Flexural Behavior of Screen-Grid Insulated Concrete Forms Under In-Plane Loading

Abstract eng:
This paper presents the obtained experimental and analytical results that permitted to describe the flexural behavior of the screen-grid ICF panels, as well as to define the parameters needed to carry out a PerformanceBased Seismic Design procedure. Eleven test specimens were constructed and tested under monotonic and cyclic in-plane lateral loading. Test units were divided into two groups, each one constructed using different prefabricated forms made of expanded polystyrene. The first group included seven walls 120 cm long, 213.5 cm high and 20 cm thick. The rest of the specimens had the same nominal thickness and height, but they had a Tshaped cross section of 116 cm length. All the specimens were designed and detailed to obtain a response controlled by flexural behavior. Results showed a ductile and stable response controlled by flexure for all the test specimens, with yielding of the longitudinal reinforcement and compression failure of the concrete extreme fibers. This study permitted to conclude that screen-grid ICF walls can reach important deformations in the nonlinear range, as well as, a stable response, similar to that of conventional RC walls with similar geometric properties. Furthermore, it was verified that the flexural resistance model for solid RC members is applicable for these elements, taking into account section discontinuities. It was also verified that common cyclic non-linear flexural behavior models are applicable for this type of walls. As a result, performance levels for these elements were defined in terms of the expected lateral displacements. Finally, a typical low-rise residential building in Chile was analyzed and designed based on the results of this study.

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