Structural design of temporary spatial structures

Abstract

This is a summary of the keynote lecture in the OS ¿Structural design of temporary spatial structures¿, organized by IASS WG19. In Chap. 1, temporary spatial structure (TSS) is defined as a structure, which is used for a limited period of time, and the structural safety of which is supported by a safety control system (SCS). And it is introduced that objective of the WG19 is to draw up a guideline for structural design of TSS, and also that the major concerns of the working are a) design load reduction and b) how to design SCS. In the following chapters, major topics corresponding to these issues are reviewed. In Chap.2, ordinary current building regulations are generally described, where it will be noted that structural performance requirements classified into three; 1) serviceability, 2) structural and life safety, 3) secondary damage protection, and in addition, that building regulations tend to prefer to express performances in definitive terms rather than in probabilistic terms. In Chap. 3, structural performance required of TSS is discussed concluding that; (1) Design levels of load can be reduced only when performance requirements in local building regulation is expressed in probabilistic terms, (2) Modifications of required performances can be allowed only when they are written in technical terms, (3) It is recommended at the modification to take structural characteristics of TSS into consideration and in addition to take advantage of SCS, (4) In some cases, it is necessary to add special performance requirement besides those in local building regulation. Finally in Chap.4, conceptual outline of the structural design guideline for TSS is shown.