An earthquake safety evaluation computing device and computing method

Abstract

The invention discloses an earthquake safety evaluation calculation device, which is characterized in that it includes four modules: an earthquake risk calculation module, an earthquake motion synthesis module, a site calculation-1D module and a site calculation-2D module; the earthquake risk calculation The module includes five parts: basic parameters, potential source parameters, ground motion model, earthquake risk calculation and result input; the ground motion synthesis module includes five parts: control parameters, target spectrum, initial ground motion, ground motion synthesis and result output ; The site calculation-1D module and the site calculation-2D module both include four parts: calculation model, input earthquake motion, calculation and result output.

Description

technical field [0001] The invention relates to the technical field of earthquake engineering, in particular to an earthquake safety evaluation computing device and computing method. Background technique [0002] The site seismic safety evaluation work is based on the comprehensive evaluation of the site's regional seismic environment, including regional and near-field seismic geology and seismic activity, and local site seismic engineering geological conditions, through the development of seismic hazard calculations, ground motion Synthesis and calculation of site seismic response to determine site ground motion parameters and provide a basis for engineering anti-seismic fortifications. [0003] With the continuous increase in the breadth and depth of my country's engineering construction, the seismic environment and local site conditions for major projects and infrastructure construction are becoming more and more complex. For example, the long-span Nanjing Yangtze River F...

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Problems solved by technology

However, engineering practice and strong earthquake observation results show that the widely used one-dimensional equivalent linearization method has the following problems that need to be solved urgently: (1) The existing method uses the frequency-independent equivalent shear strain to determine the Dynamic shear modulus and damping ratio, this processing method will overestimate the peak acceleration (PGA) of the site response under large strain conditions, such as large earthquakes or soft and thick site conditions, on the other hand, due to the high frequency of earthquake motion If the amplitude of the component is low, this method will overestimate the strain of the high frequency component, thereby underestimating and overestimating the soil shear modulus and damping ratio corresponding to the high frequency component, resulting in a low value of the site transfer function in the high frequency band , during small earthquakes, the high-frequency component of the ground motion controls the PGA of the site response, so this method will underestimate the PGA of the site response during small earthquakes. This problem has been confirmed by theoretical analysis and actual observation data. Moreover, the actual engineering has repeatedly revealed the defects of this method under the conditions of large earthquakes and soft and thick sites; (2) The actual engineering site will show significant lateral inhomogeneity in some cases, while the commonly used one-dimensional method can only It is difficult to simulate high-dimensional sites such as 2D or 3D due to the vertical non-uniformity of the simulated site. This problem has become more and more prominent with the deepening of the seismic safety evaluation of major engineering sites. One-dimensional or three-dimensional site seismic response calculation program is an important technical issue that needs to be solved urgently; (3) The frequency-dependent equivalent linearization method can be applied to most of the strain ranges that need to be dealt with in actual engineering, but when dealing with some large The strain problem still has the inherent defects of the equivalent method itself. With the in-depth research on the soil dynamic constitutive relationship, there are currently several constitutive models that are convenient for engineering applications. The practical application of engineering provides the foundation, and the engineering practice of site seismic safety evaluation also puts forward a relatively urgent demand for the time-domain nonlinear calculation of complex site seismic response

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