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Publications (19)
This study investigates the wind effect on hexa-sectored scallop domes using Computational Fluid Dynamics (CFD) and wind tunnel tests. Similar to the shape of a seashell, the scallop dome is one of the most common domes used to cover large spans. The scallop dome has an additional curvature equal to its sectors compared to a base dome (spherical)....
The efficient utilization of robotic construction of structures requires a review of structural material, elements and details, while traditional construction methods face difficulties in producing some dry concrete joints, robotic methods can manufacture them efficiently. With the rapid advancement of new construction methods, more effort should b...
This article presents an approach for optimizing the location of connections in prefabricated building frame systems. This approach, referred to as the optimum “Connections-Placement-Approach (CPA)”, improves the present design decisions associated with the determination of the location of the connections. It is well suited for automated prefabrica...
The sections of the precast concrete building elements are, most of the times, weakened due to ‘cut-offs’, for their pleasant appearance and easy dry jointing at construction sites. This paper experimentally and numerically evaluates the bending strength of nine precast concrete dry joints, interconnected as ‘beam-to-beam’ and/or ‘beam-to-column’ c...
This paper proposes a method for the optimum design of a new industrialized precast ‘Wall-Floor’ building system using the Artificial Intelligence (AI), in which collaboration between the Engineer and the Architect concludes to the optimum wall configurations. The method provides an easy application of AI to precast construction industry. Conventio...
Heinz Isler as the most famous contemporary shell designer has widely employed physical pre-modelling techniques for construction of many concrete shell structures. Through the physical approach to optimal form finding, Isler accomplished shell structures with robust performance. It would be interesting and beneficial to re-assess Isler’s shells, h...
This paper proposes a general semi-supervised form-finding approach for optimization of shells, where an initial geometry referred to as the “Directive Form (DF)” influences and directs the shape optimization process. The degree of the influence of the DF over the optimization process is controlled by the optimizer algorithm. A normal option involv...
The computational fluid dynamics (CFD) method is widely used today for determining the wind action on structures. Along with the CFD method the wind tunnel experiments are also employed to achieve this purpose. The cost and effort required for a wind tunnel test, however, is much higher than that of the CFD method; therefore, it is beneficial to ex...
This paper studies the increase in strength and stiffness of the composite double-layer grids,
whose top-layers combine the steel frame elements with concrete decks. Firstly, the paper
obtains the ultimate load capacities of square concrete decks with and without ribbed edges
under various support and load conditions. Then, the load capacity of...
This paper numerically studies the wind effect on grooved and scallop domes. The introduction of a groove on a spherical dome causes abrupt change on its wind pressure coefficient (Cp) in the vicinity of the groove. The sharpness of indentation varies with the position angle of the axis of the groove to wind direction and obtains its highest effect...
The concepts of formex algebra, since their introduction in the mid-seventies, have been used widely for processing of various types of configurations, in particular for configurations of lattice spatial structures. This paper extends the scope of application of formex algebra to incorporate Bezier transformations as a method to define curves and c...
The post-Kobe studies revealed that the embedded column bases respond better to the earthquake uplift forces than the exposed column bases. This paper presents the results of numerical and experimental studies for the static pullout strength and modes of failure of the steel column bases (‘roots’) embedded in unreinforced cuboid concrete blocks. Th...
Exposed baseplates together with anchor bolts are the customary method of connection of steel structures to the concrete footings. Post-Kobe studies revealed that the embedded column bases respond better to the earthquake uplift forces. The embedded column bases also, offer higher freedom in achieving the required strength, rigidity and ductility....
The customary exposed column bases of steel construction use anchor bolts. The anchor bolts may be subjected to various combinations of forces. The tensile (or pull-out) actions are one of these forces. The embedded steel sections can replace the anchor bolts in resisting pull-out forces. Depending on the shape of an embedded section, it can resist...
According to standards, the exposed steel column bases and other steel-concrete connections use anchor bolts to resist the tensile (or pullout) actions. The embedded steel sections can replace the anchor bolts in resisting pullout forces. This paper numerically studies the pullout behavior of embedded steel sections with end plates under various co...
The paper studies the buckling behaviour of steel arches under vertical in‐plane loadings. The arches have uniform rectangular sections and their shapes are defined by various mathematical functions. The shapes of some of these arches are frequently encountered in bridge or other ancient constructions built with masonry materials. The study include...
The present paper studies the effect of various factors on the buckling behaviour and load carrying capacity of the steel arch truss bridges. Over three hundred fifty arch trusses are modelled, in Abaqus 6.10.1, and the efficiency of truss pattern, boundary condition, connection type, deck level, rise-to-span ratio, truss depth and the arrangement...
The process of design of a structure should satisfy the rules of structural design, as well as, the personal preferences of the designer. The rules of structural design are based on structural mechanics and are well established. However, there is no well defined method of dealing with the features of design that are dependent on the personal view a...
