抗震框架柱端弯矩增大系数的构成因素识别及量化评价

发布时间：2018-06-08 05:55

本文选题：抗震钢筋混凝土框架 + 抗震措施　；参考：《地震工程与工程振动》2017年05期

【摘要】：钢筋混凝土柱端弯矩增大系数是减缓柱端在强地面运动下形成屈服区,改善结构性能的重要抗震措施。目前虽已见有对中国规范取值有效性的分析评价结果,但对影响其取值的主要因素与影响程度则未见有关文章发表。本文设计了不同抗震等级的3个典型空间框架结构,通过对其非弹性动力反应分析结果的逐时点量化识别以及梁端抗弯能力超强的考察,识别出"梁端抗弯能力超强"和"节点处柱端弯矩比例从多遇到罕遇地震作用的增长率"是决定ηc取值的两个主要因素,而柱轴力从多遇到罕遇地震作用的变化则对ηc取值无明显影响。在完成以上两个主要因素定量统计的基础上,对各抗震等级ηc的合理取值作了进一步评价。
[Abstract]:The increasing coefficient of bending moment at the end of reinforced concrete column is an important anti-seismic measure to slow down the yield zone of column end under strong ground motion and to improve the structure performance. Although there have been the results of analysis and evaluation of the validity of the Chinese norms, the main factors and the degree of influence on the values of Chinese norms have not been published. In this paper, three typical spatial frame structures with different seismic levels are designed. The time-point quantification of the results of inelastic dynamic response analysis and the investigation of the super flexural capacity at the end of the beam are carried out. It is recognized that "super flexural capacity at the end of beam" and "growth rate of moment ratio at the end of column at the joint from rare earthquake action" are the two main factors that determine the value of 畏 _ c. However, the change of column axial force from the frequent occurrence of rare earthquakes has no obvious effect on the 畏 c value. On the basis of the quantitative statistics of the above two main factors, the rational value of 畏 _ c for each seismic grade is further evaluated.
【作者单位】：重庆大学土木工程学院;中国建筑科学研究院;
【基金】：国家自然科学基金青年基金项目(51408575)~~
【分类号】：TU352.11;TU375.4

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