What is the impact of earthquake on large-scale urban sculptures? No matter what external and irresistible factors will affect the life of sculptures. The principle of determining the reasonable number of vibration modes is an unavoidable problem when calculating the earthquake effect. In order to ensure that the impact of losing higher-order vibration modes is not affected and the seismic safety of the structure is ensured, how to determine the reasonable number of vibration modes required by the structure is an unavoidable problem. Hainan Sculpture
Especially for irregular structures, high-order modes will have a greater impact on the structure.
(1) The quality participation coefficient method, Code for Seismic Design of Buildings GB50011-2010, states as follows: "In order to improve the analysis accuracy of high flexible buildings, the number of combined vibration modes can be appropriately increased. The number of vibration modes can generally be taken as the number of vibration modes required for the vibration mode participation quality to reach 90% of the total mass."
(2) Cycle ratio control In order to control the potential destructive force of structural torsional effect, the code stipulates the upper limit of structural torsional response, that is, the ratio of one cycle T dominated by torsion to one cycle T1 dominated by translation. For buildings of Class A height, it should not be greater than 0.9, and for buildings of Class B height, high-rise buildings with hybrid structures and complex high-rise buildings, it should not be greater than 0.85.
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The seismic action of urban landscape sculpture has a great relationship with the structural safety. Analysis of the dynamic characteristics of the statue structure According to the seismic data, there are about 5 million recordable earthquakes every year in the world, including nearly 1000 felt earthquakes that cause damage, and more than 10 strong earthquakes of magnitude 7 or above that can cause heavy damage every year.
Seismic action has a great impact on structural safety, and high-rise buildings have a particularly strong response to earthquakes, because with the increasing height of buildings, the impact of horizontal loads on the structure is also growing. Hainan Sculpture
For example, the bronze colossus of Apollo, built in 282 BC, is located at the population of Rhodes Island Port in Greece. The white marble base of the colossus is hollow, and the body is made of bronze stars. It is 3m high. A strong earthquake in 225 BC caused extremely serious damage to the statue, and the weakest part was shattered, The failure to repair earthquakes in the future is closely related to the dynamic characteristics of the structure itself, and the changes in the quality and stiffness of the structure will directly affect the strength of the earthquake action. Hainan Sculpture
Therefore, the specification requires that the plane and elevation of the building should be arranged as reasonably as possible during design. However, for the large-scale statue structure, because the irregular shape cannot be changed artificially, the center of gravity and the center of mass often deviate seriously, and the height width ratio is far larger than that of high-rise buildings, so its dynamic characteristics are also very different from high-rise buildings. Therefore, this chapter, based on the characteristics of this type of structure, takes the Thousand Hand Avalokitesvara Project in Changsha as an example to introduce how to meet the requirements of the specifications, The dynamic performance of large statue structure with super high aspect ratio is calculated and analyzed by using the response spectrum method of vibration mode decomposition and time history analysis method
