基础隔震结构在竖向荷载作用下的内力分布特点
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摘要
以一个3跨4排柱建筑为例,对非隔震结构和隔震结构在竖向荷载作用下的内力分布特点进行了对比研究,其中考虑了隔震层顶部梁板结构的荷载、刚度以及结构的梁柱刚度比等因素的影响。研究中发现,与非隔震结构相比,隔震结构一层柱子的柱端弯矩明显增大,隔震层顶部梁的梁端弯矩与其荷载成正比等规律。同时提出了基于非隔震结构的隔震结构在竖向荷载作用下内力的计算方法和"隔震影响系数"的概念。即,隔震结构的内力等于非隔震结构的内力乘以"隔震影响系数"。其中还进一步对"隔震影响系数"的影响因素进行了定量研究,得出了"隔震影响系数"的计算公式。本文所提出的计算方法与隔震结构在水平地震荷载作用下的内力计算方法思路一致,因此,该方法也进一步完善了隔震结构的设计理论。
The internal forces of a four-row three-span building with and without base isolation were compared in this paper.The influence of parameters,such as the load of isolation layer's top beam-slab,the stiffness of it and beam-column stiffness ratio of upper structure,were considered in the research.It is found that the end moments of the first floor's columns in base isolation structure increase remarkably compared to that of non-isolated structure,the end moments of the beams on the rubber bearings are proportional to the loads acted on it.Meanwhile,a method to calculate the internal force of base isolated structure under the vertical load is proposed based on non-isolated structure and a new concept of isolation influencing coefficient is present,in which,the internal forces of base isolated structure are obtained by multiplying that of non-isolated structure and the corresponding isolation influencing coefficient.On the other hand,the influence of some structural parameters and load to the factors was also investigated quantitatively,and the formulas to calculate these factors were given.Method proposed in this paper is consistent with that for horizontal load calculation.So,it improves the design theory of base isolated structure.
The internal forces of a four-row three-span building with and without base isolation were compared in this paper.The influence of parameters,such as the load of isolation layer's top beam-slab,the stiffness of it and beam-column stiffness ratio of upper structure,were considered in the research.It is found that the end moments of the first floor's columns in base isolation structure increase remarkably compared to that of non-isolated structure,the end moments of the beams on the rubber bearings are proportional to the loads acted on it.Meanwhile,a method to calculate the internal force of base isolated structure under the vertical load is proposed based on non-isolated structure and a new concept of isolation influencing coefficient is present,in which,the internal forces of base isolated structure are obtained by multiplying that of non-isolated structure and the corresponding isolation influencing coefficient.On the other hand,the influence of some structural parameters and load to the factors was also investigated quantitatively,and the formulas to calculate these factors were given.Method proposed in this paper is consistent with that for horizontal load calculation.So,it improves the design theory of base isolated structure.
引文
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(GB50011-2001).(in Chinese)
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