拱形建筑的抗震性能特征分析研究

The Seismic Behavior of The Arch Characteristics Analysis

拱形建筑的抗震性能特征分析数据量较大,导致传统的弹塑性时程分析方法由于工作量过大,计算过程复杂,不利于工程师完成设计,提出一种基于模态的Pushover抗震分析方法,对南塔塑造哑铃型承台模型以及分离式承台模型。在地震的影响下求出多自由度体系的动力平衡方程,对某阶振型参与质量和振型贡献参与质量比进行计算。在对侧向荷载分布进行分析的过程中,研究和拱形建筑墩节点相应的数阶振型。依据拱形建筑工程特点以及结构的重要性,采用地震水平II概率水平的地震加速度时程。对两种模型前5阶振型周期和振型进行分析。拱形建筑地震反应实际应用结果表明,分离式承台可增强主塔结构的抗震性能,而哑铃型承台可增强主塔基础的抗震性能,应综合分析对动轴力和弯矩的作用,才能准确选择有助于桩基础抗震性能的模型。

The seismic performance of arch characteristics analysis of large amount of data, the traditional method of elastic-plastic time history analysis due to the large workload, the calculation process is complex, is not conducive to engineer design, put forward a kind of based on modal Pushover seismic analysis methods, to the south tower shape dumbbell pile caps model and separate pile caps.Under the influence of the earthquake and the dynamic equilibrium equation of multi degree of freedom system, for a certain order modal participation mass and modal contribution to participate in mass ratio to calculate. The analysis of lateral load distribution in the process of research and arch mound node corresponding number order vibration mode.According to the arch construction engineering characteristics and the importance of the structure, the level II seismic probability levels of earthquake acceleration time history. The former two models 5 cycle mode shapes and modal analysis.Arch seismic response of the actual application results show that the separate pile caps can enhance the seismic performance of the main tower structure, and dumbbell pile caps can enhance the seismic performance of the main tower foundation, should be comprehensive analysis of the role of axial force and bending moment, to accurately select help model of the seismic performance of pile foundation.