DYNAMIC ANALYSIS OF MULTI-LOOP CABLE-STRING DOME DUE TO SUDDEN CABLE FAILURE

The multi-loop cable-string dome (MLSD) is a complex suspended-dome structure. Sudden failure of any cables will cause a very significant dynamic impact on MLSD. Based on the AP method, this study proposes a dynamic analysis method to analyze the dynamic response of MLSD due to sudden cable broken. The sensitive analysis of different parameters was conducted, such as failure paths, failure time, damping ratio and initial loadings. The ideal parameters suitable for MLSD are recommended. The dynamic analysis results show that: the displacement and internal force response of the remaining MLSD due to cable sudden broken will be greater than the cable slowly failure. The dynamic amplification factor should be seriously considered when suffered from cable sudden broken. Moreover, the dynamic amplification factor (DAF) of some responses will be larger than 2.0 recommended by current design codes. The discussion on displacement DAFs due to different cables sudden broken shows that the DAFs due to the sudden failure of any cables of the same loop are the same. The DAFs caused by sudden failure of cables on the outer loop will be significantly greater than that of other loops. Both DAFs due to cable failure of the outer loop and the string are significant, but the DAFs value distribution are quite different. The dynamic response caused by multiple cable breakages is not always greater than that of a single cable.