Structural walls are important components of resisting the lateral loads for high-rise structures. However, the traditional walls are difficult to repair or replace in post-earthquake events. Hence, over the past few years, a research was made of several kinds of replaceable structures such as replaceable coupling beam and replaceable wall toe. In this paper, a new seismic energy dissipation wall structure is proposed. The new wall is one with purposely build-in vertical slits within the wall panel, and metallic dampers are installed on the vertical slits so that the seismic performance of the structure can be controlled. Moreover, the metallic damper is easy to be replaced in post-earthquake events. The proposed metallic damper is with a serial of diamond-shaped holes and designed based on the lateral deformation of the wall. The yielding scheme of the metallic damper is proposed in order to achieve the ductility and energy dissipation demand of the walls. The mechanical model of the metallic damper is established. Finally, the numerical simulations of the metallic damper based on the finite element software ABAQUS are presented to validate the effectiveness of the proposed mathematic model.
The dynamic behaviour of civil structures under strong earthquakes is usually nonlinear or inelastic. Conventional
control approach is almost based on linear theory, such as the linear quadratic regulator (LQR) design. One of the
common characteristics shared by seismically excited civil structures is a distinct subsystem property, which indicates
there are only several floors of civil structures with nonlinear or inelastic vibration and the other with linear vibration. In
this study, a robust control approach combining decentralized control with adaptive fuzzy control is proposed to treat the
nonlinear control for civil structures. The structural system is decomposed into several artificially subsystems, while the
different subsystem is adopted the corresponding control algorithm. The input-to-state stability of the entire system can
be guaranteed by the proposed control method, and an H infinity performance is achieved through a subsystem with the
proposed controller. Numerical examples are presented to demonstrate the effectiveness and robustness of the proposed
controller.
Phenanthrenequinone-doped poly(methyl methacrylate) (PQ/PMMA) material is considered as one of the ideal optical memory polymer for its negligible volume shrinkage and optional shape. Samples were prepared by modifying the polymerization methods of PQ/PMMA materials in different temperatures and the diffraction efficiency of two-wave mixing was improved. During grating recording process, the maximal diffraction efficiency decreases with temperature increasing in the high-temperature-polymerized sample. For the low-temperature-polymerized sample, the maximal diffraction efficiency increases with temperature increasing at some ranges, and then decreases. Moreover, after the grating set-up, a thermal treatment process caused the diffraction efficiency of the low-temperature-polymerized sample to increase but to decrease for the high-temperature-polymerized sample. The diffusion equation was used to explain the interaction dynamics during the thermal treatment process.
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