| The core-tube suspension structures can provide big rooms without column, and it has small area, which can solve space crowded and traffic problems. Furthermore, the core-tube suspension structure take the initiative in antiseism,and vary the dynamic behavior of this kind of structural system,Hence, which can take advantage of structural antiseism.This paper establishes the vibratory motion equation of two kinds of core-tube suspension structure, derives rigidity matrix ; programs by QBASIC to solve dynamical natural parameter of two kinds of core-tube suspension structure under the earthquake effect;discusses the suspended number of stories, the suspended weight of stories and the suspended balk effecting on the dynamic behavior of the core-tube suspension structure;At the same time, this paper discusses rigidity of spring and core-tube effecting on the dynamic behavior of the core-tube suspension structure when setting up a spring between the core-tube and the suspended stories, and draws a comparison between setting up a spring and without spring.Study show that: 1. the suspended number of stories, the suspended weight of stories, the height of suspended stories and the weight of suspended balk effect obviously on the dynamic behavior of the core-tube suspension structure. Hence, we can regulate first frequency of the core-tube suspension structures by regulating the suspended number of stories, the weight of suspended stories and suspended balk. 2. when setting up a spring between the core-tube and the suspended stories, it makes the system's frequency increase largely, makes structural rigidity improve; the rigidity of spring and core-tube effects largely on the dynamic behavior of the core-tube suspension structure, we can regulate first frequency of the core-tube suspension structures by regulating the rigidity of spring and core-tube. System's rigidity of setting up a spring every other one story is greater than without a spring, but smaller than setting up a spring each floor. |
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