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Floor acceleration amplification and response spectra of reinforced concrete frame structure based on shaking table tests and numerical study

Zou Xiaoguang, Yang Weiguo, Liu Pei, Wang Meng

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 3

art. no. e156, 2023

In the seismic design of acceleration-sensitive nonstructural components, floor acceleration response spectra are commonly selected for analysis, which has proven to be effective in practice. To accurately study the floor acceleration response spectrum of a reinforced concrete structure under earthquakes, a 3-story reinforced concrete frame structure designed based on Chinese codes was built and placed on a shaking table for testing to obtain actual floor acceleration response for investigation of spectral characteristics. In addition, a set of finite element models of reinforced concrete frame buildings were analyzed to better study the variation of floor acceleration peaks and response spectra with different modal periods. The results show that floor dynamic magnification is highly related to structural dynamic characteristics and building’s relative height. Obvious peaks are observed in the floor response spectrum, which correspond to the structural modal periods. The values of the spectra, particularly the peaks, show a strong correlation with the floor level and the damping ratios of nonstructural components. Based on the observations gained from shaking table tests and numerical study, a function for predicting the floor dynamic magnification factor and a method for generating the spectral amplification factor of the floor are proposed. Then the findings acquired from the test, numerical study, and existing methods were applied for the validation of the proposed methods. It is shown that the proposed floor dynamic magnification factor prediction function and spectral amplification factor prediction method are useful for the seismic design of nonstructural components in various reinforced concrete structures, taking into account the structural dynamic characteristics, the floor level, and the damping ratio of nonstructural components.

Collapse of the single layered cylinder shell with model experimental study

Nie Gui-bo, Zhang Chen-xiao, Zhi Xu-dong, Dai Jun-wu

Archives of Civil and Mechanical Engineering

2019

Vol. 19, no. 3

883--897

With the rapid development of the large-span space structure, it has been widely used in the public buildings such as gymnasiums, exhibition hall, airplane terminal, etc. in China recently. The large-span latticed shell buildings are usually the landmark buildings in a city, so its collapse will cause serious economic and personal loss, which will affect national security and social stability. The shaking table test was conducted on the single layered cylinder shell model in this paper, and the dynamic amplification effects of the lower support frame and the dynamic responses of the whole model were obtained under different seismic motion inputs. The seismic performance of the single layered cylinder shell was evaluated under different ground motion inputs and input principal directions, and the collapse mode was obtained. The results show that the input principal direction has great effect on the dynamic characteristics of the model, and the dynamic amplification effect of the lower support frame increases with the magnitude increase of the ground motion inputs. There is no obvious impact effect and the dynamic strain responses behave elastic during the collapse process, and the whole shell collapse because of local instability. It concludes that the single layered cylinder shell has the risk of progressive collapse under the seismic motions, so the collapse resistance of single layered cylinder shell should be enhanced or it should be optimum designed to prevent the progressive collapse. This experimental study will provide references to the seismic design and engineering practices.