CN115795599A - Civil defense engineering structure earthquake vulnerability assessment method - Google Patents
Civil defense engineering structure earthquake vulnerability assessment method Download PDFInfo
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Abstract
The application relates to the field of civil defense engineering structure earthquake-resistant risks, and provides a civil defense engineering structure earthquake vulnerability assessment method, which comprises the following steps: (1) Determining the mechanical characteristics and site characteristics of a representative civil defense engineering structure; (2) reasonably selecting and analyzing seismic oscillation; (3) Establishing a soil-civil defense engineering structure interaction nonlinear numerical calculation model; (4) Adopting peak velocity and interlayer displacement angle as seismic intensity parameter and civil defense engineering structure performance parameter; (5) Establishing a civil defense engineering structure earthquake-resistant probability demand model, and obtaining the mean value and logarithmic standard deviation of the civil defense engineering structure vulnerability function; (6) And (5) obtaining a seismic vulnerability curve of the civil defense engineering structure based on the mean value and the logarithmic standard deviation in the step (5). The scheme that this application provided, its beneficial effect lies in: the civil defense engineering structure vulnerability quantitative evaluation method based on the dynamic conditions can accurately evaluate the civil defense engineering structure performance and the vulnerability under the earthquake load.
Description
Technical Field
The application relates to the field of civil defense engineering structure earthquake-resistant risk assessment, in particular to a method for assessing earthquake vulnerability of a civil defense engineering structure.
Background
The city civil defense engineering structure is the 'lifeline' engineering of modern cities, and plays an extremely important role in ensuring the normal operation of the cities. Once the facilities are destroyed in the earthquake, the system service is interrupted, and the function of the whole city is damaged or even paralyzed seriously. In the field of civil defense engineering structures, the seismic design and safety assessment of the civil defense engineering structures are usually developed by a qualitative expert investigation method and a pseudo-static method, and the influence of specific engineering conditions and multiple uncertain factors on the seismic vulnerability of the civil defense engineering structures is difficult to consider.
The earthquake vulnerability assessment is a key component in earthquake risk analysis of the civil defense engineering structure, the method can reasonably express the exceeding probability of different levels of damage of the structure under different earthquake intensities, and relevant researches have important theoretical significance and engineering practical value on civil defense engineering structure earthquake-resistant optimization design, daily earthquake-resistant maintenance, post-disaster recovery strategies and the like. However, at present, there are two main types of traditional civil defense engineering structure earthquake vulnerability analysis: seismic vulnerability analysis based on empirical methods and seismic vulnerability analysis based on numerical methods. The first method relies on the earthquake and earthquake damage statistical data of the actual civil defense engineering structure and combines an expert experience method to carry out vulnerability analysis, and the method cannot consider the specific information of a specific working condition and truly reflect the vulnerability state of the structure; and the second vulnerability analysis based on a numerical method can reasonably consider the influence of the characteristics of the civil defense engineering structure, and the subsequent vulnerability analysis is carried out through a large amount of numerical calculation, so that the result is more accurate. However, in the field of civil defense engineering structure earthquake vulnerability analysis, the existing research usually adopts an earthquake vulnerability analysis method based on an empirical method, and the influence of multiple uncertainty factors of a soil body-civil defense engineering structure cannot be considered, so that a reasonable and accurate civil defense engineering structure earthquake vulnerability analysis result is difficult to obtain.
The civil defense engineering structure is one of key components of an urban lifeline system, and important hidden dangers are brought to urban safety in view of the fact that the past earthquake-resistant performance evaluation methods mostly depend on qualitative methods and cannot accurately evaluate the earthquake-resistant performance of the civil defense engineering structure. Therefore, the method for reasonably and accurately evaluating the earthquake vulnerability of the civil defense engineering structure has important significance for guiding optimization design and post-earthquake structure repair strategy selection.
Disclosure of Invention
The purpose of this application lies in: the method can consider the characteristics of a real soil body-civil defense engineering structure and multiple uncertainty influences, has accurate evaluation results, and can reasonably and quantitatively evaluate the vulnerability of the civil defense engineering structure under earthquakes with different intensities.
In order to achieve the above object, the present application provides the following technical solutions:
the civil defense engineering structure earthquake vulnerability assessment method is characterized by comprising the following six steps:
(1) Selecting an actual representative civil defense engineering structure, determining the scale parameters and the material mechanics parameters of the engineering structure, and acquiring the geotechnical characteristic parameters of the civil defense engineering structure field.
(2) According to the field conditions of civil defense engineering structures, a series of earthquake motion meeting the field conditions is selected to be acceleration time-course samples.
(3) And establishing a dynamic time-course analysis model considering the interaction of the soil body-civil defense engineering structure based on the obtained structural mechanical characteristic parameters, the rock-soil mechanical parameters and the selected seismic oscillation.
(4) Response characteristics of a soil-civil defense engineering structure system are obtained through a large amount of dynamic time course analysis, and earth surface peak velocity (PGV) and interlayer displacement angle (delta) are selected as seismic intensity parameters and civil defense engineering structure performance parameters.
Furthermore, the civil defense engineering structure performance parameter is an interlayer displacement angle (delta) defined as the ratio of different layer horizontal displacements (K) and layer heights (h) of different civil defense engineering structures. The horizontal displacement (K) of different layers can be obtained by calculation through a nonlinear numerical model, and the layer height (h) is the real height of different layers of the civil defense engineering structure. Different damage levels of civil defense engineering structure performance parameters can be divided into five levels, including: 1) Substantially intact; 2) Slight damage; 3) Moderate destruction;
4) Severe damage; 5) Collapse; the five different damage levels are shown in table 1:
TABLE 1 civil defense engineering structure interlaminar displacement angle (delta) and damage grade
(5) And constructing a civil defense engineering structure earthquake probability demand model based on the selected earthquake intensity parameters and civil defense engineering structure performance parameters, and obtaining the civil defense engineering structure vulnerability curve parameters corresponding to different damage states according to the structure deformation limit values corresponding to different damage states, namely the earthquake intensity median parameter IM and the logarithm standard deviation beta. The relationship between the structural performance parameter δ and the seismic intensity parameter IM in the seismic demand model can be represented by the following formula:
In(δ)＝In(m)+qIn(IM)
the parameters m and q in the above formula can be obtained by data fitting regression.
The logarithmic standard deviation beta expresses the deviation degree between the structural performance parameters obtained by an actual numerical method and the predicted value of the fitted earthquake probability demand model, and can be calculated by the following formula:
in the above formula, β represents the logarithmic standard deviation, δ, of the probabilistic seismic demand model at a given seismic intensity parameter IM i And inputting the maximum value of the displacement angle between civil defense engineering structural layers under seismic excitation for the ith input seismic excitation, wherein n is the total seismic excitation.
(6) The exceeding probability of civil defense engineering structure earthquake requirements can be further calculated based on the calculated earthquake intensity median parameter IM and the logarithm standard deviation beta, and further a civil defense engineering structure earthquake vulnerability curve is established, wherein the calculation formula of the earthquake vulnerability curve is as follows:
P[ds>ds i |IM]＝Φ(IM/β)
wherein P is f (. Cndot.) is the probability of exceeding a certain failure state ds, IM is for a given seismic intensity level defined by the seismic parameters, Φ is the standard normal density cumulative probability function, IM j Is the median value, β, corresponding to the state that leads to the jth failure j Is the log standard deviation, expressing the variability of the vulnerability curve.
Compared with the prior art, the technical scheme provided by the application is taken as an example and is not limited, and the invention has the following advantages that:
(1) The traditional method relies on real earthquake damage data, the evaluation structure is subjective and qualitative, the method can give a prepared and reliable civil defense engineering structure vulnerability evaluation result in a quantitative mode, and the method has important guiding significance on the earthquake risk evaluation of the structure;
(2) The traditional method cannot consider the real site characteristics of the civil defense engineering structure, the selected structural material parameters are single, the method can consider the geotechnical parameter characteristics of the real site and the complex material characteristics of the civil defense engineering structure, and can reasonably reflect the complex scale characteristics of the civil defense engineering structure;
(3) The method can reasonably consider the influence of complex uncertainty factors on the dynamic mechanical response of civil defense engineering structures, such as uncertainty of soil body mechanical parameters, uncertainty of input seismic waves, uncertainty of structure dimensions and the like.
Drawings
Fig. 1 is a technical flowchart of an evaluation method provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a soil-civil defense engineering position in step (1) in the evaluation method provided in the embodiment of the present application;
FIG. 3 is a schematic diagram illustrating the selective vibration in step (1) of the evaluation method provided in the embodiment of the present application;
fig. 4 is a seismic probability demand model of a representative civil defense engineering structure in step (5) in the evaluation method provided in the embodiment of the present application;
fig. 5 is a seismic vulnerability curve of a representative civil defense engineering structure in step (6) in the evaluation method provided in the embodiment of the present application.
Detailed Description
The technical solutions provided in the present application will be further described with reference to the following specific embodiments and accompanying drawings. The advantages and features of the present application will become apparent from the following description.
It should be noted that the embodiments of the present application have a better implementation and are not intended to limit the present application in any way. The technical features or combinations of the technical features described in the embodiments of the present application should not be considered as being isolated, and they may be combined with each other to achieve a better technical effect. The scope of the preferred embodiments of this application may also include additional implementations, and this should be understood by those skilled in the art to which the embodiments of this application pertain.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
The drawings in the present application are in simplified form and are not to scale, but rather are provided for convenience and clarity in describing the embodiments of the present application and are not intended to limit the scope of the application. Modifications of the structure, changes of the proportion or adjustment of the size should fall within the scope of the technical content disclosed in the present application without affecting the effect and the purpose achieved by the present application. And the same reference numbers appearing in the various drawings of the present application designate the same features or components, which may be employed in different embodiments.
As shown in FIG. 1, the civil defense engineering structure earthquake vulnerability assessment method comprises six steps:
(1) Selecting an actual representative civil defense engineering structure, determining a scale parameter and a material mechanics parameter of the engineering structure, and acquiring a geotechnical characteristic parameter of a field of the civil defense engineering structure;
(2) Selecting a series of earthquake motion meeting the field condition as acceleration time-course samples according to the field condition of the civil defense engineering structure;
(3) Establishing a dynamic time-course analysis model considering the interaction of the soil body-civil defense engineering structure based on the obtained structural mechanical characteristic parameters, the rock-soil mechanical parameters and the selected seismic oscillation;
(4) Obtaining the response characteristics of a soil-civil defense engineering structure system through a large amount of dynamic time course analysis, and selecting a surface peak velocity (PGV) and an interlayer displacement angle (delta) as a seismic intensity parameter and a civil defense engineering structure performance parameter;
(5) And constructing a civil defense engineering structure earthquake probability demand model based on the selected earthquake intensity parameters and civil defense engineering structure performance parameters, and obtaining the civil defense engineering structure vulnerability curve parameters corresponding to different damage states according to the structure deformation limit values corresponding to different damage states, namely the earthquake intensity median parameter IM and the logarithm standard deviation beta. The relationship between the structural performance parameter δ and the seismic intensity parameter IM in the seismic demand model can be represented by the following formula:
In(δ)＝In(m)+qIn(IM)
the parameters m and q in the above formula can be obtained by data fitting regression.
(6) The exceeding probability of civil defense engineering structure earthquake requirements can be further calculated based on the calculated earthquake intensity median parameter IM and the logarithm standard deviation beta, and further a civil defense engineering structure earthquake vulnerability curve is established, wherein the calculation formula of the earthquake vulnerability curve is as follows:
P[ds>ds i |IM]＝Φ(IM/β)
wherein P is f (. H) is the probability of exceeding a certain failure state ds, IM is the probability function for a given seismic intensity level defined by the seismic parameters,. Phi. j Is the median value, β, corresponding to the state that leads to the jth failure j Is the log standard deviation, expressing the variability of the vulnerability curve.
The application provides a civil defense engineering structure earthquake vulnerability assessment method, which is specifically shown in the attached figure 1, and the working flow is as follows:
the embodiment is as follows: the top of a civil defense engineering structure is 2m away from the earth surface, 2 layers of the civil defense engineering structure are 5 spans, the height of a structural layer is 3m, the width of a single span is 6m, the thickness of a floor slab and the thickness of a side wall are 0.4m, the elastic modulus and the Poisson ratio of structural concrete are 3.45Gpa and 0.2 respectively, and the elastic modulus and the Poisson ratio of reinforcing steel bars are 200GPa and 0.2 respectively. The civil defense engineering structure is a representative soft soil field civil defense engineering structure in a soft soil area, as shown in the attached figure 2.
A large number of random seismic motion acceleration time-course curve samples are selected from a seismic motion database according to a seismic disaster risk curve of a site where an actual civil defense project is located, and are shown in an attached figure 3.
And establishing a soil body-civil defense engineering structure dynamic nonlinear numerical analysis model based on the geometrical characteristics, the structural material characteristics, the selected input seismic oscillation and the boundary conditions of the actual civil defense engineering.
Response characteristics of a soil-civil defense engineering structure system are obtained through a large amount of dynamic time course analysis, and earth surface peak velocity (PGV) and interlayer displacement angle (delta) are selected as seismic intensity parameters and civil defense engineering structure performance parameters.
Through a large number of numerical analysis and calculation, civil defense engineering structure performance responses under different vibration intensities can be obtained, a large number of data sets of seismic intensity parameters IM and structural performance parameters delta are obtained, a civil defense engineering structure earthquake probability demand model can be constructed through the data sets, and a fitting formula is shown in an attached figure 4. And acquiring civil defense engineering structure vulnerability curve parameters corresponding to different damage states according to the structural deformation limit values corresponding to different damage states, namely a seismic intensity median parameter IM and a logarithmic standard deviation beta. Wherein, the logarithmic standard deviation β can be calculated by the following formula:
in the above formula, β represents the logarithmic standard deviation, δ, of the probabilistic seismic demand model at a given seismic intensity parameter IM i And inputting the maximum value of the displacement angle between civil defense engineering structural layers under seismic excitation for the ith input seismic excitation, wherein n is the total seismic excitation.
The destruction probability of civil defense engineering structure earthquake requirements can be calculated through the obtained earthquake intensity median parameter IM and the logarithm standard deviation beta, a civil defense engineering structure earthquake vulnerability curve is established, and the calculation formula is as follows:
P[ds>ds i |IM]＝Φ(IM/β)
wherein P is f (. Cndot.) is the probability of exceeding a certain failure state ds, IM is for a given seismic intensity level defined by seismic parameters, Φ is the standard normal density cumulative probability function, β is the logarithmic standard deviation, reflecting the effect of the complex uncertainty of the vulnerability curve establishment process.
By adopting the method, the earthquake vulnerability curve of the civil defense engineering structure is obtained, and particularly as shown in the attached figure 5, the earthquake-resistant risk assessment can be carried out on the representative civil defense engineering structure based on the curve. The evaluation result shows that the civil defense engineering structure is relatively safe under the condition of small earthquake dynamic intensity (for example, PGV is 0.3m/s or 0.4 m/s), and basically does not have obvious damage; however, under high-intensity earthquake motion, various types of damage conditions of the civil defense engineering structure can occur, and the calculation result shows that when the local vibration intensity parameter PGV is 1.0m/s, the probability of slight damage, medium damage and serious damage of the civil defense engineering structure can reach 92%, 67% and 18% respectively. The analysis shows that the established earthquake vulnerability curve can be used for reasonably and quantitatively evaluating the earthquake risk of civil defense engineering structures, and in order to prevent damage and damage conditions under high-intensity earthquake motion and economic loss derived from the damage and damage conditions, the earthquake resistance design and the restorable level of the structure need to be improved, so that the earthquake vulnerability curve has important guiding significance for constructing tough cities.
The above description is only illustrative of the preferred embodiments of the present application and is not intended to limit the scope of the present application in any way. Any changes or modifications made by those skilled in the art based on the above disclosure should be considered as equivalent effective embodiments, and all the changes or modifications should fall within the protection scope of the technical solution of the present application.
Claims (6)
1. A civil defense engineering structure earthquake vulnerability assessment method is characterized in that the civil defense engineering structure vulnerability assessment method based on dynamic conditions quantitatively evaluates the civil defense engineering structure performance and vulnerability under earthquake loads.
2. The method of claim 1, wherein the method is performed by:
(1) Selecting an actual representative civil defense engineering structure, determining a scale parameter and a material mechanics parameter of the engineering structure, and acquiring a geotechnical characteristic parameter of a field of the civil defense engineering structure;
(2) Selecting a series of earthquake motions meeting the field conditions as acceleration time-course samples according to the field conditions of the civil defense engineering structure;
(3) Establishing a dynamic time-course analysis model considering the interaction of the soil body and the civil defense engineering structure based on the obtained structural mechanical characteristic parameters, the rock-soil mechanical parameters and the selected seismic oscillation;
(4) Obtaining the response characteristics of a soil-civil defense engineering structure system through a large amount of dynamic time course analysis, and selecting a surface peak velocity (PGV) and an interlayer displacement angle (delta) as a seismic intensity parameter and a civil defense engineering structure performance parameter;
(5) And constructing a civil defense engineering structure earthquake probability demand model based on the selected earthquake intensity parameters and civil defense engineering structure performance parameters, and obtaining the civil defense engineering structure vulnerability curve parameters corresponding to different damage states according to the structure deformation limit values corresponding to different damage states, namely the earthquake intensity median parameter IM and the logarithm standard deviation beta.
(6) And based on the calculated seismic intensity median parameter IM and the logarithmic standard deviation beta, the transcendental probability of the civil defense engineering structure seismic demand can be further calculated, and further a civil defense engineering structure seismic vulnerability curve is established.
3. A method as claimed in claim 2, wherein step (5) wherein the relationship between the structural performance parameter δ and the seismic intensity parameter IM in the seismic demand model is represented by:
In(δ)＝In(m)+qIn(IM)
the parameters m and q in the above formula can be obtained by data fitting regression.
4. A method as claimed in claim 2, characterised by step (6) wherein the seismic vulnerability curve is calculated as follows:
P[ds>ds i |IM]＝Φ(IM/β)
wherein P is f (. H) is the probability of exceeding a certain failure state ds, IM is the probability function for a given seismic intensity level defined by the seismic parameters,. Phi. j Is the median value, β, corresponding to the state that caused the jth failure j Is the log standard deviation, expressing the variability of the vulnerability curve.
5. The method as claimed in claim 2, wherein in the step (4), the different damage levels of civil defense engineering structure performance parameters can be divided into five levels, including: 1) Substantially intact; 2) Slight damage; 3) Moderate destruction; 4) Severe damage; 5) And (6) collapsing.
6. The method of claim 5, wherein said five different damage ratings are as shown in table 1:
TABLE 1 civil defense engineering structure interlaminar displacement angle (delta) and damage grade
。
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| CN117554011B (en) * | 2024-01-11 | 2024-03-29 | 石家庄铁道大学 | Earthquake failure evaluation method, device, terminal and medium for earthquake isolation tank structure |
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