Study On The SGP's Constitutive Relation Under High Strain Rates And The Responses Of Point-supported Glass Curtain Wall Under Blast Loading

Comparing to PVB laminated glass, SGP laminated glass has superior mechanical properties and durability, so in the current large public buildings and high-rise buildings, this glass curtain wall has been widely used, especially in the current widely used point-supported curtain wall.Within today's world, the terrorist bombings occur frequently, and the accidental explosion of civilian facilities also occurs occasionally, the glass curtain wall of the building bears blast loading firstly as the maintenance structure, flying glass debris caused a lot of casualties, so the research of glass curtain wall's response under blast loading is necessary, the point-supported SGP laminated glass curtain wall's response under the blast loading had not yet been studied, so i took this as my research work, and the main research work has the following sections:(1)In order to obtain the constitutive relation of SGP, this paper used Instran tensile tester and Split Hopkinson Tensile Bar(SHTP) to test the mechanical properties of SGP under low strain rate and high strain rate, taking into account the influence of the temperature, it analyzed the influence to the SGP's properties due to the change of strain rate and temperature, fitting the constitutive relation of SGP under different conditions. In addition, the SGP and PVB interlayer material properties were compared.(2)This paper used the finite element software ANSYS/LS-DYNA as analytical platform, a finite element model of point-supported laminated glass panel was set up, using the method of CONWEP to add blast loading, and the displacement response was comparaed with the test results obtained from the literature, the reflected wave peak overpressure and positive pressure duration obtained from the finite element model were comparaed with the results from tests and the empirical formula, which proved that the finite element model built in this paper using the method of CONWEP to add blast loading is feasible. Finally, it used this model to simulate damage under blast loading, got three typical failure modes and the summary of its damage law.(3)This paper analyzed the change of geometric parameters of point-supported glass curtain wall produced effect, such as the deformation process, panel stress distribution, failure mode and other explosive response, the change of geometric parameters include: interlayer thickness, glass layer thickness, length-width ratio and panel area. Finally it got the conclusion that increasing glass layer thickness, reducing panel area and length-width ratio could significantly improve the ability of anti-explosion of the glass curtain wall.(4)This paper discussed a method to determine overpressure-impulse curve, and determined a overpressure-impulse curve for particular point-supported SGP laminated glass panel, and used this curve to assess explosive damage under three typical TNT equivalent and confirmed the explosion protection safety distance to guide practical engineering design.