HOU Shiwei,GAO Guangliang,ZHANG Hao,et al.Influence of Screw Anchor Composite Foundation on Seismic Performance of Rural Raw Earth Buildings[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(04):778-786.
HOU Shiwei,GAO Guangliang,ZHANG Hao,et al.Influence of Screw Anchor Composite Foundation on Seismic Performance of Rural Raw Earth Buildings[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(04):778-786. DOI: 10.13409/j.cnki.jdpme.20211028001.
Influence of Screw Anchor Composite Foundation on Seismic Performance of Rural Raw Earth Buildings
The soil structure of towns is seriously damaged in earthquakes because of its insufficient seismic capacity, and the screw anchor foundation can provide anti-pullout force to prevent the building from uplifting and overturning. According to the influence factors of the buried depth, spacing and screw anchor plates number on the uplift bearing characteristics and ultimate uplift bearing capacity of the screw anchor in sand, the parameters of the screw anchor composite foundation are determined by comparison and optimization. Taking the typical single-layer raw earth structure in Chinese villages and towns as the research object, the seismic response of the strip foundation raw earth structure and the screw anchor composite foundation raw earth structure are analyzed, so as to study the seismic structural reinforcement measures suitable for rural raw earth structure. Based on the nonlinear dynamic time history analysis method, the top displacement of the structure is extracted, and the influence of screw anchor composite foundation on the seismic response of raw earth structure is studied. The results show that: (1) When the buried depth ratio is 10.5 and the distance between anchor plates is 4.5D, the uplift bearing characteristics of double screw anchors are the best; (2) Under the action of ground motion, the form of the screw anchor composite foundation affects the overall seismic performance of the structure to a certain extent. The screw anchor composite foundation significantly improves the seismic performance of raw earth buildings; (3) The maximum axial force of screw anchor composite foundation under the ground motion does not reach its ultimate uplift bearing capacity, and the foundation is solid and reliable; (4) Under earthquake action, the damage grade of raw earth structure is reduced and the performance level of structure is improved.
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