Month: March 2023

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The presented study investigated the improvement of the seismic performance in steel buildings with semi-rigid connections with the Chevron bracing system. The seismic performance of such frames should be improved to prevent possible damages and failures. Accordingly, modelling Chevron bracing system was first done using openness software by adding zipper columns in the semi-rigid steel frames in three 5-, 8-, and 12-story structures as representatives of low-rise, medium-rise, and high-rise buildings, respectively. 84 semi-rigid frames were analyzed under seven near-fault records using dynamic non-linear time history analysis. The analysis of frames was done for both pinned and ductile connections and the case of removing and adding the zipper column. The results showed that the use of zipper columns in Chevron braces in the steel frames with pinned and semi-rigid connections controls both relative story displacement and maximum lateral story displacement. This effect is significant in frames with ductile connections.

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The possibility of progressive collapse as a result of seismic loading has attracted the attention of a number of researchers over the past few years. While using dual structural systems would be a rational choice in order to provide more resistance in this case, there is a lack of comprehensive study on the progressive collapse of these systems, especially when considering the removal of lateral load-bearing members as a part of a removal scenario.  This study investigated the potential for progressive collapse of steel structures with dual lateral force resisting systems subjected to seismic loading using the nonlinear dynamic analyses proposed in the Unified Facility Criteria (UFC) guideline. Toward this end, three different steel structures with 4-, 8-, and 12-story with intermediate moment frames (IMFs) and steel special concentrically braced frames (SCBFs) were examined under the effects of three far-fault ground motion records. For progressive collapse analysis, different removal scenarios including removing corner columns in different stories, as well as simultaneous removing columns and their adjacent bracing systems have been studied. The results indicated that considering seismic loads in progressive collapse has led to more critical conditions in structures by increasing the nodal vertical displacement of the top of the removed element as well as the demand-to-capacity ratios of adjacent columns. Further, it has been found that, among different removal scenarios, simultaneous removing columns and their adjacent bracing system from the structures subjected to three different ground motion records made them more susceptible to seismic progressive collapse.

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The purpose of the work is the evaluation of the behaviour of new wooden buildings with the installation of new dissipative wooden panels. Parametric analyses were conducted considering the use of the dissipative panel only, the system consisting of the panel coupled to an X-Lam wall and the use of steel braces. First, the sizing of the structures was carried out through a response spectrum dynamic analysis, to evaluate the conditions in which the panel could provide the best contribution. To this scope, a first parametric comparison was made considering a 9-storeys wooden building located in three sites in Italy, namely Bolzano, Fisciano and Calitri. Only for the Calitri location, which is characterized by the higher seismic intensity, the investigation was completed through a second parametric comparison which evaluated the contribution of the panel with the variation of the number of storeys with the scope of investigating if the panels are more suitable for high rise or low-rise buildings.  Finally, to check the dissipative behaviour of the structural system incremental dynamic analyses (IDA) and non-linear static analyses (pushover) were executed.

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This work formulates procedures and methods for the design, assembling, mechanical modeling, and experimental validation of a shake-table setup that has been in-house–built at the Laboratory of Structural Engineering of the University of Salerno. The analyzed shake table permits the experimental characterization of small- and medium-scale prototypes of seismic protection devices as well as the execution of experimental studies on mock-ups of earthquake-proof structures. The main features of this setup are the possibility of applying large lateral displacements histories of various shapes; the application of considerably high vertical loads; and the achievement of high peak velocities of the horizontal motion. Based on such targets, the design strategy presented in this work follows a different path compared with other desktop shake tables available on the market. The latter is most often scaled and built on requirements typical of conventional shake table modes (high accelerations, very low vertical loads, control in acceleration/velocity/displacements, etc.). The paper diffusely presents the approach followed by the development team at the University of Salerno – which may be of interest to research laboratories worldwide wishing to build similar setups – and explores the engineering potential of novel seismic protection devices. An experimental characterization test of a bioinspired seismic isolator that recently appeared in the literature is presented

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