Dynamic testing of post-tensioned rocking walls

Post-tensioned precast concrete walls have been shown both experimentally and analytically to provide excellent seismic resilience. However, only a limited number of experimental tests have been conducted to investigate the dynamic response of such rocking wall systems. This paper presents the preliminary results of an experimental test program that was conducted to further understand the dynamic characteristics of post-tensioned rocking walls. The experimental test program investigated a single post-tensioned concrete wall subjected to pseudostatic cyclic loading, high speed cyclic loading, free vibration, and dynamic forced-vibration testing. The lateral load response was determined from both the pseudo-static and high speed cyclic tests, and closely matched the response calculated using an existing analysis procedure. Free vibration decay was used to determine the coefficient of restitution which aligned well with Housner’s formulation. The dynamic forced-vibration testing using an eccentric mass shaker excited the structure into the rocking mode and the lateral displacement response of the wall is presented.

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