典型宋式斗栱滞回耗能特性及其简化滞回模型研究

Research on hysteretic characteristics and simplified hysteretic model for typical Song Style Brackets Sets

合理可靠的斗栱数值模型是研究其滞回耗能特性的基础。通过对27个、4种典型宋式斗栱试验数据进行了对比分析,研究了不同形式斗栱的滞回耗能特性及其关键影响因素。在此基础上,提出了一种可反映不同形式斗栱滞回耗能特征的简化滞回模型,建议了关键滞回耗能参数的取值方法。结果表明:柱头铺作与补间铺作均呈现较为相似的、饱满的滞回特征,随着跳数的减少,滞回曲线渐趋饱满;叉柱造柱头铺作整体呈现明显的捏拢滞回特征,沿华栱方向加载所得的滞回曲线捏拢程度显著大于泥道栱方向;转角铺作滞回曲线最为饱满。数值模拟与试验结果对比表明,所提出的简化滞回模型及其关键滞回耗能参数取值方法可以准确反映不同形式斗栱的滞回耗能特征和总塑性耗能,验证了该模型的合理性和可靠性。

A reasonable and reliable numerical model for bracket sets is a critical issue in researching their hysteretic energy dissipating characterestics.Through the comparison and analysis of experimental results of 27 Song style bracket sets which were classified with four typical types,the characteristics of hysteretic curves and the associated key influencing factors for different types of bracket sets were identified.Based on these,a simplified hysteretic model,which can reflect the hysteretic characteristics of different types of bracket sets,was proposed.Furthermore,the determining method for the critical parameters of hysteretic rule was recommended.The results indicate that the Zhutou Puzuo and Bujian Puzuo types exhibit similar hysteretic characteristics.With the decrease of number of Tiao,the hysteretic curve becomes increasingly full.The hysteretic curve of the Chazhuzaotou Puzuo type exhibits significant pinching phenomena,which is more significant when the load is applied in the Huagong direction rather than the Nidaogong direction.The hysteretic curve of the Zhuanjiao puzuo type is the fullest.Comparison between simulated and experimental results indicates that the simplified hysteretic model and the corresponding determining method for critical parameters can accurately reflect the abovementioned characteristics of hysteretic curves and predict the total plastic energy of different types of bucket sets,thus validating the rationality and reliability of the simplified hysteretic model.