Performance Of Hybrid Structure Research Articles

Structural Performance of Demountable Hybrid Floor Systems Under Monotonic and Cyclic Loading

AbstractThe building sector is actively researching and reviewing technical solutions for de‐construction, driven by the increasing importance of sustainability requirements, as outlined in the EU Commission's ‘Green Deal,‘ which aims to achieve net‐zero greenhouse gas emissions by 2050. Two key research areas in efficient structural design strategies are the performance of hybrid structures, which combine mechanical properties and architectural appearance of different materials, and the techniques and mechanical properties of connections between structural components that enable deconstruction and reuse. However, there is a scarcity of studies and methods focused on demountable and hybrid structural systems, limiting the understanding of their overall structural performance at a real‐structure floor level. In this paper, a finite element model is presented to conduct a comparative study between the traditional floor system with welded stud connections and the demountable floor system with coupler‐embedded bolted connectors. The numerical results showed that the serviceability loading capacity of the demountable floor system was 8% lower, and the difference in ultimate resistance was further enlarged. Reusing a demountable floor system, analysed in the case study, had little effect on the ultimate resistance, but it is difficult to exclude local plastic deformation after the first life cycles.

From attached shape memory alloy wires to integrated active elements, a small step? Impact of local effects on direct integration in fiber reinforced plastics

In this publication, major challenges occurring during integration of active elements made from shape memory alloys in fiber reinforced plastics are discussed. Tightly focused experimental tests with a properly chosen setup enable spatially resolved stress and temperature measurement, revealing important material characteristics which have to be considered for the design of integrated active elements. The detwinning process of the martensite during elongation of the shape memory alloy elements shows a nucleation, leading to critical inhomogeneous strain distribution. By investigating the strain rate-dependent behavior the nucleation mechanism is revealed. The measured local strain and actuation behavior of the active elements and its influence on the performance of hybrid structures is discussed. Also a clamped heating process is investigated to show how stress redistribution affects the processing of hybrid structures during a hot curing process.

Optimization Design of Core Thickness of Exterior Frame and Core Hybrid Structures in High-Rise Buildings

Considering core thickness is important issue to performance of exterior frame and core hybrid structure in high-rise buildings, seismic response analysis is conducted by response spectrum method for finite element models with different core thickness. The optimization design of core thickness of hybrid Structures on the basis of the seismic response is studied, the core thicknesses are chosen as design variables, the objective function about core volume is adopted, some specification requirements such as deformation, the ratio of lateral stiffness to gravity, storey shear to gravity, storey shear of exterior frame, axial compression ratio of column and wall limb, bearing capacity of structural member and core construction are regarded as restricting conditions, the optimal mathematical model is established for reflecting integrity dynamic properties of hybrid structure. The ANSYS software is used for optimizing tool, the hybrid structures optimization design are made through different initial values for verifying convergence of optimization method, the optimal result show that the performances of hybrid structure are improved, the internal forces are reduced and the ratios of inner force born by exterior frames are increased in the optimal scheme.