Influence of initial spatial layout on seismic behavior of masonry buildings with curved roof systems

Early design decisions made on building configuration and spatial design affect seismic behavior of buildings. Therefore introducing design guidelines and empirical methods implemented to assess seismic behavior of buildings have been proposed as an appropriate approach. Such concept helps architects to take into the consideration that how their preliminary design decisions influence downstream structural results. In previous efforts guidelines for seismic assessment of irregular buildings configuration and also torsional effect of interior walls-layout have been introduced. While seismic effects of the adjacency in spatial units and associated structural systems are almost ignored. This paper tries to show how spatial layout and specifically adjacency of spatial units affect the seismic behavior of a building when (1) the roofing systems are non-uniform and (2) specific spatial units correspond to the specific types of roofs with specific seismic behavior. The paper focuses on masonry buildings with curved roofing systems. To develop guidelines and empirical methods, we selected conventional masonry residential buildings implemented in central arid and semi-arid zones of Iran, traditionally, as case study. Two approaches have been proposed in the form of seismic guidelines and empirical methods. First, a method is introduced to show how adjacency of spatial units and associated vaults with different seismic vulnerability can affect the vulnerability of whole structure according to the effect of “successive damage”. An empirical method is also proposed to estimate the value and shape of distribution of lateral forces on load-bearing walls transferred by adjacent curved roofs, since lateral forces increase seismic vulnerability of load-bearing walls.