Study On Effect For Blast Damage Mitigation Of Reinforced Concrete Column With Different Dry Hanging Profiles

Recently,the frequent terrorist attacks in the world have not only caused casualties in the vicinity of the explosion source,but also spread the blast shock wave to the surrounding building structures,causing structural component destruction or even collapse in succession,causing heavy personnel Casualties and huge property damage.Therefore,it is urgently necessary to avoid or reduce the local damage and damage of the important building structures under the action of explosion load through the technical measures of explosion-proof,explosion-proof and explosion-reduction.In this paper,reinforced concrete columns as the research object,based on different sections of the structural components detonation protection technology and measures.The technology uses widely used in the structural components of the decorative surface of the dry hanging profiles,through the damage profiles and the interaction with the shock wave,to reduce the explosion load on the reinforced concrete column to reduce the explosion load effect of structural elements.In order to study the effectiveness of the proposed method,the numerical simulation technology was used to systematically study the protective effect and protective mechanism of two types of protective technologies,such as dry-hanging stone and dry-hanging aluminum plate.The key factors affecting the protective effect were analyzed.The above optimization design of explosion-proof measures,the main research work and research results are as follows:(1)The damage analysis of reinforced concrete columns under explosive load and the numerical analysis method based on the de-blasting protection of reinforced concrete column with dry-hanging stone and dry-hanging aluminum plate are adopted.And with the help of the evaluation method of the detonation protection effect of reinforced concrete columns,the protection mechanism of the detonation protection measures of reinforced concrete columns based on dry hanging stone and dry hanging aluminum plate was obtained.(2)By the parameter analysis,the key factors affecting the de-blasting protection effect of dry-hanging stone and dry hanging aluminum are studied.The results show that for the dry-hanging stone,the increase of the dry hanging spacing will reduce the peak displacement of the column and increase the axially residual bearing of the column The increase of force and thickness will also reduce the peak displacement of the column and increase the axial residual bearing capacity of the column,so as to enhance the protective effect on the column.For the dry-hanging aluminum plate,the change of the dry-hanging distance has no significant effect on the column protection effect,Increasing the thickness will reduce the peak displacement of the column and improve the axial residual bearing capacity of the column,thereby enhancing the protective effect on the column.(3)The differences of protective effect between two kinds of dry-hanging sections with dry-hanging stone and dry-hanging aluminum plate are compared and analyzed.The reasons of the difference in protective effect are analyzed from the perspective of the explosion-proof mechanism of the two,and the corresponding design recommendations of blasting optimization are put forward.