Abstract
Severe damage, such as support failure, global buckling of members, local buckling of members, fracture of members, dislocation at the end of members, and failure of bolted connections, were observed in space double-layer lattice structures following the Lushan earthquake (China, 2013, M 7.0). To study the seismic behavior of the space double-layer lattice structure with a lower supporting structure, a series of shaking table tests were conducted. A nonlinear numerical analysis was performed on the damage of the structure, in which the material parameters were obtained from material tests of the steel member. The numerical results were compared with the experimental results, and the difference between the test and the numerical simulation was presented and discussed. The validity and accuracy of the proposed numerical model used for predicting the structural damage was verified by the experimental results, which indicates that the modeling and analytical method was applicable for the analysis of the space double-layer lattice structure.
Highlights
Space structures in the form of single- and doublelayer lattice shells are widely constructed throughout the world, especially in China
This kind of structure has become larger, higher, and much more complicated in recent years, which may lead to them being more sensitive to severe earthquakes and other dynamic loads
The final collapse pattern and ultimate bearing capacity using the link element are very different from the test results, which seriously overestimate the seismic performance of the actual space steel structure, so it is not suitable to use the link element for elasto-plastic analysis under severe earthquake conditions
Summary
Space structures in the form of single- and doublelayer lattice shells are widely constructed throughout the world, especially in China. This kind of structure has become larger, higher, and much more complicated in recent years, which may lead to them being more sensitive to severe earthquakes and other dynamic loads. Most of those structures are located in seismic areas with frequent severe earthquakes, which may cause property and economic losses, even resulting in casualties. Many researchers[1,2,3] focus on the dynamic instability since the structure is sensitive to changes in appearance, and the dynamic strength failure is observed.[4,5] The seismic performance of the space structure has been investigated using different numerical software[6,7,8,9] and some analytical methods, including the response spectrum method[10,11] and statistics of the responses.[12]
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