1,720,988 research outputs found
Verification Through Shaking Table Testing of EC8-Based Assessment Approaches Applied to a Building Designed for Gravity-Loads
No full textDevelopment of Software and Hardware Architecture for Real-Time Dynamic Hybrid Testing and Application to a Base Isolated Structure
No full textReal-Time Dynamic Hybrid Test (RTDHT) is a promising experimental testing technique, which combines
numerical simulation and experimental testing of physical specimen in a complementary and
efficient way. However, taking advantage of both numerical and experimental capabilities requires
facing issues related to both environments.
In this article, the design and implementation of a RTDHT hardware and software architecture
is presented. Issues related both to the numerical model and to the experimental setup are
discussed; this is done from a general perspective, as well as referring to a base isolated structure
which represents the implemented case study
Prove su tavola vibrante di un edificio in c.a. progettato per soli carichi gravitazionali, risposta sismica e interazione pannelli-struttura
No full textSeismic Vulnerability Assessment of an Infilled Reinforced Concrete Frame Structure Designed for Gravity Loads
No full textIn the last decades, particular attention has been paid to the seismic vulnerability of existing reinforced concrete buildings designed for gravity loads only. Such buildings, designed before the introduction of capacity design in modern seismic codes, are very common, particularly in seismic prone countries of the Mediterranean area. Due to poor detailing and lacking of capacity design principles, high vulnerability has been highlighted in several past studies. In this article, inadequate seismic response and peculiar damage pattern are investigated by means of shake table tests performed on a 1:2 scaled 3-story infilled prototype. Particular attention is given to the role of beam-column joints and frame-panel interaction. The effectiveness of the EC8-based assessment approach is then evaluated; both linear and nonlinear numerical models, with different levels of sophistication, have been implemented in order to explore their behavioral aspect
Nearb-OPCM3274: Shake table test of a RC building designed for gravity load only: seismic response and frame-panel interaction
No full textInnovative Construction Techniques for Buildings in Seismic Areas: Structural Modeling and Design Issues
No full textExperimental and numerical investigation of a reinforced concrete building designed for gravity loads only
No full textModeling and Design Issues of Non Load-Bearing Permanent Shuttering Systems with Concrete under Seismic Loads
No full textSince the end of the 60 s non load-bearing permanent shuttering systems based on the use of formwork blocks filled with concrete or panels of insulating material covered with spray-concrete were used across Europe for buildings in non seismic areas.The formwork blocks are laid dry, thereby eliminating the various drawbacks caused by the use of mortar, subsequently filled with concrete, thus ensuring an adequate bearing structure. This construction method with a single operation resolves the problems related to the thermal and acoustic insulation, the thermal inertia and the structural behavior; this last taking advantage of the characteristics of the concrete used for the filling. These characteristics provide living comfort and savings on the heating costs. Same advantages characterize the permanent shuttering systems realized spraying concrete, which performs as load-bearing element, on panels of insulating material (such as polystyrene). Extension of the use of such construction techniques in the seismic regions is now envisaged: for this reason, series of experimental tests, both quasi-static and dynamic, are currently under development together with numerical studies. This paper presents the part of the work which faces several issues such as the development of guidelines for the finite element modeling, the evaluation of the internal actions and the design. Key problem is the sought balance between simplicity and accurateness of the model and between the straightforwardness of the design procedure and the resultant structural safety. The research presented in the paper deals with different possible modeling solutions (i.e. frame macro-elements or shell elements), their drawbacks and advantages, looking for a computationally efficient model. Furthermore performance requirements and design rules are discussed as an essential part of the guidelines under development. Finally, a software for the computer-aided design, from the geometrical modeling to the design of structural details, is briefly describe
Integration of EO-based vulnerability estimation into EO-based seismic damage assessment: a case study on L’Aquila, Italy, 2009 earthquake
Full text linkRemote sensing is proving very useful for identifying damage and planning support activities after an earthquake has stricken. Radar sensors increasingly show their value as a tool for damage detection, due to their shape-sensitiveness, their extreme versatility and operability all weather conditions. The previous work of our research group, conducted on 1-m resolution Spotlight images produced by COSMO-SkyMed, has led to the discovery of a link between some selected texture measures, computed on radar maps over single blocks of an urban area, and the damage found in these neighborhoods. Texture-to-damage correlation was used to develop a SAR-based damage assessment method, but significant residual within-class variability makes estimations sometimes unreliable. Among the possible remedies the injection of physical vulnerability data into the model was suggested. The idea here is to do so while keeping all the sources of data in the EO domain, by estimating physical vulnerability from observation of high-resolution optical data on the area of interest. Although preliminary results seem to suggest that no significant improvement can be directly obtained on classification accuracy, there appears to be some link between estimated damage and estimated accuracy on which to build a more refined version of the damage estimator
Is physical vulnerability helpful in SAR-based seismic damage assessment? A preliminary study
No full textRemote sensing is proving very useful for identifying damage and planning support activities after an earthquake has stricken. Radar sensors increasingly show their value as a tool for damage detection, due to their shape-sensitiveness, their extreme versatility and operability all weather conditions. The previous work of our research group, conducted on 1-m resolution Spotlight images produced by COSMO-SkyMed, has led to the discovery of a link between some selected texture measures, computed on radar maps over single blocks of an urban area, and the damage found in these neighborhoods. Texture-to-damage correlation was used to develop a SAR-based damage assessment method, but significant residual within-class variability makes estimations sometimes unreliable. Among the possible remedies the injection of physical vulnerability data into the model was suggested. This paper reports on a preliminary attempt in this direction
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