At present, the beam-column connection system through a self-centering post-tensioned connection is currently an alternative to improve the seismic behavior in reinforced concrete buildings; by allowing its elements to have a linear behavior (no damage) in the face of displacements produced by seismic actions. This paper deals with the numerical modeling of the seismic behavior for a self-centering connection based on the Discrete Element Method (MED) is presented, with the aim of validating the hysterical response of the numerical model with an experimental test of the literature. The results demonstrated the horizontal distortions in the column, which are the product of the numerical simulation of the model subjected to a load that increases over time with 4 different stiffness coefficients. In addition, the hysteretic graph is presented as a result of the numerical simulation of the model, with an adequate stiffness coefficient and normal damping, subject to a cyclic load that is reversed as a function of time. The movement of the connection is controlled by the horizontal distortions of the column, achieving an approximate reproduction of the hysterical behavior expected in this type of connection. With the results shown, a simple bilinear hysteresis law is proposed, which allows its simplified use for its application in the modeling of reinforced concrete buildings with self-centering connections.
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Statement of the Problem. Multiple sclerosis (MS), the most common demyelinating disease, significantly affects people's quality of life. Traditionally, wellness programs are not implemented to populations with potentially disabling chronic disorders such as MS. The objective of this research study was to investigate the long-term effectiveness of an innovative wellness program on the general health and well-being, and quality of life in MS populations. Methods. This randomized controlled trial compared the impact of a wellness program to a traditional rehabilitation and a social activity program. Outcome variables were measured by the Short Form-36 version 2 (SF-36v2) and the Quality of Life Inventory (QOLI), and by the Occupational Self-Assessment (OSA). A multivariate analysis of variance (MANOVA) was conducted. Results. The wellness group demonstrated a statistically significant increase in the mental composite score (MCS) of the SF-36v2 (p ϭ .093). The wellness group also demonstrated a statistically significant positive difference in the environmental impact scale of the OSA over the traditional rehabilitation group (p ϭ .115) and the social activity group (p ϭ .065). Conclusions. This pilot study supports the effectiveness of a wellness approach in improving coping skills and qualitative of life for populations with chronic disorders such as multiple sclerosis over the long term.
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