CN111324951A - Intensity reduction coefficient spectrum model construction method and system - Google Patents
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Abstract
The invention discloses a method and a system for constructing an intensity reduction coefficient spectrum model. The method comprises the following steps: establishing an elastic single-degree-of-freedom structure model; calculating the lowest intensity; calculating the yield strength after the reduction; establishing a non-elastic single-degree-of-freedom structure model; calculating a displacement ductility coefficient; judging whether the displacement ductility coefficient meets a target ductility coefficient condition or not, and calculating an intensity reduction coefficient; constructing an intensity reduction coefficient spectrum; and (5) constructing an intensity reduction coefficient spectrum model through regression analysis. The method and the system effectively solve the problems that the strength reduction coefficient model provided at present is only based on the single earthquake action, and the further influence of the tsunami caused by the earthquake on the structural performance is ignored, and the like by considering the influence of the earthquake-tsunami continuous action on the structural stress performance, and provide important guarantee for the safety of the coastal structure under the earthquake-tsunami continuous action.
Description
Technical Field
The invention relates to the field of seismic engineering, in particular to a method and a system for constructing an intensity reduction coefficient spectrum model.
Background
From the history of earthquake-tsunami events, when a strong earthquake occurs at the deep sea bottom or near the sea, the movement of the crust causes the deformation of the plates on the sea bottom, the slippage occurs between the plates, and the seawater starts to move in a large scale to form tsunami. For example, in 2004, the indian ocean developed a submarine earthquake of grade 9.2, and a strong earthquake caused a huge tsunami, resulting in the destruction of the entire coastal area. The coastal structure is further subjected to the action of tsunami in a short time after the action of earthquake, and under the condition that the earthquake causes certain irreparable damage to the structure, the continuous action of tsunami can cause further additional damage to the structure, so that the structure is seriously damaged and even collapsed, and huge property loss and casualties are brought to coastal cities. However, the existing earthquake-proof design specifications in China and even the world only consider the stress performance of the structure under the action of an earthquake, and the research on the stress performance of the coastal structure under the continuous action of the earthquake and tsunami is still few.
The strength reduction coefficient can realize the earthquake-proof design of the structure based on inelastic earthquake force and can be combined with a capacity method to realize earthquake-proof evaluation of the structure based on property. Although different scholars propose a plurality of strength reduction coefficient models, the existing strength reduction coefficient models are all based on single earthquake action, and the further influence of the tsunami after the earthquake on the structural performance is ignored, so that the strength reduction coefficient model based on the earthquake-tsunami continuous action is constructed, and the method has important significance for the inelastic earthquake-proof design of coastal structures.
Disclosure of Invention
The invention provides a method and a system for constructing an intensity reduction coefficient spectrum model, which effectively solve the problem that the intensity reduction coefficient spectrum model provided at present is only based on the action of an individual earthquake, and ignores the further influence of tsunami caused by the earthquake on the structural performance.
In order to achieve the above object, the present invention provides the following solutions:
a method of intensity reduction coefficient spectral model construction, the method comprising:
establishing an elastic single-degree-of-freedom structure model according to the mass, the variation period and the damping ratio of the structure model;
calculating the lowest strength of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami under the condition of keeping elasticity;
calculating the yield strength after the reduction according to the lowest strength;
establishing a non-elastic single-degree-of-freedom structure model according to the reduced yield strength;
calculating a displacement ductility coefficient of the inelastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami;
judging whether the displacement ductility coefficient meets a target ductility coefficient condition;
if so, calculating a strength reduction coefficient according to the lowest strength and the reduced yield strength;
if not, reestablishing the inelastic single-degree-of-freedom structure model;
constructing an intensity reduction coefficient spectrum under the continuous action of earthquake and tsunami according to the intensity reduction coefficient;
and constructing an intensity reduction coefficient spectrum model under the continuous action of earthquake and tsunami according to the intensity reduction coefficient spectrum through regression analysis.
Optionally, the variation period of the elastic single-degree-of-freedom structure model is 0.1s to 6s, the interval is 0.1s, and the damping ratio is 0.02, 0.05, 0.1 or 0.2.
Optionally, the calculating of the lowest strength of the elastic single-degree-of-freedom structure model under the continuous action of the earthquake and tsunami for keeping elasticity specifically includes:
calculating the maximum displacement of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami;
and calculating the lowest intensity according to the maximum displacement of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami.
Optionally, the calculating the reduced yield strength according to the yield strength specifically includes:
and reducing the lowest strength to calculate the reduced yield strength.
Optionally, the calculating of the displacement ductility coefficient of the inelastic single-degree-of-freedom structure model under the continuous action of the earthquake and tsunami specifically includes:
calculating the maximum displacement of the inelastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami;
and calculating a displacement ductility coefficient according to the maximum displacement of the inelastic single-degree-of-freedom structure model under the continuous action of the earthquake and the tsunami.
An intensity reduction coefficient spectral model construction system, the system comprising:
the elastic single-degree-of-freedom structure model establishing module is used for establishing an elastic single-degree-of-freedom structure model according to the mass, the change period and the damping ratio of the structure model;
the minimum strength calculation module is used for calculating the minimum strength of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami for keeping elasticity;
the reduced yield strength calculation module is used for calculating the reduced yield strength according to the lowest strength;
the inelastic single-degree-of-freedom structure model establishing module is used for establishing an inelastic single-degree-of-freedom structure model according to the reduced yield strength;
the displacement ductility coefficient calculation module is used for calculating a displacement ductility coefficient of the inelastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami;
the judging module is used for judging whether the displacement ductility coefficient meets a target ductility coefficient condition or not;
the strength reduction coefficient calculation module is used for calculating a strength reduction coefficient according to the lowest strength and the reduced yield strength when the displacement ductility coefficient meets a target ductility coefficient condition;
the intensity reduction coefficient spectrum construction module is used for constructing an intensity reduction coefficient spectrum under the continuous action of earthquake and tsunami according to the intensity reduction coefficient;
and the intensity reduction coefficient spectrum model building module is used for building an intensity reduction coefficient spectrum model under the continuous action of earthquake and tsunami according to the intensity reduction coefficient spectrum through regression analysis.
Optionally, the minimum strength calculation module specifically includes:
the first displacement calculation unit is used for calculating the maximum displacement of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami;
and the minimum intensity calculating unit is used for calculating the minimum intensity according to the maximum displacement of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami.
Optionally, the reduced yield strength calculation module specifically includes:
and the reduced yield strength calculation unit is used for calculating the yield strength after the reduction according to the lowest strength and the actual yield strength of the inelastic single-degree-of-freedom structure model.
Optionally, the module for calculating a displacement ductility coefficient specifically includes:
the second displacement calculation unit is used for calculating the maximum displacement of the inelastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami;
and the displacement ductility coefficient calculation unit is used for calculating a displacement ductility coefficient according to the maximum displacement of the inelastic single-degree-of-freedom structure model under the continuous action of the earthquake and the tsunami.
Compared with the prior art, the invention discloses the following technical effects:
the invention establishes an elastic single-degree-of-freedom structure model and an inelastic single-degree-of-freedom structure model; calculating the lowest strength of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami under the condition of keeping elasticity; calculating the yield strength after the reduction; calculating the strength reduction coefficient under the continuous action of the earthquake and the tsunami according to the lowest strength and the reduced yield strength; constructing an intensity reduction coefficient spectrum under the continuous action of earthquake and tsunami according to the intensity reduction coefficient; and then constructing an intensity reduction coefficient spectrum model under the continuous action of earthquake and tsunami according to the intensity reduction coefficient spectrum. The intensity reduction coefficient spectrum model provided by the invention effectively solves the problems that the intensity reduction coefficient model provided at present is only based on the single earthquake action, and the further influence of the tsunami caused by the earthquake on the structural performance is neglected by considering the influence of the earthquake-tsunami continuous action on the structural stress performance, and the like, and provides an important guarantee for the safety of the coastal structure under the earthquake-tsunami continuous action. The method is very simple and convenient to use, a series of inelastic design spectrums with different ductility can be obtained by reducing the national standard elastic design spectrums by using the model according to the dynamic characteristics and the ductility requirements of the structure, and an important tool is provided for realizing the inelastic anti-seismic design of the coastal structure under the continuous action of earthquake and tsunami.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flowchart of a method for constructing an intensity reduction coefficient spectrum model according to an embodiment of the present invention;
fig. 2 is a block diagram of a system for constructing an intensity reduction coefficient spectrum model according to an embodiment of the present invention;
FIG. 3 is a diagram of a model of an elastic single-degree-of-freedom structure according to an embodiment of the present invention;
fig. 4 is a diagram of a model of a non-elastic single-degree-of-freedom mechanism according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method and a system for constructing an intensity reduction coefficient spectrum model, which effectively solve the problem that the currently proposed intensity reduction coefficient spectrum model is only based on the action of an individual earthquake and ignores the further influence of tsunami caused by the earthquake on the structural performance.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, a method for constructing an intensity reduction coefficient spectrum model includes the following steps:
101, establishing an elastic single-degree-of-freedom structure model through the mass, the change period and the damping ratio of the structure model, specifically setting the mass m of the model to be 1, the change period T to be 0.1 s-6 s, the interval to be 0.1s, the damping ratio ξ to be 0.02, 0.05, 0.1 or 0.2, and determining the dynamic characteristic of the elastic single-degree-of-freedom structure model, namely k0＝4mπ2/T2、ωn＝2π/T、c＝2mξωnWherein k is0As stiffness of the structure, omeganIs the natural frequency and c is the damping coefficient. The established elastic single-degree-of-freedom structure model is shown in figure 3.
Step 102: and calculating the lowest strength of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami under the condition of keeping elasticity. The method specifically comprises the following steps: calculating the maximum displacement of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami; and calculating the lowest strength according to the maximum displacement of the elastic single-degree-of-freedom structure model under the continuous action of the earthquake and the tsunami. Specifically, the maximum displacement u of the elastic single-degree-of-freedom structure model is calculated by using a structural basic dynamic equation and a central difference methodmax：
Wherein
In order to achieve a relative acceleration of the structure,
is the relative speed of the structure, fsWhich indicates the force of the restoring force of the structure,
is seismic acceleration.
Obtaining u by center difference methodmaxThe process comprises the following steps:
first, the relative acceleration and the relative speed of the structure are expressed by the central difference of the displacement:
wherein
Is the relative acceleration at the time i and,
is the relative velocity at time i.
Substituting formula (2) into formula (1) to obtain:
converting the formula (3) to obtain:
then u ismaxIs composed of
umax＝max(|ui+1|) (5)
Calculating the lowest strength F of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami for keeping elasticitye(μ＝1)＝k0umax。
Step 103: and calculating the yield strength after reduction according to the lowest strength. The method specifically comprises the following steps: and (4) reducing the lowest strength to calculate the yield strength after reduction. Specifically, according to the formula: fy＝Fe(mu-1) -n delta F, wherein delta F is the gradient of the difference value between the lowest strength of the elastic single-degree-of-freedom model and the reduced yield strength of the inelastic model, and n is the cycle number (the initial value is 1).
Step 104: and establishing a non-elastic single-degree-of-freedom structure model according to the reduced yield strength. The method specifically comprises the following steps: defining the rigidity k of the inelastic single-degree-of-freedom model, and when u is less than or equal to uy＝Fy/k0When k is equal to k0(ii) a When u > uy＝Fy/k0When k is α k0. Wherein u is the actual displacement under the continuous action of earthquake and tsunamiyFor structural yield displacement, FyFor practical yield strength, αIs the structural yield stiffness ratio. The established inelastic single degree-of-freedom structural model is shown in fig. 4.
Step 105: and calculating the displacement ductility coefficient of the inelastic single-degree-of-freedom structure model under the continuous action of the earthquake and the tsunami. The method specifically comprises the following steps: calculating the maximum displacement of the inelastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami; and calculating a displacement ductility coefficient according to the maximum displacement of the inelastic single-degree-of-freedom structure model under the continuous action of the earthquake and the tsunami. Specifically, the maximum displacement u of the inelastic single-degree-of-freedom structure model under the continuous action of the earthquake and tsunami is calculated by using a structural basic power equation and a center difference methodmaxUsing the formula mu ═ umax/uyCalculating the displacement ductility coefficient of the inelastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami, wherein mu is the structure displacement ductility coefficient, u is the structural displacement ductility coefficientmaxThe maximum displacement of the structure under the continuous action of earthquake and tsunami.
Step 106: and judging whether the displacement ductility coefficient meets the target ductility coefficient condition. If | (mu-mu)i)/μiAnd | is less than or equal to 0.01, wherein mu is the target ductility coefficient, executing the step 107, otherwise, returning to the step 105.
Step 107: and calculating the strength reduction coefficient of the inelastic single-degree-of-freedom structure model under the continuous action of the earthquake and the tsunami. The method specifically comprises the following steps: and calculating the strength reduction coefficient through the lowest strength and the yield strength after reduction. Specifically, according to the formula: rμ＝Fe(μ＝1)/Fy(μ＝μi) Calculating the strength reduction coefficient of the inelastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami, wherein RμTo reduce the coefficient of strength, Fe(μ ═ 1) for structure retention elasticity minimum strength, Fy(μ＝μi) Is the actual yield strength of the structure.
Step 108: and constructing an intensity reduction coefficient spectrum under the continuous action of the earthquake and the tsunami according to the intensity reduction coefficient. The specific process is as follows: grouping is performed according to the relative strength of the tsunami and the earthquake, the relative strength is expressed by the ratio of the tsunami acceleration to the earthquake peak acceleration, and the ratio is defined as 0, 0.25, 0.5, 0.75 and 1.0, wherein 0 represents that only earthquake action exists. And averaging the intensity reduction coefficient spectrums under the same group of relative intensities to obtain an average intensity reduction coefficient spectrum under the relative intensities corresponding to the tsunami and the earthquake.
Step 109: and constructing an intensity reduction coefficient spectrum model under the continuous action of earthquake and tsunami according to the intensity reduction coefficient spectrum through regression analysis. Specifically, according to the formula:
and constructing an intensity reduction coefficient spectrum model. Wherein T represents an equivalent single degree of freedom structure period, and a, b, c, d, e and f are fitting parameters related to the structure damping and yield stiffness. a, b, c, d, e and f are specifically according to the formula:
a(ξ,α)＝a1+a2·ξ+a3·ξ2+a4·α+a5·α2+a6·α3+a7·α4
b(ξ,α)＝b1+b2·ξ+b3·ξ2+b4·α+b5·α2+b6·α3+b7·α4
c(ξ,α)＝c1+c2·ξ+c3·ξ2+c4·α+c5·α2+c6·α3+c7·α4
d(ξ,α)＝d1+d2·ξ+d3·ξ2+d4·α+d5·α2+d6·α3+d7·α4
e(ξ,α)＝e1+e2·ξ+e3·ξ2+e4·α+e5·α2+e6·α3+e7·α4
f(ξ,α)＝f1+f2·ξ+f3·ξ2+f4·α+f5·α2+f6·α3+f7·α4
and (4) calculating. Wherein a isi，bi，ci，di，eiAnd fiSee tables 1 to 5 for fitting parameters, wherein:
table 1 shows the fitting parameters a without tsunamii，bi，ci，di，eiAnd fi(i-1-7); table 2 shows the fitting parameter a under the condition that the tsunami acceleration is 0.25i，bi，ci，di，eiAnd fi(i-1-7); table 3 shows the fitting parameter a under the condition that the tsunami acceleration is 0.5i，bi，ci，di，eiAnd fi(i-1-7); table 4 shows the fitting parameter a under the condition that the tsunami acceleration is 0.75i，bi，ci，di，eiAnd fi(i-1-7); table 5 shows the fitting parameter a under the condition that the tsunami acceleration is 1.0i，bi，ci，di，eiAnd fi(i-1-7).
TABLE 1
TABLE 2
TABLE 3
TABLE 4
TABLE 5
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention establishes an elastic single-degree-of-freedom structure model and an inelastic single-degree-of-freedom structure model; calculating the lowest strength of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami under the condition of keeping elasticity; calculating the yield strength after the reduction; calculating a strength reduction coefficient according to the lowest strength and the reduced yield strength; constructing an intensity reduction coefficient spectrum under the continuous action of earthquake and tsunami according to the intensity reduction coefficient; and then constructing an intensity reduction coefficient spectrum model under the continuous action of earthquake and tsunami according to the intensity reduction coefficient spectrum. The intensity reduction coefficient spectrum model provided by the invention effectively solves the problems that the intensity reduction coefficient model provided at present is only based on the single earthquake action, and the further influence of the tsunami caused by the earthquake on the structural performance is neglected by considering the influence of the earthquake-tsunami continuous action on the structural stress performance, and the like, and provides an important guarantee for the safety of the coastal structure under the earthquake-tsunami continuous action. The method is very simple and convenient to use, a series of inelastic design spectrums with different ductility can be obtained by reducing the national standard elastic design spectrums by using the model according to the dynamic characteristics and the ductility requirements of the structure, and an important tool is provided for realizing the inelastic anti-seismic design of the coastal structure under the continuous action of earthquake and tsunami.
As shown in fig. 2, the present invention further provides an intensity reduction coefficient spectrum model building system, which includes:
an elastic single-degree-of-freedom structure model establishing module 201, configured to establish an elastic single-degree-of-freedom structure model according to the mass, the variation period, and the damping ratio of the structure model;
and the minimum strength calculation module 202 is used for calculating the minimum strength of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami for keeping elasticity.
Wherein the minimum intensity calculation module 202 further comprises:
the first displacement calculation unit is used for calculating the maximum displacement of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami;
and the minimum intensity calculating unit is used for calculating the minimum intensity according to the maximum displacement of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami.
And a reduced yield strength calculation module 203 for calculating a reduced yield strength according to the lowest strength.
Wherein the reduced yield strength calculation module 203 further comprises:
and the reduced yield strength calculation unit is used for reducing the lowest strength to calculate the reduced yield strength.
The inelastic single-degree-of-freedom structure model establishing module 204 is used for establishing an inelastic single-degree-of-freedom structure model according to the reduced yield strength;
and the displacement ductility coefficient calculation module 205 is used for calculating the displacement ductility coefficient of the inelastic single-degree-of-freedom structure model under the continuous action of the earthquake and the tsunami.
Wherein the displacement ductility coefficient calculation module 205 further comprises:
the second displacement calculation unit is used for calculating the maximum displacement of the inelastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami;
a displacement ductility coefficient calculation unit for calculating a displacement ductility coefficient according to the maximum displacement of the inelastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami
A judging module 206, configured to judge whether the displacement ductility coefficient meets a target ductility coefficient condition;
the strength reduction coefficient calculation module 207 is used for calculating a strength reduction coefficient according to the lowest strength and the reduced yield strength when the displacement ductility coefficient meets the target ductility coefficient condition;
an intensity reduction coefficient spectrum construction module 208, configured to construct an intensity reduction coefficient spectrum according to the intensity reduction coefficient;
and the intensity reduction coefficient spectrum model building module 209 is used for building an intensity reduction coefficient spectrum model under the continuous action of the earthquake and the tsunami according to the intensity reduction coefficient spectrum through regression analysis.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A method for constructing an intensity reduction coefficient spectrum model is characterized by comprising the following steps:
establishing an elastic single-degree-of-freedom structure model according to the mass, the variation period and the damping ratio of the structure model;
calculating the lowest strength of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami under the condition of keeping elasticity;
calculating the yield strength after the reduction according to the lowest strength;
establishing a non-elastic single-degree-of-freedom structure model according to the reduced yield strength;
calculating a displacement ductility coefficient of the inelastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami;
judging whether the displacement ductility coefficient meets a target ductility coefficient condition;
if so, calculating a strength reduction coefficient according to the lowest strength and the reduced yield strength;
if not, reestablishing the inelastic single-degree-of-freedom structure model;
constructing an intensity reduction coefficient spectrum under the continuous action of earthquake and tsunami according to the intensity reduction coefficient;
and constructing an intensity reduction coefficient spectrum model under the continuous action of earthquake and tsunami according to the intensity reduction coefficient spectrum through regression analysis.
2. The intensity reduction coefficient spectrum model construction method according to claim 1, characterized in that:
the change period of the elastic single-degree-of-freedom structure model is 0.1 s-6 s, the interval is 0.1s, and the damping ratio is 0.02, 0.05, 0.1 or 0.2.
3. The method for constructing an intensity reduction coefficient spectrum model according to claim 1, wherein the calculating of the lowest intensity of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami for maintaining elasticity specifically comprises:
calculating the maximum displacement of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami;
and calculating the lowest intensity according to the maximum displacement of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami.
4. The method for constructing an intensity reduction coefficient spectrum model according to claim 1, wherein the calculating the reduced yield strength according to the minimum intensity specifically comprises:
and reducing the lowest strength to calculate the reduced yield strength.
5. The method for constructing an intensity reduction coefficient spectrum model according to claim 1, wherein the calculating of the displacement ductility coefficient of the inelastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami specifically comprises:
calculating the maximum displacement of the inelastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami;
and calculating a displacement ductility coefficient according to the maximum displacement of the inelastic single-degree-of-freedom structure model under the continuous action of the earthquake and the tsunami.
6. An intensity reduction coefficient spectral model construction system, the system comprising:
the elastic single-degree-of-freedom structure model establishing module is used for establishing an elastic single-degree-of-freedom structure model according to the mass, the change period and the damping ratio of the structure model;
the minimum strength calculation module is used for calculating the minimum strength of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami for keeping elasticity;
the reduced yield strength calculation module is used for calculating the reduced yield strength according to the lowest strength;
the inelastic single-degree-of-freedom structure model establishing module is used for establishing an inelastic single-degree-of-freedom structure model according to the reduced yield strength;
the displacement ductility coefficient calculation module is used for calculating a displacement ductility coefficient of the inelastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami;
the judging module is used for judging whether the displacement ductility coefficient meets a target ductility coefficient condition or not;
the strength reduction coefficient calculation module is used for calculating a strength reduction coefficient according to the lowest strength and the reduced yield strength when the displacement ductility coefficient meets a target ductility coefficient condition;
the intensity reduction coefficient spectrum construction module is used for constructing an intensity reduction coefficient spectrum under the continuous action of earthquake and tsunami according to the intensity reduction coefficient;
and the intensity reduction coefficient spectrum model building module is used for building an intensity reduction coefficient spectrum model under the continuous action of earthquake and tsunami according to the intensity reduction coefficient spectrum through regression analysis.
7. The intensity reduction coefficient spectrum model building system according to claim 6, wherein the lowest intensity calculating module specifically comprises:
the first displacement calculation unit is used for calculating the maximum displacement of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami;
and the minimum intensity calculating unit is used for calculating the minimum intensity according to the maximum displacement of the elastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami.
8. The intensity reduction coefficient spectrum model building system according to claim 6, wherein the reduction yield strength calculation module specifically comprises:
and the reduced yield strength calculation unit is used for reducing the lowest strength to calculate the reduced yield strength.
9. The intensity reduction coefficient spectrum model construction system according to claim 6, wherein the displacement ductility coefficient calculation module specifically comprises:
the second displacement calculation unit is used for calculating the maximum displacement of the inelastic single-degree-of-freedom structure model under the continuous action of earthquake and tsunami;
and the displacement ductility coefficient calculation unit is used for calculating a displacement ductility coefficient according to the maximum displacement of the inelastic single-degree-of-freedom structure model under the continuous action of the earthquake and the tsunami.
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