The Examination of Shape and Type Effects of Supports on Performance Level of Space Structures by Capacity Spectrum for Vertical Load of Earthquake

Rapid growth of population in the societies has caused a great demand of having large spaces without intermediate columns. In this regard a number of professionals have been attracted by the unique potential of space structures to meet emerging needs of people. Acceptance and popularity of space structure among architectures and designers is because of some reasons such as: great orifice covering, magnificent architecture, extremely low weight, the ease of building process, speed in installation, quality of response to earthquake and …. Considering that usually large population live in space structured buildings, resistance and immunity of the structures against destructive factors such as earthquake is very important. In this paper we examine the effects of type and shape of support on performance level of single layer flat space structures and their performance at different risk stages are examined based on the regulations stated in Iranian Standard for Retrofitting of Existing Buildings. Since there are no acceptance criteria for space structures neither in Iranian code nor other International codes, first these criteria are suggested and then by sketching the capacity curves versus different performance levels, the performance point of the structures are obtained. Nonlinear static analyses (push-over) are carried out on the selected models using SAP and ANSYS software. The performance levels and capacity spectrums are obtained by FEMA and ATC40 bylaw

Keywords:

Capacity Spectrum , Non-linear Static Analysis , Performance Level , Performance Point , Single Layer Plain Space Structures