TECHNICAL SOLUTION AND SEISMIC PERFORMANCE TEST OF PCF-MDC SYSTEM

For the key technical problems of the precast concrete frame using metal damper connector (PCF-MDC), two metal dampers, a set of detachable connection scheme and the design method of metal damper are proposed. In order to verify their feasibility and study the seismic performance of the system, a "wet" frame joint (PCF specimen) that is equivalent to cast-in-place joint and two PCF-MDC joints using dog bone damper (PCF-DB specimen) and double bending plate damper (PCF-DP specimen) were designed and fabricated, respectively. The failure mode, hysteretic performance, bearing capacity and energy dissipation characteristic were investigated by quasi-static test. The test results show that the bearing capacity of the PCF-MDC joints has reached expected design value, and the bearing capacicy of PCF-DP specimen is better compared with PCF-DB specimen. The energy dissipation characteristic and seismic performance of PCF-MDC joints is better than those of "equivalent cast-in-place" PCF joint. The connection scheme proposed can reliably transfer the internal force between the metal damper and the precast member. The energy-dissipation mechanism that plastic hinge is formed by the yielding of metal damper at the beam end is reasonable and effective. It has the characteristic of "concentrated damage", which is of benefit to the restoration of building function by replacing the damaged damper after earthquake.