초록 ▼

An impact test method excites a bridge by an impact hammer at an impact point to create impact waves traveling through the bridge toward distal and proximal ends of the bridge where transient responses are measured in time reference to impact excitation. Time delays from an impact trigger time refer

An impact test method excites a bridge by an impact hammer at an impact point to create impact waves traveling through the bridge toward distal and proximal ends of the bridge where transient responses are measured in time reference to impact excitation. Time delays from an impact trigger time referenced to the reception of the transient responses over respective distances traveled by the impact wave provide wave speed indices that can be used to indicate structural change or damage of the bridge when compared to pre-damaged wave speed indices.

대표청구항 ▼

[ What is claimed is:] [1.]1. An impact test method for determining damage of a structure including girders, the method comprising the steps of,impacting the structure at a first test time at an impact point along the structure to create a first impact wave at the impact point, the first impact wave

[ What is claimed is:] [1.]1. An impact test method for determining damage of a structure including girders, the method comprising the steps of,impacting the structure at a first test time at an impact point along the structure to create a first impact wave at the impact point, the first impact wave propagates through the girders away from the impact point to become a first transient response at a monitoring point,measuring the first transient response at the monitoring point,determining a first wave speed of the first impact wave traveling from the impact point to the monitoring point becoming the first transient response,repeating the impacting, measuring and determining steps at a second impact point at second test time to create a second impact wave and a respective second transient response for determining a second wave speed, the first test time being after construction of the structure, the second test time being after the first test time, the first and second transient responses are within a resonant frequency range of the structure, andcomparing the first wave speed to the second wave speed to determining a change in the structure indicating induced damage between the first test time and second test time.