Whole process test and dynamic failure analysis for single-layer spherical lattice shells

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (1) : 31-37.

BA Panfeng, ZHANG Yigang, WU Jinzhi, ZHANG Zhihao, ZHENG Xiujuan

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Abstract

In order to study deeply the dynamic failure process of single-layer spherical lattice shells, combining with shaking table tests of a K6 type single-layer spherical lattice shell, a set of vibration test methods describing the whole collapses process of singlelayer spherical shells under strong earthquakes was designed. It included the impact method measuring natural vibration characteristics of structures, the low frequency amplitudemodulation loading assessing structural damage level, and the fundamental frequency simple harmonic loading monitoring structural failure process. Based on the data results of measurement, the collapse process's deformation history of a structure was described. The fundamental frequency, damping and modal shapes of a structure were analyzed. The order of bars of a structure to enter a plastic state was recorded. The rules of structural damage evolution and collapse failure mechanism were explored. At last, considering material damage, the whole failure process of signle-layer spherical lattice shells was simulated with the FE method. Comparing with the test results, the correctness of the simulation method was verified.

Key words

shaking table test / deformation history / natural vibration characteristics / damage assessment / the whole failure process

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BA Panfeng, ZHANG Yigang, WU Jinzhi, ZHANG Zhihao, ZHENG Xiujuan. Whole process test and dynamic failure analysis for single-layer spherical lattice shells[J]. Journal of Vibration and Shock, 2017, 36(1): 31-37

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