Sharif Digital Repository

Due to the growth of population and the increasing number of auto-manufacturing plants in the world, governments have to find ways to decrease traffic, environmental pollution, etc. Providing parking lots is another problem with which we have to deal. It seems that designing and building multi-storey reinforced concrete parking structures is one of the ways to resolve this problem. According to complex behavior of concrete in compression and tension, it was so important to use an appropriate behavior model. In this research damage concept is used instead of crack concept which could models concrete behavior appropriately which causes acceptable results. According to uni-axial, bi-axial and... 

In recent years, due to urban expansion and population growth, number of floors and excavations depth has increased. Stabilization of excavations is one of the most important issues in geotechnical engineering. Today, one of the most widely used methods that is used in deep excavations is brace soil by steels and pretension them. In this thesis tries to evaluate static behavior of flexible supporting structures with pretension anchors by using PLAXIS2D, FLAC3D and GEOSTUDIO softwares. The objective of this modeling is better understanding the static behavior of walls, comparing the two and three dimensional modeling and the effect of corners of excavation on deformation. The results shows... 

Given the increasing use of lightweight concrete in the construction industry, particularly in precast elements, evaluating its performance under dynamic loads such as impact is of high importance. This study presents an experimental and numerical investigation into the behavior of slabs made from lightweight and normal-weight concrete under low-velocity impact loads, and evaluates the effectiveness of two strengthening techniques: prestressing and the addition of steel fibers. In the experimental phase, fifteen concrete slabs with identical dimensions were designed and fabricated. The main variables included the concrete type (lightweight and normal-weight), the reinforcement method... 

The study of wave propagation is of central importance in non-destructive evaluation of industrial components and biological tissues. Many biological tissues and polymeric pipelines can be modeled as curved multilayer hyperelastic structures exhibiting incompressible behavior. This dissertation investigates wave propagation in multilayer incompressible orthotropic hyperelastic plates and shells using equivalent single-layer formulations derived from plate and shell theory, enabling a reduction in analytical complexity while preserving the essential mechanical response of the original multilayer systems. For the first time, equivalent single-layer theories are combined with incremental theory...