Performance - Based Design of Reinforced Concrete Masonry Structures with Clay Masonry Veneer ( NSF NEES Small Group Project )

Seongwoo Jo and Prof. Richard E. Klingner The University of Texas at Austin

Objectives

■ Study in-elastic behavior of low-rise reinforced concrete masonry

structures with clay masonry veneer under seismic loading

■ Propose refinements to reinforced concrete masonry structures

with clay masonry veneer, oriented toward performance - based

design

Experimental work

Analytical work

■ Development of general, analytical models ( shown below ) of

reinforced concrete masonry structures implemented on FEM - based

software, OpenSees

■ Shaking - table test of a full - scale, one - story reinforced concrete

masonry building with clay masonry veneer

■ Quasi - static tests on reinforced concrete masonry walls with

clay masonry veneer, in - plane and out - of - plane

in - plane out - of - plane

(conducted at the NEES

shaking-table at UCSD)

roof diaphragm

CMU, in - planeCMU, out - of - plane

veneer,out - of - plane

veneer, in - plane

connectors,in - planeconnectors,

out - of - plane

rotational restraintBA

A B

elasto - plastic springs for sliding

inelastic rotational spring

■ Parameter study to evaluate the effects of the characteristics of

structural elements ( connectors, in-plane and out-of-plane walls, roof

diaphragms, etc. ) on the response of the entire structure under

seismic loading

Important points to date

■ Low - rise reinforced concrete masonry buildings with clay masonry

veneer ( meeting MSJC Code and Specification for SDC D ) resist

earthquakes above MCE without collapse

■ Seismic response of buildings and veneer is generally consistent

with performance expectations

■ Seismic response is well predicted by nonlinear dynamic analysis

and static design tools