Predicting Dynamic Capacity Curve of Elevated Water Tanks: A Pushover Procedure

Despite the importance of water tanks for water supplies and supporting the community resilience through the firefighting usages in catastrophic conditions, post-earthquake situations especially, a few studies have been done on seismic behavior of water tanks so far. The scope of this paper is to propose a new pushover procedure to evaluate seismic responses of elevated water tanks (EWT) supported on the concrete shaft in the form of dynamic capacity curves (i.e. base shear versus top displacement). In this regard, a series of shaft supported EWTs are simulated considering soil-structure and fluid-structure interactions. The shaft is modelled with frame elements and plastic hinges are assigned along the shaft to consider the material nonlinearity. The effect of soil-structure interaction and fluid-structure interaction are considered through the well-known Cone model and modified Housner model, respectively. At first, parametric studies have been conducted to investigate the effects of various essential parameters such as soil type, water level and tank capacity on seismic responses of EWTs using incremental dynamic analysis (i.e. nonlinear-time-history-analyses with varying intensities). Thereafter, pushover analyses as nonlinear static analyses are performed by variation of lateral load patterns. Finally, utilizing these results and comparing them with mean IDA curve, as an exact solution; a pushover procedure based on the most reliable lateral load patterns is proposed to predict the mean IDA curve of the EWTs supported on the concrete shaft. The obtained results demonstrate the accuracy of the proposed pushover procedure with errors limited to 30 % only in the changing stage from linear to nonlinear sections of the IDA curve

Studies of a structural form for underwater structures

SIGLEAvailable from British Library Document Supply Centre- DSC:D36013/81 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Chapters 5 to 10

This manual provides guidelines to structural engineers designing plastics and reinforced plastics structural components. It discusses applications commonly used in building construction, transportation structures and vehicles, process industries, sanitary facilities, and marine vessels and structures. The volume of devotes space to the fundamentals of elastic response of structures and provides quantitative methods for analysis and design of plates, beams and axial stressed members, flat sandwich structures, and thin rings and shells fabricated from plastic materials. It also reviews the tests and standards used for evaluating structural plastics fire resistance. Tables, diagrams and chapter notes and references are supplied

Geotechnical Engineering for the Preservation of Monuments and Historic Sites III

The conservation of monuments and historic sites is one of the most challenging problems facing modern civilization. It involves, in inextricable patterns, factors belonging to different fields (cultural, humanistic, social, technical, economical, administrative) and the requirements of safety and use appear to be (or often are) in conflict with the respect of the integrity of the monuments. The complexity of the topic is such that a shared framework of reference is still lacking among art historians, architects, structural and geotechnical engineers. The complexity of the subject is such that a shared frame of reference is still lacking among art historians, architects, architectural and geotechnical engineers. And while there are exemplary cases of an integral approach to each building element with its static and architectural function, as a material witness to the culture and construction techniques of the original historical period, there are still examples of uncritical reliance on modern technology leading to the substitution from earlier structures to new ones, preserving only the iconic look of the original monument. Geotechnical Engineering for the Preservation of Monuments and Historic Sites III collects the contributions to the eponymous 3rd International ISSMGE TC301 Symposium (Naples, Italy, 22-24 June 2022). The papers cover a wide range of topics, which include: 　 - Principles of conservation, maintenance strategies, case histories - The knowledge: investigations and monitoring - Seismic risk, site effects, soil structure interaction - Effects of urban development and tunnelling on built heritage - Preservation of diffuse heritage: soil instability, subsidence, environmental damages The present volume aims at geotechnical engineers and academics involved in the preservation of monuments and historic sites worldwide

Evaluación de Desempeño Sísmico de la Edificación Cumbre Instituto de Gastronomía-Chiclayo utilizando un Análisis no Lineal Estático

La presente investigación realizada aplica el análisis no lineal como una metodología que permite pronosticar cómo se comportan las edificaciones y estructuras en general ante la probabilidad de ocurrencia de sismos; debido que, la ubicación geográfica de nuestro medio es de alta peligrosidad sísmica, permitiendo que sean seguras, económicas y modernas. El objetivo es analizar el desempeño sísmico del edificio Cumbre Instituto de GastronomíaChiclayo utilizando análisis no lineales estáticos, para edificaciones de concretos armados, aplicando la norma FEMA 440 (Equivalent Linearization) y (Displacement Modification). Por lo cual, sus aplicaciones en el software sap2000, realizaron un análisis de un modelo teniendo como finalidad en la definición de la propiedad no lineal en edificaciones, a través del cual se obtuvo curvas de capacidades y niveles de desempeño sísmico. Con los resultados se comprobó la edificación en dirección “X”, encontrándose en un en nivel de colapso para sismos según espectros de diseños de la norma E.030, con desplazamientos de 0.428 m y una fuerza cortante de 1725.85 ton, en dirección “Y” se encuentra en un nivel cerca al colapso para sismos, en relación a los espectros de diseños de la norma E.030, presentando desplazamientos en 0.116 m y fuerzas cortantes en 2301.13 ton. El análisis de fuerzas estáticas equivalentes y el análisis dinámico modal espectral se concluyeron que no cumplen con derivas establecidas por la norma E.030, se comprobaron que su estructura colapsó tras aplicarle análisis estáticos no lineales para sismos raros, con respecto a los espectros de capacidades en la norma E.030.TesisInfraestructura, Tecnología y Medio Ambient

Cumulative index to NASA Tech Briefs, 1986-1990, volumes 10-14

Tech Briefs are short announcements of new technology derived from the R&D activities of the National Aeronautics and Space Administration. These briefs emphasize information considered likely to be transferrable across industrial, regional, or disciplinary lines and are issued to encourage commercial application. This cumulative index of Tech Briefs contains abstracts and four indexes (subject, personal author, originating center, and Tech Brief number) and covers the period 1986 to 1990. The abstract section is organized by the following subject categories: electronic components and circuits, electronic systems, physical sciences, materials, computer programs, life sciences, mechanics, machinery, fabrication technology, and mathematics and information sciences