Vibration Characteristic And Wind-induced Vibration Investigations Of Energy-saving Sandwich Composite Panels Used In Steel Residential House

In order to implement the national energy-saving environmental protection policies, as well as to respond to the call of building a low carbon society, energy-saving of buildings gradually becomes a hot topic. In this context, sandwich composite panels for steel residential house came into being and developed quickly. As a new kind of exterior cladding for steel residential house, sandwich composite panels hold high bearing capacity and good thermal insulation effect, compared with the traditional wall materials.At present, the research on sandwich composite panels is mainly focused on flexural capacity, but rather on the vibration. The vibration characteristic of sandwich composite panels is related to the noise, wind, earthquake and other aspects of performance, so it is greatly meaningful to the wall's research, production and application. Meanwhile, the main load for the panels in high-rise buildings is wind load, researches of sandwich composite panels suffered from static wind load, in other words, the bending capacity, is relatively mature both at home and abroad, but it is not the case for effect of fluctuating wind. According to the above problem, vibration characteristics of the energy-saving sandwich composite panels are studied both theoretically and experimentally, and calculation and analysis of wind-induced vibration response are conducted for the sandwich composite panels.In order to apply the vibration theory of homogeneous single plate to sandwich composite panels, in the present paper, the equivalent theory for sandwich composite panel is put forward; the sandwich composite panel is simplified into a homogeneous single plate, by the equivalent calculation of stiffness and elastic modulus. This supplies a theoretical foundation for further research of the sandwich composite panels in the bending and vibration performance.In this paper, comparisons on vibration characteristics are made between the equivalent single plate and sandwich composite panels with different joint strength, a relationship between the equivalent theory and panel's integrity. Meanwhile, the applying scope of the equivalent theory is also obtained, that is applicable for vibration calculation of sandwich composite panels with good deformation concordance, and used to distinguish the integrity and deformation of the comparison study.This paper conducted a large number of parameters calculation by the finite element method and analysis of the impact factors of energy-saving sandwich composite panels, including the diagonal layout of the wire, diagonal wire diameter, spacing, concrete strength grade, the thickness of concrete slab.In order to verify the reliability and accuracy of the finite element model, and to provide first-hand data for the research of sandwich composite panels, two full-scale energy-saving sandwich composite panels were made, its vibration characteristics is studied. Mode, natural frequency and damping ratio of test results are obtained. By comparing the results of two panels, analysis of diagonal wire on the wall vibration characteristics is made. Meanwhile, test results and the ANSYS results are compared to validate the accuracy and applicability of the ANSYS model for different panels.The efficiency of pseudo excitation method in random vibration calculation is verified in the paper, compared with the traditional algorithm, the pseudo excitation method is rapid, precise and efficient. The pseudo excitation method is used in wind vibration calculation, the random vibration response spectrum analysis of equivalent panel under fluctuating wind loads is carried out, partial nodes on the panel under node response power spectrum of wind load is obtained, sensitive analysis of different sites of the panel under wind vibration is conducted, and the number of models that take part in the calculation on the panel influence response. Moreover, energy-saving sandwich composite panel under the action of the wind-induced vibration response in the permitted range, the conclusion that a general state of wind-induced vibration will not affect the safe and proper use of the wall is summarized, which is meaningful to the further promotion of energy-saving panel.