| Facades are external walls of buildings comprising of glazing or metal sheet supported with metal elements. A new industry of aluminum alloy curtain wall as well as point supported glass curtain wall is recently grown up and possesses broad application prospect. This paper has emphasized the study on fatigue properties of point-supported glass and aluminum alloy material, which are widely applied in modern facade systems.In this paper, analysis in combination with experiment and theory were under taken to investigate the fatigue fracture behavior of monolithic glass unit and laminated glass unit using in point supported glass curtain wall and tests on aluminum alloy plate were carried out as well. The brief contents are:1)In this test, full-scale models (3 monolithic safety glasses (8mm) and 3 laminated safety glasses (6mm+1.14mmPVB+6mm)) were used to simulate the working principle of point supported glass under wind condition. The test specimen were subjected to 2 million times high frequency load/unload with concentrated force on single point. By this means, capacity of point supported glass to resistant brittle failure under fatigue load, as well as the anti-fatigue performance of system members, which provided experimental evidence for element design.2)In terms of fracture mechanics of brittleness material, analysis for glass sheet based on fracture mechanical theory was conducted, focused on the impact of toughening of the safe glass plate on the surface micro-cracks and the strength. An assessment of fatigue life of the glass plate is also done; Researches on opening mode crack (crack-I) at the edge of the glass carried out using finite element analysis method agree well with the theoretical studies.3)In this paper, axial tensile fatigue tests on two typical style aluminum alloy plates (6061-T6 and 6005-T5) were conducted by means of conventional methods. A comparison of fatigue performance of 6061-T6 and 6005-T5 was presented through general S-N curve resulted from tests.4)Two million times fatigue tests on 3 smooth aluminum alloy plates (6005-T5) restrained with four points were performed. Additional impact experiments were conducted on each part of the panels, which proved safety and reliability of aluminum alloy members in engineering application.The study results, provides references for the theoretical research and engineering design of point supported glass and aluminum material. |
