Earthquake Damage of RC Buildings and
Advanced Seismic Analysis Using the Beam-Truss-Model
2.5 hours prerecorded, 1 hour discussion
The lecture consists of two parts. The first part, presents the observed damage of RC buildings in recent earthquakes including local bar buckling and fracture of reinforcing steel, global buckling of walls, diagonal shear failures as well as the effect of framing between vertical members and slabs in RC buildings. Part I also reviews experimental large-scale testing results of reinforcing steel, RC components, and RC buildings. The modeling of cyclic inelastic buckling and rupture of reinforcing steel in ETABS is also presented. The second part, presents the advanced seismic analysis of RC components (walls, slabs, beams, columns) and buildings using the beam-truss-model (BTM). The BTM is a design-oriented analysis method developed, in the software Opensees, to model efficiently entire RC buildings and computing accurately their force and deformation capacity affected significantly by flexure-shear interaction. The BTM has been validated using experimental testing results of individual RC walls, coupled RC walls, slabs, and columns including cases where the components experienced shear failures. It has been successfully used to model entire RC core-wall buildings as well as the collapse simulation of the Alto Rio building. The lecture also covers how the BTM can be used in a simplified manner in ETABS Ultimate.