Blast Performance Of Glass Curtain Wall Considering Fluid-structure Interaction

With the increase of serious terrorist explosions,local military conflicts and accidental explosions in nowadays,researchers and engineers have taken the blast resistance design as one of the main design requirements for building.As the external envelope of the buildings,the blast-resistance performance plays a vital role on protecting the residents.In order to prevent glass fragments from splashing,laminated glass is widely used as safety glass.However,the post-fracture properties of laminated glass are rarely studied,a systematic research on the post-fracture performance of laminated glass is needed.Compared with other structural members（beams,plates,columns,and walls）,the stiffness of glass curtain wall is minor,and there is apparent movement and deformation under explosion.Moreover,the stiffness of the curtain wall is further weakened after the glass is broken,therefore,the influence of the fluid-structure interaction effect on the glass is needed to be studied.By combining theory,experiment,and finite element method,this dissertation presents a systematic study of 1)the calculation method of reflection pressure considering fluid-structure interaction under explosion.2)The post-fracture properties of laminated glass considering the interlayer properties,interfacial adhesion properties and the influence of glass fragment sizes.3)The anti-blast response method of laminated glass curtain walls considering fluid-structure interaction.The main work and conclusions are as follows:1.Firstly,based on the propagation and reflection theory of shock wave in one-dimensional ideal medium,the Rankine-Hugoniot relationship is ingeniously combined with the analytical solution of one-dimensional Riemann problem considering boundary motion,and a simplified algorithm of reflection pressure considering fluid-structure interaction effect is proposed.The simplified algorithm is verified by comparing with the existing fluid-structure interaction method.Furthermore,this method is applied to the simplified single degree of freedom system,and the fluid-structure interaction effects of structures with different boundary conditions are analyzed.Through secondary development,the simplified algorithm is introduced into ABAQUS software,and is used to analyze the fluid-structure interaction effect of thin steel plate in shock tube test,and the accuracy of the proposed simplified algorithm is further verified.2.The properties of PVB（Polyvinyl Butyral,polyvinyl butyral）and SG（Sentry Glass^?,new ionic intermediate film）at room temperature were studied by monotonic tensile test,and the stress-strain curves and mechanical property parameters at0.01～120/s strain rates were determined.Furthermore,the dynamic constitutive models of the two materials under different strain rates are calibrated by genetic algorithm,and verified by finite element numerical experiments.The visco-hyperelastic model is adopted to to consider strain rate effect and nonlinear viscoelastic properties of PVB,and the Johnson-Cook model is adopted to reflect strain rate correlation and plastic properties of SG.The study of the interlayer properties provides fundamental data for the further research of the interfacial adhesion properties of laminated glass.3.The interfacial adhesion properties of medium/high adhesion PVB and SG laminated glass were studied by through-crack tensile test（short for TCT）.Five loading speeds in the range of 5×10^-5～5m/s is designed to study the effect of loading rate on the adhesion performance.In the experiment,the delamination properties of laminated glass were observed through digital image correlation technology from the front and side simultaneously.Furthermore,the interfacial adhesion parameters of PVB laminated glass were calibrated by combining theory with finite element method,which provided reliable data for the fine analysis of the post-fracture performance of laminated glass.4.The mechanical properties of medium/high adhesion strength PVB laminated glass and SG laminated glass with different fragment sizes（5～20mm）were studied under 5×10^-5～5m/s loading speed through Random-cracked tensile test.Furthermore,in order to improve the calculation efficiency of analyzing the explosion resistance of laminated glass curtain wall after cracking,a macro quasi-homogeneous material model was proposed.Considering the difference of sandwich,fragment size and loading speed,the stress-strain relationship was used to describe the mechanical properties,and the results were verified by comparison with the calculation results of the detailed finite element model.5.The response analysis method of laminated glass curtain wall considering fluid-structure interaction under explosion is proposed.Firstly,the whole process of blast response of laminated glass curtain wall is divided into the pre-breaking stage and the post-breaking stage,and the post-breaking stage can be further refined into the initial bending stage and the large deformation tensile stage.The material properties of laminated glass before cracking can be defined by the composite cross-section theory,and the material properties of laminated glass after cracking are defined by the macro quasi-homogeneous material model proposed in this paper.The extrusion effect between the compression side fragments at the initial stage after cracking should be considered in the bending stage after cracking.The ABAQUS simplified algorithm subroutine is introduced for efficient calculation considering fluid-structure interaction effect.The research shows that the fluid-structure interaction effect increases with the increase of explosion load.The fluid-structure interaction effect is more obvious after the glass is broken in the whole response process,and the fluid-structure interaction effect is more obvious under the condition of flexible support.