Numerical Simulation On Blast-resistant Performance Of Reinforced Concrete Member Strengthened With High Strength Steel Wire Mesh And Polymer Mortar

With the growing number of terrorist attacks bombings and accidental bombing,the explosion safety protection of large public buildings,government buildings,embassies and other important buildings is becoming more and more serious.The research in the fields of explosion and explosion proof structure under explosion load has become a hot topic in the world.However,Reinforced concrete column and slab as the important vertical and horizontal elements of structure,their capacity of resistant-explosion is of great importance to the whole structure.Once damaged,it will lead to the overall collapse of the structure.High strength steel wire and polymer mortar is a new type of reinforcement technology in recent years.The reinforcement technology has good fire resistance,corrosion resistance and durability,in the building structure and bridge reinforcement has a large number of applications.However,Study on the field of blast-resistant structures is less in and abroad.Therefore,it is significant to study on the dynamic behavior of reinforced concrete key component under the explosive loading with high strength steel wire and polymer mortar.In this thesis,the corresponding finite modeling was given and validates the validity of the simulation result by the software of ANSYS/LS-DYNA under the basis of the existing model and result.Later,reinforce the reinforced concrete column and slab with high strength steel wire mesh and polymer mortar and data analyzing has been done after giving the corresponding finite modeling.Regarding the reinforced concrete slab,reinforcing the bottom,the top and both sides,three kinds of methods was taken,comparative analysis was done on the dynamic effect on the reinforced concrete slab by different reinforce method in this method,parameters such as,the strength of motor,the diameter of the strand and the space of horizontal strand are under consideration for the column,as for the slab,the thickness of motor,the strength of motor,the diameter of the strand are take into account.The result makes a conclusion shown as the following:(1)The simulation result of the reinforced concrete column and slab agree well with the experimental result.The node displacement and damage degree of the reinforced concrete column and the node displacement and the stress of the reinforced concrete slab can be in good agreement with the experimental results.(2)The column and slab reinforced with high strength steel wire and polymer mortar have anti-explosion good performance,the capacity of anti-explosion are obviously improved.The node displacement,steel stress and the degree of the column and slab reduced significantly.(3)For the reinforced concrete column,its easily to find that the thickness of motor and the strength of motor can have more significant effect on the result compared with the diameter of the strand and the space of horizontal strand,but the result of the latter two parameters are also obvious.(4)The paper proposed evaluation method of blast damage reinforced concrete columns with high strength steel wire and polymer mortar.The reinforcement and reinforcement of different parameters antiknock column is evaluated.The results show that the damage index and the damage degree of the strengthened column are greatly reduced;In addition,the effect of the thickness of mortar,the strength of mortar,steel wire strand diameter and the space of horizontal strand have differing impacts.(5)For the reinforced concrete slab,compared with the parameters of the diameter of the strand and the strength of motor,the thickness of motor does great effect on the reinforcement,but,the diameter of the strand and the strength of motor have a little more effect on the one-side reinforced slabs than on the both sides reinforced slabs.Finally,based on the simulation result above,the technology of high strength steel wire mesh and polymer mortar is used for the reference of reinforced design and some suggestions for reinforcement are present in this paper.For the blast resistant design of reinforced concrete column,in order to improve the reinforcement effect,it is suggested that optimization of relatively high strength mortar,priority to increase the thickness of the polymer mortar.Secondly,considering the adjustment of the diameter of the steel wire and the space of horizontal strand.For the blast resistant design of reinforced concrete slab,it is suggested that priority to increase the thickness of the polymer mortar,secondly,the mortar with high strength can be chosen,for steel wire diameter as long as can comforms to the standard.In addition,if it is possible to predict the effect of blast loading,should be as far as possible to reinforce the side of the explosion load.