuniform stiffness is obviously different from that with uniform stiffness. Based on the analysis results, the provisions on the frame-shear ratio in the current code and the technical points of expert panel review for seismic design of over-limit high rise buildings are discussed.
引文
[1] 徐培福,傅学怡,王翠坤,等.复杂高层建筑结构设计[M].北京:中国建筑工业出版社,2005
[2] Bryan Stafford Smith,Alex Coull. Tall building structures: analysis and design[M]. New York: John Wiley & Sons,Inc.,1991
[3] 方鄂华,钱稼茹,叶列平.高层建筑结构设计[M].北京:中国建筑工业出版社,2003
[4] GB 50011—2010,建筑抗震设计规范[S]
[5] JGJ 3—2010,高层建筑混凝土结构技术规程[S]
[6] 超限高层建筑工程抗震设防专项审查技术要点 [Z].北京:中华人民共和国住房和城乡建设部,2015
[7] 徐培福,薛彦涛,肖从真,等.高层型钢混凝土框筒混合结构抗震性能试验研究[J].建筑结构,2005,35(5):3-8
[8] 白国良,楚留声,李晓文.高层框架-核心筒结构抗震防线问题研究[J].西安建筑科技大学学报(自然科学版),2007,39(4):445-450
[9] 聂建国,田淑明,矫金广.框架-核心筒组合结构体系在选型中的刚度规律[J].建筑科学与工程学报,2008,25(1):10-17
[10] 扶长生,张小勇,周立浪.框架-核心筒结构体系及其地震剪力分担比[J].建筑结构,2015,45(4):1-8
[11] 魏琏,孙仁范,王森,等.高层框筒结构框架部分剪力比研究[J].建筑结构,2017,47(3):28-33
[12] Eduardo Miranda, Carlos J. Reyes. Approximate lateral drift demands in multistory buildings with nonuniform stiffness[J]. Journal of Structural Engineering, 2002, 128(7): 840-849
[2] Bryan Stafford Smith,Alex Coull. Tall building structures: analysis and design[M]. New York: John Wiley & Sons,Inc.,1991
[3] 方鄂华,钱稼茹,叶列平.高层建筑结构设计[M].北京:中国建筑工业出版社,2003
[4] GB 50011—2010,建筑抗震设计规范[S]
[5] JGJ 3—2010,高层建筑混凝土结构技术规程[S]
[6] 超限高层建筑工程抗震设防专项审查技术要点 [Z].北京:中华人民共和国住房和城乡建设部,2015
[7] 徐培福,薛彦涛,肖从真,等.高层型钢混凝土框筒混合结构抗震性能试验研究[J].建筑结构,2005,35(5):3-8
[8] 白国良,楚留声,李晓文.高层框架-核心筒结构抗震防线问题研究[J].西安建筑科技大学学报(自然科学版),2007,39(4):445-450
[9] 聂建国,田淑明,矫金广.框架-核心筒组合结构体系在选型中的刚度规律[J].建筑科学与工程学报,2008,25(1):10-17
[10] 扶长生,张小勇,周立浪.框架-核心筒结构体系及其地震剪力分担比[J].建筑结构,2015,45(4):1-8
[11] 魏琏,孙仁范,王森,等.高层框筒结构框架部分剪力比研究[J].建筑结构,2017,47(3):28-33
[12] Eduardo Miranda, Carlos J. Reyes. Approximate lateral drift demands in multistory buildings with nonuniform stiffness[J]. Journal of Structural Engineering, 2002, 128(7): 840-849