Evaluation of seismic assessment procedures for determining deformation demands in RC wall buildings

Abstract

Abstract. This work evaluates the performance of a number of seismic assessment procedures when applied to a case study reinforced concrete (RC) wall building. The performance of each procedure is evaluated through its ability to accurately predict deformation demands, specifically, roof displacement, inter-storey drift ratio and wall curvatures are considered as the key engineering demand parameters. The different procedures include Direct Displacement-Based Assessment, nonlinear static analysis and nonlinear dynamic analysis. For the latter two approaches both lumped and distributed plasticity modelling are examined. To thoroughly test the different approaches the case study building is considered in different configurations to include the effects of unequal length walls and plan asymmetry. Recommendations are made as to which methods are suited to different scenarios, in particular focusing on the balance that needs to be made between accurate prediction of engineering demand parameters and the time and expertise required to undertake the different procedures. All methods are shown to have certain merits, but at the same time a number of the procedures are shown to have areas requiring further development. This work also highlights a number of key aspects related to the seismic response of RC wall buildings that may significantly impact the results of an assessment. These include the influence of higher-mode effects and variations in spectral shape with ductility demands.

Extension of displacement‐based simplified procedures to the seismic loss assessment of multi‐span RC bridges

“…Once the displacement profile is determined, it can be associated with a particular level of seismic hazard via a simplified approach. For building structures, for instance, the computation of displacement profiles for different performance levels has been formulated for RC frames 5,6 and RC shear walls, 7,8 showing, in general, a good agreement with displacement responses obtained through nonlinear response-history analysis (NRHA).…”

Conditional spectrum bidirectional record selection for risk assessment of 3D structures using scalar and vector IMs

“…Five building examples (with plans shown in Figure ) are considered, comprising a three‐story, a five‐story, and three eight‐story infilled RC buildings representative of typical Southern Europe construction practice designed without specific seismic provisions . Two of the eight‐story buildings have nearly identical plans with a perimeter shear wall system (bottom right of Figure ). The only difference is in the length of the walls: In the regular case, walls W1 to W4 are 5.0 m long.…”

Record-to-Record Variability in the Seismic Response of Rc Walls Buildings Subjected to Ground Motions Matched to the Conditional Spectrum

“…It is interesting to note that after yield, the inter-storey drift ratio tends to increase less quickly (with increasing demand) than prior to yield. This is a result of post-yield wall deformations being due to essentially rigid body rotation only (refer [21]). Figure 5b shows that after flexural yielding, the shear force at the base of the wall continues to increase, albeit at a slower rate.…”