Despite their low probability of occurrence, the consequences abnormal loads may be very important, both in economic terms and human lives. This has stimulated development strengthening retrofitting techniques to mitigate risk progressive collapse buildings. However, application real-scale buildings is still lacking. paper describes analysis retrofit a steel-reinforced concrete hospital building. The performance under different column removal scenarios investigated using nonlinear static...

The paper deals with the seismic retrofit of a multiple building structure belonging to Hospital Centre Avellino (Italy). At first, presents preliminary investigations, in situ measurements and laboratory tests, assessment existing fixed‐base structures. Having studied different strategies, base isolation proved be more appropriate, also for possibility offered by geometry easily create an interface at ground level. design project, construction process, details intervention. Some specific...

The paper proposes a displacement-based design method for seismic retrofit of RC buildings using hysteretic dissipative braces. At first, fully multimodal procedure based on an adaptive version the capacity spectrum is applied to 3D model damped braced structure. Then, properties idealized bilinear are defined characteristics compound system thus accounting frame-damped brace interaction. Finally, iterative developed provide optimal distribution dampers. proposed overcomes limitations...

Abstract Despite significant progress in research and development of aluminum shear panels recent decades, their implementation for seismic retrofit existing reinforced concrete (RC) buildings can still be significantly extended. Their application is limited by the general lack relatively simple effective design criteria proper guidelines. This paper develops a method using multi-stiffened as dampers. Both nonlinearity structure dampers-structure interaction are considered to give an optimal...

This paper investigates the effects of tensile catenary action on dynamic increase factor (DIF) in nonlinear static analysis for progressive collapse steel-frame buildings. Numerical analyses were performed to verify accuracy empirical and analytical expressions proposed literature cases where is activated. For this purpose, a series steel moment frame buildings with different number spans stories carried out following alternate path method. Different column removal scenarios considered as...

The study investigates the progressive collapse resisting capacity of earthquake-resistant steel moment-resisting frames subjected to column failure. aim is investigate whether these structures are able resist after removal, that may represent a situation where an extreme event cause critical suddenly lose its load bearing capacity. Since response this abnormal loading condition most likely be dynamic and nonlinear, both nonlinear static analyses carried out. vertical pushover analysis (also...

Although the most commonly used isolation systems exhibit nonlinear inelastic behaviour, equivalent linear elastic analysis is in design and assessment of seismic-isolated structures. The paper investigates if model suitable for a seismically isolated multiple building structure. To this aim, its computed responses were compared with those calculated by dynamic analysis. A common base plane connects bearings supporting adjacent In situation, conventional may have some problems accuracy...

The reliability of advanced nonlinear static procedures to estimate deformation demands steel momentresisting frames under seismic loads is investigated. advantages refined adaptive and multimodal pushover over conventional methods based on invariant lateral load patterns are evaluated. In particular, their computational attractiveness capability providing satisfactory predictions in comparison with those obtained by force-based examined. results the methods, used form different variants...

Use of Shape Memory Alloys (SMA) is more and frequent in engineering because their unique properties completely recovering the imposed deformations after heating, or automatically returning to unloaded configuration via a super-elastic process very large strains (till around 10%). The regulated by phase change material, shifting between martensite austenite. Along this transformation, some SMA elastic factor three damping coefficient magnitude. Super-elastic materials exhibit stable...

Despite extensive research studies, the seismic response of infilled reinforced concrete buildings remains an open problem due to both complexity interaction between infill and frame large number parameters involved. Thus, guidelines for modelling analysis are still lacking walls normally treated as nonstructural components in codes. However, it may be not conservative neglect influence infills. In fact, masonry significantly affect stiffness, strength, energy dissipation capacity RC...