Anti-seismic safety assessment method of fortification-exceeding intensity earthquake of engineering structure
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A technology of fortification intensity and engineering structure, which is applied in the direction of earthquake resistance and building components to achieve the effect of improving safety
Active Publication Date: 2013-03-13
QINGDAO TECHNOLOGICAL UNIVERSITY
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There is no mature method for reference in the world for the seismic safety assessment method under the super-fortification intensity...
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[0015] (1) Give the ground motion levels of frequent intensity, basic intensity, rare intensity and super-prevention intensity of the project site.
[0016] (2) Delineate the displacement or displacement angle levels of frequent intensity and rare intensity.
[0017] (3) By static pushover analysis (POSHOVER) or incremental dynamic analysis (IDA) to trace the whole process of the structure from elasticity, plasticity, and failure, obtain the frequent intensity, basic intensity, rare intensity and super-fortification intensity Structural behavior parameters (such as displacement and ductility coefficients, etc.), according to the corresponding elastic and plastic structural behavior parameters (ductility coefficients), are converted into corresponding equivalent damping ratios (or other parameters that can reduce earthquake motion), and the structural collapse can be determined displacement or displacement angle level.
[0018] (4) Make the ground motions of common intensity, ...
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Abstract
The invention provides an anti-seismic safety assessment method of a fortification-exceeding intensity earthquake of an engineering structure, and the method is characterized by comprising the following steps of (1) giving an earthquake level of frequently-occurred intensity, basic intensity, rare intensity and fortification-exceeding intensity in the place where the project is located; (2) demarcating the displacement or the displacement angular benchmark of the frequently-occurred intensity and the rare intensity; (3) matching the seismic oscillation of the frequently-occurred intensity, the basic intensity, the rare intensity and the fortification-exceeding intensity with the structure behavior through a static push-over analysis method or an increment power analysis method; and (4) drawing a structural capacity curve and a seismic oscillation curve, and judging whether the dual-control performance of the force and the displacement meets the requirement or not. The method has the beneficial effects that design evaluation is carried out for the uncertainty of the set fortification intensity, the safety, robustness and collapse resistance of the engineering structure can be improved, and no mature method can be referred especially for the anti-seismic safety assessment method in the international market.
Description
technical field [0001] The invention relates to an anti-seismic safety evaluation method, in particular to an anti-seismic safety evaluation method for engineering structures in earthquakes exceeding the fortification intensity. Background technique [0002] In the past 50 years, one of the remarkable characteristics of earthquakes in the world is that they are large in intensity and damage beyond fortification intensity, such as Tangshan (China, 1976), Prieta (USA, 1989), Northridge (USA, 1994), Kobe (Japan, 1995), Izmit (Turkey, 1999), Jiji (Taiwan, 1999), Bhuj—Ahmadabad-Rajkot (India, 2001), Algiers—Bourmerdes—Thenia (Algeria, 2003), Bani (Iran, 2003), Sumatra—Andaman (Indonesia, 2004) ), Kashmir South Asia (Pakistan and India, 2005), Yogyakarta (Indonesia, 2006), Peru (Peru, 2007), Wenchuan (China, 2008), Port-au-Prince (Haiti, 2010), Concepcion (Chile, 2010 ), Yushu (China, 2010), Miyagi Prefecture (Japan, 2011) and other earthquakes. These earthquakes obviously excee...
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