体育场震后修复再建中混凝土结构消能减震设计研究

以往是用高层建筑防屈曲支撑的混凝土减震加固方法,以加固震后体育场混凝土结构的防屈曲支撑力为重点,存在的问题是未考虑结构不同部位节点的防屈曲消能减震支撑性能,加固效果差,需要深入研究混凝土结构建筑加固措施,提高震后体育场修复质量。研究采用基于性能和需求的消能减震设计方法,合理布置混凝土的消能支撑结构,在混凝土结构中底层节点设置防屈曲消能减震支撑,其他节点设置黏滞阻尼器,获取最佳阻尼器设置方案,提高结构减震加固效果。仿真实验说明,EL-Centro(NS)地震波和Newhall地震波情况下,所研究方法设计的消能减震新结构平均顶点侧移值分别比原结构小62 mm和110 mm;在不同震级的情况下,节点间位移角新结构小于原结构,说明该方法设计的体育场修复中混凝土结构减震稳定性强,是一种有效的减震加固方法。

Energy Dissipation Design for the Concrete Structures in a Stadiumin Post-earthquake Restoration and Reconstruction

Previous seismic retrofitting methods for high-rise buildings have focused on the strengthening of the buckling-resistant bracing of the concrete structures in the post-earthquake stadium; however, they seldom consider the energy dissipation performance of joints in different parts of the structure, resulting in a poor strengthening effect. It is necessary to study the measures for strengthening the concrete structures to improve the restoration quality of the post-earthquake stadium. In this study, the energy dissipation brace structure of concrete is reasonably arranged using the performance- and demand-based energy dissipation design methods. The buckling-resistant energy dissipation braces are installed at joints on the bottom floor of the concrete structure, and viscous dampers are installed at other joints to improve the seismic absorption and reinforcement effect of the structure. The simulation results denoted that the average top drifts of the new energy dissipation structure designed by this method was 62 and 110 mm smaller than those of the original structure under EL-Centro (NS) and Newhall waves, respectively; under earthquakes of different magnitudes, the displacement angle between the nodes of the new structure was smaller than that in the original structure. The concrete structure designed using the proposed method exhibited strong seismic absorption stability, indicating that the proposed energy-dissipating design method is effective in seismic reduction and structural reinforcement.