Plan of level 1 and 2 shows the resolution of one space frame module that emerges from three inverted pyramids. The plans indicate the three-dimensional multiplication on the inner and outer nodes to form a space frame that finally evolves into a truncated pyramid. The rhombic cross section of the space frame members was an outcome of the search for a joint that would be easier to construct. Evolved from the slopes and intersections of the pyramid members, the geometry of the rhombus was found to be most appropriate versus square, rectangular and circular sections. For the Hall of Nations a rhombic section with chamfered edges and a face dimension of 25cm and cross-sectional area of 585 sq.cm was developed. This section shows Raj’s intuitive visualisation and understanding of structures through the rigours of geometry.
(on the right) View through a completed section of the space frame during construction.
Source: Mehta, Vandini, Rohit Raj Mehndiratta, and Ariel Huber. "Hall of Nations and Halls of Industries, New Delhi, 1972." In The Structure – Works of Mahendra Raj, 152-179. University of Chicago Press, 2016