Seismic response of precast structures with vertical cladding panels: The SAFECLADDING experimental campaign

Earthq Engng Struct Dyn

2017

Despite the long series of European research projects that has led to the setting of fully reliable seismic design criteria for precast structures, recent earthquakes have shown that a weak point still exists in the proportioning of the connection systems of cladding wall panels. Following this finding, this paper outlines an organic setting of the design problem of precast concrete structures including cladding-structure interaction and describes three possible solutions, namely the isostatic, integrated and dissipative systems. The related fastening arrangements, with the use of existing and innovative connection devices, are also described. This paper comments on the results of the pseudo-dynamic and cyclic tests performed at ELSA Laboratory of the European Joint Research Centre of Ispra (Italy) on a full-scale prototype of precast structure. The conception and the experimental performance of the structure with nine different configurations of either vertical or horizontal wall panel claddings are presented. The analysis of the results highlights the effectiveness of the different solutions in a comparative way

mentioning

confidence: 99%

Conceptual design and full‐scale experimentation of cladding panel connection systems of precast buildings

Toniolo

Earthq Engng Struct Dyn

2017

“…The various hysteretic shapes are reported in Figure 4 (1 example case for every structural type). Details on the geometrical/mechanical properties of the specimens are not presented in this paper for the sake of brevity, while exhaustive information can be found in the above‐cited referenced papers . The corresponding EVD curves shown in Figure 5 (1 example case for every structural type) are evaluated based on the EVD vectors associated to approaches (i) and (ii).…”

Section: Evaluation Of the Equivalent Viscous Damping Curves From Cycmentioning

confidence: 99%

“…Details on the geometrical/mechanical properties of the specimens are not presented in this paper for the sake of brevity, while exhaustive information can be found in the above-cited referenced papers. [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50] The corresponding EVD curves shown in Figure 5 (1 example case for every structural type) are evaluated based on the EVD vectors associated to approaches (i) and (ii). Each point of the EVD vectors is evaluated by considering the mean value of the EVD factors of the 3 cycles associated to a determined imposed displacement.…”

Section: Evaluation Of the Equivalent Viscous Damping Curves From Cmentioning

confidence: 99%

Assessment of a capacity spectrum seismic design approach against cyclic and seismic experiments on full‐scale precast RC structures

Earthq Engng Struct Dyn

Molina

2018

Summary Within the last decades, simplified methods alternative to dynamic nonlinear analysis have been developed to estimate the seismic performance of structures toward a performance‐oriented design. Considering drift as the main parameter correlated with structural damage, its estimation is of main importance to assess the structural performance. While traditional force‐based design deals with calibrated force reduction factors based on the expected structural ductility, other methods are based on the definition of a viscous damping factor defined as a function of the expected energy dissipated by the structure. An example is the capacity spectrum method. This method can be applied even without any a priori calibration or designer arbitrariness. This allows considering several peculiarities of the seismic behavior of precast structures, which may be influenced by nontraditional hysteresis of connections and members, interaction with the cladding panels, P‐δ effects, etc. The paper aims at verifying the soundness and accuracy of this method through the comparison of its predictions against the results of cyclic and pseudodynamic tests on precast structures, including single‐ and multistory buildings either stiff or flexible, obtained on full‐scale building prototypes tested within the framework of recent research projects (namely, “Precast Structures EC8,” “Safecast,” and “Safecladding”). Two simple methodologies of determination of the equivalent viscous damping from a force‐displacement cycle, based on the dissipated energy in relation to 2 different estimates of the elastic strain energy, are addressed and compared. Comments on the possible use of this procedure for the estimation of the seismic performance of precast structures are provided.

“…The feasibility of each of the proposed design solutions has been investigated within the SAFECLADDING research project supported by a grant of the European Commission as part of the program FP7‐SME‐2012 . This research activity included solutions for existing and new precast structures with isostatic, integrated, and dissipative connection systems of the cladding panels . A description of the investigated solutions for each arrangement concerning both vertical and horizontal panels is available in Refs.…”

Section: Introductionmentioning

confidence: 99%

“…15 This research activity included solutions for existing and new precast structures with isostatic, integrated, and dissipative connection systems of the cladding panels. 11,[16][17][18][19][20][21][22][23][24][25] A description of the investigated solutions for each arrangement concerning both vertical and horizontal panels is available in Refs. 10,20.…”

Section: Introductionmentioning

confidence: 99%

Seismic performance of precast concrete structures with energy dissipating cladding panel connection systems

Biondini

Toniolo

2018

Structural Concrete

The cladding‐structure interaction of precast concrete frame systems under seismic action has not been properly addressed in the past, as shown by several failures occurred under recent earthquakes in Southern Europe, which point out the need of a revision of the current design practice and technology. Dissipative systems of connections are proposed to this purpose within a general framework for seismic design of precast structures with cladding panels. The proposed connection systems consist of friction‐based or plasticity‐based devices interposed in between adjacent cladding panels or between the panels and the resisting frame to control the level of transferred forces and limit the displacements of the structure. Monotonic and cyclic experimental tests are carried out on both single connection devices and structural sub‐assemblies of two panels. Furthermore, cyclic and pseudo‐dynamic tests on a full‐scale prototype of precast structure with cladding panels are performed. The influence on the structural response of silicone sealant is also investigated through experimental testing. The effectiveness of the tested dissipative connections of the cladding panels in enhancing the seismic performance of precast structures is demonstrated by means of nonlinear dynamic analyses considering the influence of the roof diaphragm action. Design guidelines are finally provided for both single connectors and panel structural assemblies based on equilibrium and capacity design criteria.