Lecture 06

Earthquake Damage of RC Buildings and

Advanced Seismic Analysis Using the Beam-Truss-Model

2.5 hours prerecorded, 1 hour discussion

Summary

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.

  • Damage of RC buildings in recent earthquakes 

  • Experimental testing results of cyclic inelastic buckling and rupture of reinforcing steel, and RC components

  • Seismic framing effects between walls, columns, slabs, and beams in RC buildings

  • Explicit modeling of cyclic inelastic buckling and rupture of reinforcing steel in ETABS Ultimate

  • Nonlinear cyclic beam-truss-model (BTM) for RC walls, slabs, columns and beams

  • Computation of diagonal shear failures of RC components using the BTM

  • Modeling of entire RC buildings using the BTM

  • Simplified use of the BTM in ETABS Ultimate