补国斌, 周靖, 王菁菁. 速度脉冲地震和结构偏心耦合效应对结构影响系数的修正[J]. 工程力学, 2019, 36(8): 217-225. DOI: 10.6052/j.issn.1000-4750.2018.12.0725
引用本文: 补国斌, 周靖, 王菁菁. 速度脉冲地震和结构偏心耦合效应对结构影响系数的修正[J]. 工程力学, 2019, 36(8): 217-225. DOI: 10.6052/j.issn.1000-4750.2018.12.0725
BU Guo-bin, ZHOU Jing, WANG Jing-jing. MODIFICATION OF STRUCTURAL INFLUENCE FACTORS FOR THE COUPLING EFFECT OF PULSE-LIKE GROUND MOTION AND STRUCTURAL ECCENTRICITY[J]. Engineering Mechanics, 2019, 36(8): 217-225. DOI: 10.6052/j.issn.1000-4750.2018.12.0725
Citation: BU Guo-bin, ZHOU Jing, WANG Jing-jing. MODIFICATION OF STRUCTURAL INFLUENCE FACTORS FOR THE COUPLING EFFECT OF PULSE-LIKE GROUND MOTION AND STRUCTURAL ECCENTRICITY[J]. Engineering Mechanics, 2019, 36(8): 217-225. DOI: 10.6052/j.issn.1000-4750.2018.12.0725

速度脉冲地震和结构偏心耦合效应对结构影响系数的修正

MODIFICATION OF STRUCTURAL INFLUENCE FACTORS FOR THE COUPLING EFFECT OF PULSE-LIKE GROUND MOTION AND STRUCTURAL ECCENTRICITY

  • 摘要: 研究结构偏心和速度脉冲强震双重耦合不利对钢筋混凝土框架体系结构影响系数的修正措施。通过理论推导建立该耦合不利效应对结构影响系数的修正方法,给出修正系数计算流程。以最不利的强度偏心框架为对象,分别选取10条速度脉冲型和非速度脉冲型地震加速度记录,开展非线性动力时程分析,量化速度脉冲地震效应、偏心率、结构延性和楼层数对修正系数的影响规律。基于数值分析结果,建立修正系数的拟合关系式。结果表明,速度脉冲地震工况下的修正系数明显大于非速度脉冲工况。修正系数随偏心率增大,先线性增大后非线性急剧增大。偏心较小时,延性对修正系数的影响较小;偏心较大时,修正系数随延性的增大而减小。楼层数对修正系数无明显影响。拟合的修正系数关系式可为抗震设计中综合考虑速度脉冲地震和结构偏心的不利影响提供参考。

     

    Abstract: The modification of the structural influence factors considering the adverse effects from both structural eccentricity and pulse-like earthquake effect was investigated for reinforced concrete frame systems. The modification method was established theoretically and the calculating process was described. Ten pulse-like and ten non-pulse-like ground motions were employed in the nonlinear dynamic time history analysis on frames with the most unfavorable strength eccentricity. The relationships between the modification factor and the pulse-like effect, eccentricity, ductility and story number were studied quantitatively. Based on the numerical results, a fitting formula was established to estimate the modification factor. It showed that the modification factors for pulse-like cases were clearly greater than those for non-pulse-like cases. In addition, the modification factor increased linearly first and subsequently nonlinearly with an increasing eccentricity. The ductility had a small effect on systems with lower eccentricities, while for systems with higher eccentricities the modification factor decreased as the ductility increased. The influence of story number was not significant. Furthermore, the fitted formula can be applied as a reference in seismic design to comprehensively consider the disadvantages of the pulse-like earthquakes and structural eccentricity.

     

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