框架-核心筒结构的框架内力调整方法对比研究

发布时间：2019-02-22 21:48

【摘要】：在框架-核心筒结构的抗震设计中,作为二道防线的外框架部分,需要对其内力进行调整,但我国相关标准在调整方法和调整要求上存在差别,使得设计具有一定程度的不确定性。基于对我国JGJ 3—2010、CECS 230:2008和美国IBC 2000等标准规定的分析和解读,分别从适用范围、调整对象、双重抗侧力体系划分、框架合理刚度、内力重分布等5个方面,对比分析基于基底剪力或最大框架楼层剪力调整方法和基于楼层剪力调整方法的不同。以一实际结构为例,通过弹塑性分析和振动台试验研究了不同调整方法对各部分设计的影响。结果表明:可采用外框架和核心筒承担的剪力比例或者整体刚度分析方法来界定其是否为双重抗侧力体系;外框架与核心筒互为二道防线,在设计时,需对其承载力和刚度协调匹配,对承载力可采用基于楼层剪力的调整方法,调整对象除剪力和弯矩外也应包括轴力,两者的最小分担比例之和为100%,框架最小和最大分担比例分别为20%和80%,对于两者间的刚度匹配关系,可采用广义刚度特征值和刚度比参数来评价,其合理取值范围分别为1~3和0.2~0.9。
[Abstract]:In the seismic design of frame-core tube structure, as the outer frame part of two lines of defense, the internal force needs to be adjusted, but there are differences in adjustment methods and requirements in the relevant standards of our country. The design has a certain degree of uncertainty. Based on the analysis and interpretation of China's JGJ 3-2010 CECS 230: 2008 and the United States IBC 2000 standards, this paper discusses five aspects, including the scope of application, the object of adjustment, the division of dual lateral force system, the reasonable stiffness of the frame, the redistribution of internal force, etc. The difference between floor shear adjustment based on base shear or maximum frame shear is compared with that based on floor shear. Taking a practical structure as an example, the effects of different adjustment methods on the design of each part are studied by elastic-plastic analysis and shaking table test. The results show that the shear ratio between the outer frame and the core tube or the overall stiffness analysis method can be used to determine whether it is a double lateral force resistant system. The outer frame and the core tube are two lines of defense each other. In the design, the bearing capacity and stiffness should be matched harmoniously. The adjustment method based on the floor shear force can be adopted for the bearing capacity, and the adjusting object should include the axial force in addition to the shear force and the bending moment. The sum of the minimum sharing ratio of the two is 100 and the minimum and maximum sharing ratios of the frame are 20% and 80% respectively. The stiffness matching relationship between the two can be evaluated by the generalized stiffness eigenvalue and stiffness ratio parameter. The reasonable ranges of the values are 1 / 3 and 0. 2 / 0. 9, respectively.
【作者单位】：泰禾集团设计研发部;中冶京诚工程技术有限公司;
【基金】：北京市科技计划重点项目(D09050600370000)
【分类号】：TU973.17

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