Abstract
Our reader will find here a story about mystery and imagination: a scientist, Mister K, strangely not working at the University for reasons unknown to us, is forced by circumstances to overtake a technical research about possibilities of standardization of reinforced concrete frame members. Ignoring the essentials of everyday knowhow and the tricks used by the most experienced designers, he chooses as a working tool the EH-82 Spanish Code. Being willful and optimistic, he undertakes his task with a great amount of illusion and the hope of a quick ending. However, after carefully reading the Code, he finds some irresolvable contradictions among its several! items, in such a way that, needing desperately the economical counterpart of the assignment, he has no alternative but to convince his client of the appropriateness of undertaking a scientific revision of the present calculation and verification methods before reaching some reasonable level of standardization. The story has a happy end: Mister K succeeds in working on for his Client and, furthermore, he finally comes back to the University thanks to a Spanish CAICYT research project
Highlights
Our reader will find here a story about mistery and imagination: a scientist, l^ister K, strangely not working at the University for reasons unknown to us, is forced by circumstances to overtake a technical research about possibilities of standarization of reinforced concrete frame members
Ignoríng the essentials of everyday knowhow and the tricks used by the most experienced designers, he chooses as a working tool the EH-82 spanish Code
He undertakes his task with a great amount of alusión and the hope of a qulck ending
Summary
El lector encontrará aquí una pequeña historia de misterio e imaginación: un científico, el señor K, apartado de la universidad por razones que desconocemos, se ve obligado a acometer una investigación de índole técnica acerca de la posibilidad de estandarizar piezas de pórticos de hormigón armado. Para satisfacer su curiosidad decide calcular también lo que llamará (por analogía) coeficiente de seguridad característico, esto es, la razón entre carga que produce la rotura cuando todos los coeficientes de ponderación son iguales a la unidad y la carga de servicio característica que la estructura ha de soportar (naturalmente sin romperse) (Fig. 2). Su amigo le advierte que si bien el diagrama parábola-rectángulo se considera apropiado para determinar resistencias (momentos últimos), a la hora de calcular flechas, los proyectistas prefieren otros diagramas, en el convencimiento de que el P-R subestima la rigidez del hormigón en situaciones de servicio. Con respecto a los cálculos del señor K, este hecho afecta a los valores absolutos de L/f calculados, pero no demasiado a las relaciones entre esos valores para distintas vigas. Se dan los momentos extremo y central en el vano:
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