Abstract:Crumb rubber concrete(CRC) was proposed to be used as wrapped layers of bridge piers to improve their anti-collision, vibration absorption and energy dissipation capabilities.The mechanical properties of CRC were studied by using axial compression test.In the test, the influential factors of particle sizes and volumetric contents were considered.Then, pendulum impact tests on model piers with or without wrapped layers were carried out to obtain their natural vibration characteristics, impact response peaks and vibration attenuation properties.Also, the inflceences of different layer styles and impact velocities were studied in those pendulum impact tests.The results show that though CRC provides lower strength and elastic modulus than those of normal concrete(NC), CRC presents a dual effect of anti-collision and shock absorption.Wrapped CRC layers reduce the peak impact force by 12.93%—15.87%, the pier top displacement by 13.10%—32.11%, and the pier bottom strain by 13.1%—46.13%.Furthermore, it enhances the active energy consumption capacity of original piers.This type of anti-collision device can provide effective protection for piers and conform to the concept of green environmental protection, which is worth promoting.
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