Clamp links: A novel type of reciprocal frame connection

Reciprocal frames (RFs) are complex structural systems based on mutual support between elements. One of the main challenges for these structures is achieving geometrical complexity with ease for assembly. This paper describes the development of a new type of connection for RF that uses a single bolt to fix a whole fan. The method used was the Research Through Design, using algorithmic modelling and virtual and physical prototyping. After the exploration of different alternatives, the connection selected was structurally evaluated with a 3D solid finite element analysis (FEM) software and a 2D bar parametric model. Finally, a full-scale pavilion was built as a proof-of-concept. A total of 47 connections were fabricated using four 3D-printed templates combined with a hand router. The construction allowed us to draw conclusions on the connection design and the assembly method, and the process as a whole can contribute to the development of new structural links and production methods.

STUDY ON ADJUSTABLE CONNECTOR OF RECIPROCAL FRAME

In this paper, we design an adjustable connector of reciprocal frame, and a three-dimensional solid model of this connector with Circular Hollow Section has been created in the FEM software Abaqus CAE to study its mechanical properties. When the plastic hinge is formed at the end of the Circular Hollow Section, the connector is still in an elastic state. It is concluded that the adjustable connector of reciprocal frame has high strength and rigidity, realizing the goal for designing higher connector strength over Circular Hollow Section strength. Then parametric analysis is used to analyse the influence of the connector about each part on the mechanical properties, and the flexural rigidity of the connector has been derived. A three-dimensional wire model of reciprocal frames has been created in the FEM software Abaqus CAE, and a full-scale test model of the structure is designed. The numerical simulation results agree well with the test results. It is verified that the reliability of the modeling method and the accuracy of the connector mechanical model.

Constructive system of reciprocal frames in terms of contemporary architecture

In this paper, the reciprocal frame constructions are analyzed, starting from their definition, historical survey, to static and geometric characteristics, types and forms. Although very familiar for their shape, their earlier usage in contemporary architecture was not the same as at present. An overview of some of the more recent examples of conceptual solutions and derived pavilions has been established. These structures represent good example for temporary structures in a form of pavilions. Goal in this paper is to design a sample of a closed permanent building combining classical structural systems and RFs. The chosen geometry was predefined as regular in order to use its properties to determine if there is a possibility to form equal units. Finally, based on defined entities, the pavilion?s conceptual design was made using a parametric design in plug-in Grasshopper and Rhinoceros software.

Design and structural analysis of complex timber structures with glued T-joint connections for robotic assembly

Combining computation and robotic fabrication and assembly creates rationale for new types of design and construction methods which are not bound to constraints of standardization and allows structurally informed differentiation. This research presents methods for designing and analysis of structural behavior for novel types of timber structures made of simple elements which are suitable for robotic assembly. Specifically, structures derived from Reciprocal Frames built with linear timber elements and connected with glued butt T-joints were of interest due to their applicability in integrated robotic fabrication and assembly processes. So far, little has been known about the complexity of their structural behavior and their potential for load-bearing application in construction. In response, this research established a corresponding structural analysis method for such structures and specifically the adhesive-based T-joint connections. Furthermore, this analysis method has been implemented as a computational tool integrated with algorithmic design modeling methods, which supports an architect or an engineer in exploring the potential designs based on immediate structural feedback. Finally, these tools were employed to conduct case studies which show that the structural behavior of the discussed structures is highly complex, and slight geometric modification allows to significantly improve the load-bearing capacity.