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FULL-FIELD LATERAL RESPONSE INVESTIGATION OF HYBRID PRECAST CONCRETE SHEAR WALLS

This paper presents an ongoing research project on the behavior and design of “hybrid” precast concrete shear wall structures for use in seismic regions. The hybrid precast wall system investigated in the paper utilizes a combination of mild (i.e., Grade 400) steel and high-strength unbonded posttensioning (PT) steel for lateral resistance across horizontal joints. The mild steel reinforcement is designed to yield in tension and compression, providing energy dissipation. The unbonded PT steel provides self-centering capability, reducing the residual (i.e., permanent) lateral displacements of the wall after a large earthquake. Both the PT steel and the mild steel contribute to the lateral strength of the wall, resulting in an efficient structure. The paper discusses the results from the testing of a 0.4-scale hybrid wall specimen under reversed-cyclic lateral loads combined with gravity loading. The behavior of the structure was measured using conventional data acquisition techniques as well as digital image correlation. These measurements are used to conduct a full-field investigation of the behavior of the base panel as well as the behavior along the critical joint between the base panel and the foundation. The test results are expected to ultimately support the code approval of the hybrid wall system for moderate and high seismic regions.