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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。
In the aseismic design of frame-core tube structure, as the outer frame part of the second line of defense, its internal force needs to be adjusted, but there is a difference in the adjustment methods and adjustment requirements in our country’s relevant standards, which makes the design have a certain degree of uncertainty . Based on the analysis and interpretation of the standard provisions of JGJ 3-2010, CECS 230: 2008 and the U.S. IBC 2000 in China, this paper analyzes five aspects of the scope of application, the object of adjustment, the division of the dual anti-side force system, the reasonable stiffness of the frame and the redistribution of internal forces , Comparative analysis is based on the difference of base shear or maximum frame floor shear adjustment method and floor shear adjustment method. Taking an actual structure as an example, the influence of different adjustment methods on the design of each part is studied by elasto-plastic analysis and shaking table test. The results show that the outer frame and the core tube can be separated from each other by two ways: the outer frame and the core tube can be defined as two lines of defense, Force and stiffness coordination match, the bearing capacity can be based on floor shear adjustment method, the adjustment object in addition to shear and bending moments should also include axial force, the minimum share of both the sum of 100%, the framework of the minimum and maximum The share ratios are 20% and 80%, respectively. For the stiffness matching between the two, the generalized stiffness and eigenvalue can be used to evaluate the stiffness. The reasonable range of values is 1 ~ 3 and 0.2 ~ 0.9 respectively.