When pile driving is difficult and (or) economically not viable, cast-in-place piles are indispensable. Tapered piles, which have top cross-sections larger than the bottom cross-sections, have the potential for substantial advantages over conventional straight-sided piles. This paper investigates the construction and performance of innovative drilled concrete tapered piles. A full-scale pile load-testing program was conducted to evaluate the axial compressive capacity of drilled concrete tapered piles in frictional soil. One straight and three tapered augers were designed and manufactured to produce six piles. The piles that were constructed and tested included four tapered and two straight piles. The testing results showed that tapered piles with a taper angle varying between 0.958 and 1.918 had a load carrying capacity up to 50% higher than the straight-sided piles with equal volume. It should be noted, however, that the experimental results are site specific. Moreover, an analytical expression was developed to evaluate the pile taper effect on its shaft capacity in terms of a taper coefficient, Kt. The value of Kt evaluated from the analytical expression compared well with experimentally measured values. Finally, a two dimensional nonlinear finite element analysis was conducted to simulate the load test conditions, and it proved to be successful.Résumé : Lorsque le fonçage de pieux est difficile ou économiquement non rentable, les pieux coulés en place sont indispensables. Les pieux coniques qui ont des sections en travers plus grandes en partie supérieure qu'en partie inférieure offrent des avantages potentiels substantiels par rapport aux pieux conventionnels cylindriques. Cet article étudie la construction et la performance de pieux coniques novateurs forés en béton. On a réalisé un programme d'essai de chargement de pieux à pleine échelle pour évaluer la capacité en compression axiale de pieux coniques forés en béton dans un sol à frottement. Une tarière droite et trois tarières coniques ont été conçues et fabriquées pour produire les six pieux requis. Les pieux qui ont été construits et testés incluaient quatre pieux coniques et deux pieux cylindriques. Les résultats d'essais ont montré que les pieux coniques avec des angles de conicité entre 0,958 et 1,918 avaient à volume égal des capacités portantes jusqu'à 50 % supérieures à celles des pieux cylindriques. Il faut noter cependant que les résultats expérimentaux sont influencés par le site. De plus, on a développé une expression analytique pour évaluer l'effet de la conicité du pieu sur la capacité de son fût en fonction du coefficient de conicité Kt. La valeur de Kt évaluée à partir de l'expression analytique se comparait bien avec les valeurs expérimentales mesurées. Finalement, une analyse non linéaire à 2D en éléments finis a été réalisée pour simuler avec succès les conditions de l'essai de chargement.

A box shape Prototype Structure of Honeycomb Sandwich Panels of Aluminum 5052 Facings was fabricated with Fabrication of desired shape and size Honeycomb Sandwich One-Shot Fabrication technique which is an effective tool for Cost Panel structures for spacecraft and satellite is an important reduction, reduced number of parts for assembly and Constellation type space programs where mass production is issue regarding cost and weight reduction with maximum required. Mathematical Model was generated from Lagrange's stiffness. Newly developed fabrication techniques for desired Method and Influence Coefficient Method. Eigen Values were shape structures of Honeycomb Sandwich Panels and then calculated for 3-dof system for validation of Mathematical Model investigation by analytical and experimental methods followed generated for Prototype Structure. Sine Sweep Testing was by many researchers [1-5]. Sasano [1] applied One-Shot performed on Prototype Structure to investigate the survivability Fabrication Technique for Spacecraft Structure and tested of applied fabrication techniques and validation of Mathematical survivability of Fabrication Technique under static and Model. Modal Analysis, Normalization of Modes and dynamic loading for spacecraft environment. Seidhgi [2]Orthonormalization of Eigen Vectors were performed to calculate observed static and dynamic response of satellite structure by the Mode Shapes, Modal Matrix and uncoupled equations of FEA and selected optimum shape of the satellite structure. motion in Principal coordinate system. Lotfi [3] proposed a modal analysis method which is dependent

Masonry infill is usually neglected in the design and it is treated as a non-structural element instead of its stiffness and lateral resistance capacity. Their presence in the RC frame could also affect the lateral load resistance. The interaction of infill presence in the RC frame will also depend on the aspect ratio of frame and openings presence in the infill. The infill collapse initiated disaster of RC Framed structures are mainly concerned by the researchers recently. Many researchers considered experimentation up to a single-story single bay frame may be due to constraints in their facilities. A 3-bay 3-Storey Frame is considered in the present study using finite element package using MSC Nastran for different frame such as bare frame, Infill frame with different openings provided in it, and meshing was done finally strains were taken at middle third distances on each member of the internal panel of the bare frame, Infill frame, Infill frame with window opening, Infill frame with door opening, Infill frame with window and door openings and a comparison was made with infill frame and presence of openings in the infilled frame.