Seismic analysis of the frame structure reformed by cutting off column and jacking based on stiffness ratio

[摘要] The cutting off column and jacking technology is a method for increasing story height, which has been widely used and paid much attention in engineering. The stiffness will be changed after the process of cutting off column and jacking, which directly affects the overall seismic performance. It is usually necessary to take seismic strengthening measures to enhance the stiffness. A five story frame structure jacking project in Jinan High-tech Zone was taken as an example, and three finite element models were established which contains the frame model before lifting, after lifting and after strengthening. Based on the stiffness, the dynamic time-history analysis was carried out to research its seismic performance under the EL-Centro seismic wave, the Taft seismic wave and the Tianjin artificial seismic wave. The research can provide some guidance for the design and construction of the entire jack lifting structure.

[发布机构] School of Architecture and Civil Engineering, University of Jinan, Jinan; 250022, China^1

[效力级别] 生态环境科学

[关键词] Artificial seismic wave;Cutting off columns;Design and construction;Dynamic time history analysis;Lifting structure;Seismic analysis;Seismic Performance;Seismic strengthening