钢筋混凝土框架结构超强特征及其影响因素研究

发布时间：2018-11-15 06:58

【摘要】：结构超强现象普遍存在，它相当于提高了结构的设计地震作用水准，对结构在强震作用下保持良好性能，防止倒塌等起着重要作用。虽然国内外学者进行了大量的研究，但是结构超强研究存在较大的差异性，本文总结了现有超强分析研究存在的主要问题： (1)结构超强分析方法及软件计算模型的差异性； (2)结构失效标准选取的差异性； (3)超强分析的对象不同； (4)双向地震作用研究的欠缺； (5)非结构构件——填充墙竖向不规则布置的研究较为欠缺。基于以上问题，本文初步完成了以下三个方面的研究工作： (1)严格按照规范设计6栋不同高度钢筋混凝土框架结构，，以三维空间框架为研究对象，采用统一的失效标准，对结构进行静力推覆分析（pushover）和单向增量动力分析（IDA），考察两种分析方法的差异性及结构超强的变化规律。 (2)对结构进行双向地震动输入下的IDA分析，考察此时结构超强的变化规律，并比较单、双向IDA分析下结构超强的差异性。 (3)考察典型空间框架在考虑不同填充墙布置情况下结构超强能力的影响。通过以上研究，得出的主要结论如下： (1) Pushover分析与单向IDA分析得出的超强系数在层数较少时较为接近，层数较多时，IDA分析得出的超强系数均大于pushover分析得出的超强系数；两种分析方法得出的超强系数变化规律较为一致，即1层到5层超强系数逐渐降低，7层以后逐渐变大，到9层以后变化趋于平缓。 (2)与单向IDA分析相比，双向IDA分析时结构的超强系数均会出现不同程度的降低，并且结构层间变形机制会发生改变，结构也提早进入失效状态。 (3)结构满布填充墙时结构超强提高的程度较大，底层架空时结构超强提高的较小，上部某楼层架空时对结构超强影响不明显。 (4)填充墙对结构超强的影响与结构层数有关，结构层数小于7层且底层非架空时，填充墙对超强的提高程度大，同种填充墙布置下的12层结构，填充墙对超强的提高程度较小；若结构底层出现架空层，则填充墙对超强提高均不明显。(5)严格按照我国规范设计的钢筋混凝土空间框架结构超强系数最小值建议取2.0。
[Abstract]:The phenomenon of super strength of structure exists generally, which is equivalent to raising the level of design earthquake action of structure, and plays an important role in maintaining good performance of structure under strong earthquake, preventing collapse and so on. Although scholars at home and abroad have done a lot of research, there is a great difference in the study of structural superstrength. In this paper, the main problems in the research of superstrength analysis are summarized: (1) the differences of the structural superstrength analysis methods and the software calculation models; (2) difference of structural failure criteria, (3) different objects of super strength analysis, (4) lack of research on bidirectional seismic action; (5) the research on the vertical irregular arrangement of the non-structural member-infilled wall is deficient. Based on the above problems, this paper has preliminarily completed the following three aspects of the research work: (1) six reinforced concrete frame structures with different heights are designed strictly according to the specifications, and the three-dimensional spatial frame is taken as the research object. According to the unified failure criterion, the difference of the two analysis methods and the variation law of the superstrength of the structure are investigated by static push-over analysis (pushover) and unidirectional incremental dynamic analysis (IDA),). (2) the IDA analysis of the structure under the bidirectional ground motion input is carried out, and the variation law of the structure superstrength is investigated, and the difference of the structure super strength under the single and bidirectional IDA analysis is compared. (3) the influence of the super-capacity of the typical space frame under the condition of different infill wall arrangement is investigated. Through the above research, the main conclusions are as follows: (1) the superstrength coefficient obtained by Pushover analysis and unidirectional IDA analysis is close when the number of layers is less, and when the number of layers is more, The superstrength coefficient obtained by IDA analysis is higher than that by pushover analysis. The changes of the superstrength coefficients obtained by the two analysis methods are consistent, that is, the super-strength coefficients of one to five layers decrease gradually, the latter gradually become larger after 7 layers, and the change tends to be flat after 9 layers. (2) compared with the unidirectional IDA analysis, the superstrength coefficients of the structures in the bidirectional IDA analysis will be reduced to varying degrees, and the deformation mechanism between the layers of the structures will be changed, and the structure will enter into the failure state earlier. (3) when the structure is filled with filled walls, the degree of the super strength of the structure is higher than that of the bottom floor, and the influence of the upper floor on the super strength of the structure is not obvious when the upper floor is overhead. (4) the influence of infilled wall on the super strength of the structure is related to the number of layers of the structure. When the number of structural layers is less than 7 stories and the bottom floor is not overhead, the effect of the infilled wall on the super strength of the structure is large, and the 12-story structure of the same type of infill wall is arranged. The enhancement degree of the infill wall to the super strength is small; If there is an overhead layer at the bottom of the structure, the enhancement of the superstrength of the infilled wall is not obvious. (5) the minimum value of the superstrength coefficient of the reinforced concrete spatial frame structure designed strictly according to the code of our country is suggested to be 2.0.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375.4

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