My research project


H Nooshin and OA Samavati (2017) Mallow Domes
A mallow dome consists of a number of 'sectors' each of which is a part of a 'hyperbolic paraboloidal' surface. In the case of the above samples, Example 1 has six sectors and Example 2 has eight sectors. Mallow domes may be constructed as single layer or multi-layer lattice domes. They may also be constructed as shells or as part-membrane systems.
A Behnejad, G A R Parke and OA Samavati (2022) Inspiring the Next Generation - Proceedings of the International Conference on Spatial Structures 2020/21 (IASS2020/21-Surrey7)
The present proceedings contain a collection of 330 papers on various aspects of analysis, design and construction of spatial structures such as gridshells, barrel vaults, domes, towers, retractable systems and tension structures. These papers were written by 763 authors, representing a total of 44 countries for presentation at the seventh International Conference on Spatial Structures. The International Conference on Spatial Structures has been organised and held on five previous occasions by the Spatial Structures Research Centre of the University of Surrey in 1966, 1975, 1984, 1993 and 2002, and in 2011 in collaboration with the International Association for Bridge and Structural Engineering (IABSE) and International Association for Shell and Spatial Structures (IASS). The seventh conference was hosted by the University of Surrey from the UK during 23rd – 27th August 2021; it was combined with the 2020 annual symposium of the IASS. The conference was named IASS 2020/21 – Surrey 7 and its strapline was “Inspiring the next generation”. The planning and delivery of the conference had a long history: beginning in January 2016, and latterly very heavily affected by the worldwide Covid 19 pandemic emerging during late 2019/early 2020. The original planned dates were 24th – 28th August 2020, but as the impact of the pandemic became more profound, the mode of delivery evolved from fully in-person, through hybrid in-person/virtual to eventually becoming fully virtual throughout the revised dates during 23rd – 27th August 2021. The Scientific Committee was formed in May 2018 and had a membership of a hundred and twenty one leading International Engineers and Architects, from both industry and academia; representing over thirty countries. After a worldwide call for abstracts, the Scientific Committee received 468 submissions involving 1061 authors and subsequently each abstract was reviewed at least twice by members of the Committee. Feedback on the abstracts was presented to almost all of the authors and afterwards, three hundred and thirty nine full papers were received. The full papers were, in turn, reviewed by members of the Scientific Committee, who generously gave their time to provide feedback to the corresponding authors. This proceedings include contributions submitted directly by the authors and the editors cannot accept responsibility for any inaccuracies, comments and opinions contained in the text. The editors would like to take the opportunity to thank all authors for submitting their contributions, the Scientific Committee for reviewing the abstracts and full papers and the Organising Committee for their countless effort in making the conference a success. Alireza Behnejad, Gerard Parke and Omidali Samavati University of Surrey, Guildford, UK, August 2021
A Behnejad, G A R Parke and OA Samavati (2021) The 7th International Conference on Spatial Structures and the Annual Symposium of the IASS2020/21- INSPIRING THE NEXT GENERATION (book of the abstract and programme)
The seventh International Conference on Spatial Structures – which has taken place every nine years since 1966, coinciding with the Annual Symposium of the International Association for Shell and Spatial Structures (IASS) – will be a special event for a number of reasons.The Conference will bring the international spatial structures community together after 18 challenging months, providing an opportunity to reconnect, share ideas and form new collaborations. We are particularly excited that this year’s theme, ‘Inspiring the next generation’, will put the focus on young people considering a career in spatial structures, and we are delighted to be welcoming several hundred early career researchers to the Conference. IASS 2020/21 will also be the first Conference in our history to be run as an entirely virtual event. When Covid-19 struck early in 2020, the Organising Committee had already spent nearly four years planning for an in-person event on the University’s campus in Guildford, UK.
H Nooshin, OA Samavati, A Behenjad and G A R Parke (2021) Data generation for prefabrication of single layer spatial structures
Single layer spatial structure roof systems are becoming increasingly popular. In particular, these structures are used as freeform skylight roof systems. These structures are usually constructed as prefabricated systems. So, the components are fabricated in factory and delivered to site for assembly. The component parts of these structures include bar elements, rigid connectors and cladding or glazing panels. For problem free assembly of these structures during construction, the fabrication of the components must be carried out with high precision. This in turn requires accurate geometric data for fabrication. The study of the geometric information necessary for the fabrication of these components is, therefore, an area of importance. Thus, an in-depth study of this area will be of considerable value and this study is the objective of the present paper. The geometric aspects that need explanation and formulation are considered in the course of the discussion and techniques for their solution are put forward. It turns out that the required solutions can be achieved in terms of well-defined procedures that can be turned into 'functions' in a programming environment. The material is presented in terms of an example. Also, a programming language for configuration processing, namely, Formian, is used to exemplify the application of parts of the formulations
H Nooshin, R Kamyab and OA Samavati (2017) Exploring scallop forms
The term ‘scallop form’ is used to refer to a structural form, such as a dome, that has ‘arched’ sectors. Thus, in addition to the general ‘curviance’ of the dome, the sectors are separately arched. The term ‘curviance’ means ‘the way a form is curved’. Also, the term ‘scallop’ refers to the marine creature scallop whose shell has arched ribs. Scallop forms constitute a wide range of spatial structural forms that can provide efficient structural solutions. The form processing programming language ‘Formian’ includes capabilities that allow the geometry of various types of scallop domes to be generated conveniently (visit Formexia.com). Also, the new version of the language, namely, Formian-K has extended the scalloping facilities of the language to include scallop barrel vaults. The objective of this article is to explore the range of possible scallop forms and to explain how these forms may be generated using the ‘scalloping functions’ of the Formian language. This article contains many practical examples, in terms of which the generation of forms is discussed. This article is meant to be a practical manual for generation of scallop forms. However, to understand all the details of the operations, it is expected that the article is studied together with the necessary background material.
H Nooshin, OA Samavati and A Sabzali (2016) Basics of Formian-K
H Nooshin and OA Samavati (2017) Rounded Regular and Semi-regular Polyhedra
H Nooshin and OA Samavati (2017) Examples of Forms of Lattice Spatial Structures
H Nooshin and OA Samavati (2016) Some Morphological Aspects of Configurations
In the present paper, to begin with, the attention is focused on a number of basic characteristics of the configurations. These characteristics concern such morphological aspects as 'curviance' and 'connectivity'. The term 'curviance' means the 'way in which a configuration is curved' and the term 'connectivity' means the 'way in which the components of a configuration are interrelated'. The morphological characteristics discussed in the paper are then used in considering the constitution of a proposed classification for the lattice spatial structural forms. In this classification system, it turns out that the 'curviance' is the main factor that governs the constitution. Also, at the next level, for the configurations that have the same curviance, it is the pattern that governs the classification. Then comes such aspects as the 'geometric proportions' involved and the 'frequency' of the pattern that are considered as the distinguishing features for the classification.
H Nooshin and OA Samavati (2015) High Precision Data for Snub Polyhedra
Polyhedra and, in particular, Platonic and Archimedean polyhedra, have had a never ending fascination through the centuries. They also provide the bases for an amazingly wide variety of applications from crystallography to geodesic domes and artistic applications. Fortunately, information about the proportions and measurements of polyhedra, in most cases, can be expressed in terms of closed form solutions. This implies that the accuracy of data will be quite high, being only limited by the capabilities of the software used. However, the snub polyhedra, namely, left and right snub cubes and left and right snub dodecahedra, are the exceptions. The reason is that for these snub polyhedra, the closest one can get to closed form solutions are pairs of nonlinear simultaneous equations. The objective of the present paper is to lay down a procedure for providing high precision data for snub polyhedra using these nonlinear simultaneous equations.
H Nooshin and OA Samavati (2014) Exploring the concept of novation
'Configuration processing' is a branch of knowledge that deals with the concepts and software necessary for generation and processing of geometric configurations. 'Formex algebra' and its programming language 'Formian' provide a convenient environment for configuration processing of all kinds. Architects and structural engineers working with structural forms are among experts in many different disciplines that benefit from configuration processing concepts and tools. The objective of the present work is to explore the capabilities of a particular configuration processing concept that is referred to as 'novation'. The concept of novation is implemented as a 'function' in Formian. This function is an effective configuration processing tool. In particular, the function provides a powerful conceptual aid for creation of freeform configurations. In this paper, the emphasis is on the practical considerations and guidance for processing of forms, rather than involvement in details of the mathematical theory. The paper contains many examples providing an overall view of the capabilities of the novation function. In using the concept of novation for processing of configurations, the following main parameters are used for the control of the operation: (1) The overall guide for the formation of the configuration is provided by specification of movements of points on or around a given configuration. The novation function will then cause the configuration to be shaped in 'conformity' (harmony) with the specified movements (relocations). For example, the simple grid of Sketch (a), below, can be formed into the shape of Sketch (b) by specifying the relocations indicated by the arrows. (2) There are a number of choices for the way in which conformity, in the context of novation, may be interpreted. This choice of the 'interpretation of conformity' is a key parameter in creating the required shape.
S Gholizadeh and OA Samavati (2011) Structural optimization by wavelet transforms and neural networks
An efficient methodology is presented to achieve optimal design of structures for earthquake loading. In this methodology a combination of wavelet transforms, neural networks and evolutionary algorithms are employed. The stochastic nature of the evolutionary algorithms makes the slow convergence. Specially, when earthquake induced loads are taken into account. To reduce the computational burden, a discrete wavelet transform is used by means of which the number of points in the earthquake record is decreased. Then, by using a surrogate model, the dynamic responses of the structures are predicted. In order to investigate the efficiency of the proposed methodology, two structures are designed for optimal weight. The numerical results demonstrate the computational advantages of the proposed hybrid methodology to optimal dynamic design of structures.