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以3种场地下的214条近断层地震记录为输入,以分别简化为理想弹塑性、双线性和刚度退化滞回模型的单自由度体系的桥梁结构在大量近场地震作用下的滞回耗能分析为基础,从地震动特征和结构特性2个角度分别定量讨论了多种因素对结构滞回耗能比值谱的影响规律;用数值计算结果对比验证了各学者所建议模型存在的不足,并用统计回归方法建议了适用于0~15 km近断层范围内的滞回耗能比值谱。结果表明:决定滞回耗能分配比例的主要因素是结构阻尼、延性系数和结构自振周期;所建议的比值谱能更全面地反映影响能量分配的主要因素,且取值更符合实际地震动的能量分配特征,可用于基于能量原理的桥梁结构抗震设计。
Taking 214 near-fault seismograms recorded at three sites as input, the hysteresis of the bridge structure under single-degree-of-freedom system, which is simplified to the ideal elasto-plasticity, bilinear and stiffness degenerate hysteretic model, respectively, under a large number of near-field earthquakes Based on the energy dissipation analysis, the influences of many factors on the hysteresis energy ratio spectrum were quantitatively discussed from the two aspects of the ground motion characteristics and the structural characteristics. The numerical results were compared to verify the deficiencies of the proposed models , And the statistical regression method is suggested to be suitable for hysteresis energy ratio spectrum in the range of 0 ~ 15 km near fault. The results show that the main factors that determine the proportion of energy dissipation in hysteresis are the structural damping, ductility coefficient and the period of natural vibration of the structure. The proposed ratio spectrum can more fully reflect the main factors affecting the energy distribution and the values are more in line with the actual ground motion The energy distribution characteristics of the bridge structure can be used to design earthquake-resistant bridges.