Incidencia de la aceleración de piso en el diseño de los elementos no estructurales en un edificio de 13 niveles estructurado con sistema DUAL

En el presente trabajo realizado se propuso determinar de la aceleración de piso mediante el análisis modal espectral de un edificio multifamiliar de trece pisos en los que se incluyó el cuarto de máquinas y la caja del ascensor el cual tiene como sistema resistente a cargas horizontales a un sistema dual, muy utilizado en el diseño de edificios en el Perú y otros países del mundo en donde se presentan actividad sísmica muy frecuente. El edificio ubicado en la calle Dean Saavedra 368- Trujillo. Con la finalidad de determinar las fuerzas que actúan sobre los elementos no estructurales, es decir los muros de tabiquería, y verificar cuales son los más vulnerables ante la acción sísmica Como primer desarrollo en el análisis estructural se efectuó un diseño mediante un modelo 3d, el mismo que fue sometido a cargas de gravedad y sismo, con la finalidad de obtener los valores de fuerza última requeridos para el diseño según las especificaciones de la norma peruana vigente de los elementos no estructurales, además de sustentar el diseño de cada uno de los elementos que forman parte de la edificación y poder estudiar la incidencia de la aceleración de piso en cada uno de ellos. Para el desarrollo de este proyecto se basó como base los anteriores estudios realizados a fin de poder tener un sustento tanto con los antecedentes como normativos en los cuales se emplearon las siguientes normas del Reglamento Nacional de Edificaciones . Norma E.020 Cargas. Norma E.030 Diseño sismorresistente 2016. Norma E.060 Concreto armado. Norma E.070 Albañileria.In the present work, the determination of the floor acceleration was proposed by means of the spectral modal analysis of a multifamily building of floors of the thirteen in which the machine room and the elevator box were included, which has as horizontal system a horizontal load A dual system, widely used in the design of buildings in Peru and other countries in the world where very frequent seismic activity occurs. The building located at Dean Street Saavedra 368- Trujillo. In order to determine the forces acting on the nonstructural elements, the walls of partition, and the verification of which are the most vulnerable to the seismic action As a first development in the structural analysis a design was carried out using a 3d model, the same one that was subjected to loads of gravity and earthquake, in order to obtain the values of the last force required for the design according to the specifications of the Peruvian standard of non-structural elements, besides supporting the design of each of the elements that are part of the building and the ability to study the incidence of acceleration of floor in each one of them. For the development of this project was based on the previous studies made in order to be able to have a support as much as the antecedents as normative in which the last norms of the National Building Regulations were used. Standard E.020 charges. Standard E.030 EQRD 2016. Standard E.060 reinforced concrete. Standard E.070 masonry.Tesi

Des inconvénients du Schrevelius

Poursuivons notre revue de la "Préface" de Dictionnaire Grec-Français de Planche. L'auteur replace son ouvrage dans l'histoire de l'enseignement du grec, caractérisée par l'usage exclusif des dictionnaires grec-latin, à une époque où le français n'était encore ni codifié, ni reconnu comme une langue de culture et d'éducation (donc au moins jusqu'au XVIe s.), et dont un dernier jalon avait été l'édition du dictionnaire grec-latin de Cornelis Schrevel (Cornelius Schrevel) en 1654, augmentée par..

Health-status outcomes with invasive or conservative care in coronary disease

BACKGROUND In the ISCHEMIA trial, an invasive strategy with angiographic assessment and revascularization did not reduce clinical events among patients with stable ischemic heart disease and moderate or severe ischemia. A secondary objective of the trial was to assess angina-related health status among these patients. METHODS We assessed angina-related symptoms, function, and quality of life with the Seattle Angina Questionnaire (SAQ) at randomization, at months 1.5, 3, and 6, and every 6 months thereafter in participants who had been randomly assigned to an invasive treatment strategy (2295 participants) or a conservative strategy (2322). Mixed-effects cumulative probability models within a Bayesian framework were used to estimate differences between the treatment groups. The primary outcome of this health-status analysis was the SAQ summary score (scores range from 0 to 100, with higher scores indicating better health status). All analyses were performed in the overall population and according to baseline angina frequency. RESULTS At baseline, 35% of patients reported having no angina in the previous month. SAQ summary scores increased in both treatment groups, with increases at 3, 12, and 36 months that were 4.1 points (95% credible interval, 3.2 to 5.0), 4.2 points (95% credible interval, 3.3 to 5.1), and 2.9 points (95% credible interval, 2.2 to 3.7) higher with the invasive strategy than with the conservative strategy. Differences were larger among participants who had more frequent angina at baseline (8.5 vs. 0.1 points at 3 months and 5.3 vs. 1.2 points at 36 months among participants with daily or weekly angina as compared with no angina). CONCLUSIONS In the overall trial population with moderate or severe ischemia, which included 35% of participants without angina at baseline, patients randomly assigned to the invasive strategy had greater improvement in angina-related health status than those assigned to the conservative strategy. The modest mean differences favoring the invasive strategy in the overall group reflected minimal differences among asymptomatic patients and larger differences among patients who had had angina at baseline

Initial invasive or conservative strategy for stable coronary disease

BACKGROUND Among patients with stable coronary disease and moderate or severe ischemia, whether clinical outcomes are better in those who receive an invasive intervention plus medical therapy than in those who receive medical therapy alone is uncertain. METHODS We randomly assigned 5179 patients with moderate or severe ischemia to an initial invasive strategy (angiography and revascularization when feasible) and medical therapy or to an initial conservative strategy of medical therapy alone and angiography if medical therapy failed. The primary outcome was a composite of death from cardiovascular causes, myocardial infarction, or hospitalization for unstable angina, heart failure, or resuscitated cardiac arrest. A key secondary outcome was death from cardiovascular causes or myocardial infarction. RESULTS Over a median of 3.2 years, 318 primary outcome events occurred in the invasive-strategy group and 352 occurred in the conservative-strategy group. At 6 months, the cumulative event rate was 5.3% in the invasive-strategy group and 3.4% in the conservative-strategy group (difference, 1.9 percentage points; 95% confidence interval [CI], 0.8 to 3.0); at 5 years, the cumulative event rate was 16.4% and 18.2%, respectively (difference, 121.8 percentage points; 95% CI, 124.7 to 1.0). Results were similar with respect to the key secondary outcome. The incidence of the primary outcome was sensitive to the definition of myocardial infarction; a secondary analysis yielded more procedural myocardial infarctions of uncertain clinical importance. There were 145 deaths in the invasive-strategy group and 144 deaths in the conservative-strategy group (hazard ratio, 1.05; 95% CI, 0.83 to 1.32). CONCLUSIONS Among patients with stable coronary disease and moderate or severe ischemia, we did not find evidence that an initial invasive strategy, as compared with an initial conservative strategy, reduced the risk of ischemic cardiovascular events or death from any cause over a median of 3.2 years. The trial findings were sensitive to the definition of myocardial infarction that was used