CN-122021063-A - Method for rapidly predicting damage radius of steel concrete building structure under internal strong impact

CN122021063ACN 122021063 ACN122021063 ACN 122021063ACN-122021063-A

Abstract

The invention discloses a method for rapidly predicting the damage radius of a steel concrete building structure under internal strong impact, and relates to the technical field of impact resistance analysis of building structures. The method takes the generation position of strong impact load in the building structure and the initial pressure and impulse thereof as input, establishes a breaking pressure-impulse criterion relation by determining the critical breaking pressure and critical breaking impulse of main bearing components in the building structure, calculates the propagation and attenuation rules of the strong impact load pressure and impulse in the internal space of the building structure respectively, and directly judges that any parameter is the breaking radius of the building structure when the propagation of any parameter to a certain distance is lower than the corresponding critical breaking threshold value. Compared with the prior method based on the step-by-step conversion of the component damage result, the method has the advantages of direct calculation path and simple flow, can more effectively reflect the integral damage characteristics of the building structure, and is suitable for application scenes such as engineering emergency assessment, structural safety analysis, quick decision and the like.

Inventors

LIU RUICHAO
XU XIANGYUN
ZHANG WEIMING
FANG YUYU

Assignees

中国人民解放军军事科学院国防工程研究院

Dates

Publication Date: 20260512
Application Date: 20260403

Claims (10)

1. A method for rapidly predicting the damage radius of a reinforced concrete building structure under strong internal impact is characterized by comprising the following steps: s1, acquiring the generation position, the initial pressure R and the initial impulse I of a strong impact load in the interior of a reinforced concrete building structure, and determining the critical breaking pressure of main bearing components in the interior of the building structure And critical destruction impulse Establishing a breaking pressure-impulse criterion relation; S2, calculating an attenuation value of the strong impact load pressure in the inner space of the building structure based on the initial pressure P and the propagation distance R; s3, calculating an attenuation value of the strong impact load impulse in the inner space of the building structure based on the initial impulse I and the propagation distance R; S4, determining a critical distance At this distance, the attenuated pressure value is below the critical failure pressure Or the attenuated impulse value is below the critical destruction impulse The critical distance is then And judging the damage radius of the building structure.
2. The method of claim 1, wherein the primary load bearing members comprise at least one of reinforced concrete beams, columns or slab members.
3. The method for rapid prediction of failure radius of steel concrete building structure under internal strong impact according to claim 1, wherein step S1 further comprises establishing a failure pressure-impulse criterion relation for defining critical failure state of the member together, the failure pressure-impulse criterion relation satisfying the following formula: Wherein C is a group equal to And A related constant.
4. The method for rapidly predicting the destruction radius of a reinforced concrete building structure under internal strong impact according to claim 1, wherein in the step S2, the pressure attenuation value is calculated according to the propagation distance R and the internal space characteristics of the building structure.
5. The method for rapidly predicting the failure radius of a reinforced concrete building structure under internal strong impact according to claim 5, wherein the pressure attenuation value P (R) is calculated by a polynomial function and reciprocal function combination model of the propagation distance R, and the calculation formula is as follows: 。
6. A method for quickly predicting the breaking radius of a reinforced concrete building structure under strong internal impact according to claim 1, wherein said impact attenuation value is based on the propagation distance R, the internal space characteristics of said building structure and a correction factor related to said distance And (5) calculating to obtain the product.
7. A method for rapidly predicting the failure radius of a reinforced concrete building structure under an internal strong impact according to claim 6, wherein said impact attenuation value I (R) is determined by including a correction factor And calculating a function model of the reciprocal term of the propagation distance R, wherein the calculation formula is as follows: ; wherein the correction coefficient The calculation formula of (2) is as follows: 。
8. The method for rapidly predicting the failure radius of a reinforced concrete building structure under an internal strong impact according to claim 1, wherein in step S4, the failure radius is the radius of an equivalent circular area centered on the position where the strong impact load occurs.
9. A method for rapidly predicting the failure radius of a reinforced concrete building structure under an internal high impact according to claim 1, wherein the method is used for predicting the failure radius in the engineering design stage to guide the protection design or is used for rapidly evaluating the failure range in the accident emergency stage to assist in decision making.
10. A non-transitory computer readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the method for quickly predicting a failure radius of a reinforced concrete building structure under an internal strong impact as claimed in any one of claims 1 to 9.

Description

Method for rapidly predicting damage radius of steel concrete building structure under internal strong impact Technical Field The invention relates to the technical field of impact resistance analysis of building structures, in particular to a method for rapidly predicting the damage radius of a steel concrete building structure under strong internal impact. Background In the fields of industrial production, public safety and the like, a reinforced concrete (steel concrete) building structure faces risks of strong impact load action (such as equipment explosion, accidental impact and the like) in the interior, and the damage range and damage degree of the structure under the working conditions directly determine scientificity of personnel evacuation path planning, structure antiknock protection design and post-disaster emergency treatment decision, so that the quick and accurate prediction of the damage radius in the building structure becomes one of core requirements in the engineering field. From the engineering application logic, the impact resistance evaluation of the building structure needs to consider the accuracy and timeliness, namely, on one hand, main bearing components such as beams, columns, plates and the like in the structure do not work in isolation, but have obvious space constraint effect and combined synergistic effect, the integral anti-damage capability cannot be obtained by simply superposing the damage results of the single components, and on the other hand, a disaster emergency scene (such as after an explosion accident) provides a quick response requirement for the evaluation of the damage range, and data support is needed to be provided for rescue decisions in a short time. Compared with an indirect method of judging the damage state of a single component and deducing the damage range of the whole structure through multi-level conversion, the damage radius calculation model of the building structure layer is directly built, uncertainty introduced in the conversion process can be avoided, the damage characteristics of the whole structure can be intuitively reflected, and the method meets the core requirements of practical application of engineering. However, the existing prediction technology for the strong impact damage range in the steel concrete building structure still has obvious defects that firstly, the construction of a damage criterion depends on single-shaft damage test data of typical bearing components, the critical damage state of the components is reversely mapped to the whole damage range of the building, the combined effects of interaction among the components, space layout constraint and the like are not fully considered in the process, so that the problem that the damage range assessment result is prone to be deviated from conservation or distortion with the actual working condition is solved, secondly, the conversion process from the component damage parameters to the whole structure damage range involves a large number of structural mechanical parameter iteration and complex numerical simulation, the calculation process is complicated, the requirement on hardware calculation force is high, the operation efficiency is low, the time efficiency requirement is hard to meet, and thirdly, the existing model focuses on the influence of single load parameters (such as only considering pressure or impulse) in many ways, does not form the damage criterion of multi-parameter coupling effect, and the prediction accuracy is limited. In summary, the prior art has defects in terms of the straightness of a calculation path, the characterization capability of the integral effect of the structure and the engineering application efficiency, and cannot meet the dual requirements of accurately reflecting the integral damaged characteristic of the structure and rapidly giving a prediction result. Therefore, the development of the rapid prediction method for the damage radius under the internal strong impact effect, which can be directly established in the building structure layer and has both calculation precision and efficiency, has important engineering value and practical significance for improving disaster evaluation scientificity, optimizing structure protection design and supporting emergency decision intellectualization. Disclosure of Invention The invention aims to provide a method for rapidly predicting the damage radius of a reinforced concrete building structure under internal strong impact, which is used for judging the critical damage radius by rapidly estimating the pressure peak value and impulse attenuation of strong impact load in the propagation process. In order to achieve the above purpose, the invention provides a method for rapidly predicting the damage radius of a reinforced concrete building structure under strong internal impact, which comprises the following steps: s1, acquiring the generation position, the initial pressure R and the initial impulse I of a st