| Glass structure and structural components have been increasingly used in buildings.Since laminated glass component with rectangular-section has a high slenderness ratio,it is vulnerable to buckling under in-plane compression.By bonding the rectangular-section laminated glass component to flange panel using structural adhesive,the glass component with lateral-elastic restraints is formed,and the stability of the rectangular-section laminated glass component can be efficiently improved.Experimental campaigns,numerical simulations and theoretical analysis were carried out to study the performance of rectangular-section glass components with one-side lateral-elastic restraint(T-shaped cross section)and two-side lateral-elastic restraints(H-shaped cross section)under compression.The corresponding design methods were proposed.The main research work and findings are as follows:(1)Shear performance tests on 24 adhesive connection specimens were conducted.The interfacial shear behavior and failure modes of the adhesive connection with different types of structural adhesives bonded to laminated glass were studied.The influences of type,width,thickness and length of the structural adhesive on the shear performance of the adhesive connection were analyzed.The shear strength and stiffness of the adhesive connection were calibrated.(2)Axial compression performance tests on 26 component specimens were conducted.The structural behavior and load-carrying mechanism of the component under axial compression were studied.The influences of cross-sectional shape,glass type,structural adhesive type,and component geometry size on the axial compression performance of the component were investigated.The main failure modes were identified.(3)Combined compression and bending performance tests on 19 component specimens were conducted.The structural behavior and load-carrying mechanism of the component under combined compression and bending were studied.The influences of loading mode,cross-sectional shape,sectional thickness,and axial compression ratio on the combined compression and bending performance of the component were investigated.The structural behavior characteristics and failure modes were clarified.(4)Numerical models to simulate the compression behaviors of the component were developed.The buckling mode and stress distribution of the component were studied.The load-carrying mechanism of the component was confirmed.A simplified model was developed based on the load-carrying mechanism.The accuracy of the numerical models was validated via test results in terms of load capacities,load-displacement curves,and failure modes.The influences of structural adhesive properties,compression-bending coupling effect,and local constructions on the mechanical behavior of the component were analyzed.(5)Theoretical analysis models of the component under compression were developed.The critical load formulas for the component under axial compression and combined compression and bending were derived based on equilibrium equations and the energy method,respectively.The approximate formula for the number of half-sine waves of the buckling mode was proposed.The accuracy of the formulas was verified by the numerical model.The influences of elastic modulus of the structural adhesive,component geometric size,and axial compression ratio on the critical load of the components were analyzed.(6)The nonlinear buckling behavior of the components was studied by using the proposed theoretical models.The design criteria for the load resistance of the component under axial compression and combined compression and bending were derived with the consideration of glass cracking and adhesive failure.By comparison with the test and numerical model,the accuracy and rationality of the proposed design methods were validated.The influences of key parameters on failure modes and N-M interaction curves of the components were discussed.Suggestions for structural adhesive selection and the strength and construction design of the flange panel were proposed. |
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