Multifunctional Newton&;#39;s Cradle Apparatus Associated with Image Analysis to Verify Rock Falling Impact-Energy-Absorbed Construction Materials

• Main Authors: CHEN,JIN-CYUAN, 陳勁銓
• Other Authors: Li-Hsien Chen
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/hjh3y5

碩士 === 國立臺北科技大學 === 土木工程系土木與防災碩士班（碩士在職專班） === 103 === Taiwan’s rockfall disaster frequence is very high at places such as Taroko National Park, Northeast Coast Scenic Area, Su-Hua Highway, tourist attractions and east-west traffic arteries. Serious hazard threatens travelers, cars, roads and housing safety. Taiwan&;#39;s current major solution is the Rock Shed, but because of rockfall’s high impact energy damaging the structures and construction being done in steep mountanious sectors, Rock Shed are extremely expensive to build and maintain. Rock Shed technology is borrowed from outside Taiwan, and consists of a three-tier energy dissipation devices, with the energy buffer, dispersion, absorption characteristics of the Verify Rock Falling Impact-Energy-Absorbed Construction Materials; facilities for impact testing being very difficult to simulate (non-full-scale test ) and the field test price being too expensive (full-scale test) demands for a new ‘device’ that must cope with the requirements, therefore the development of a self-developed Multifunctional Newton&;#39;s Cradle Apparatus (Newton&;#39;s Cradle) tester set, consisted of two contacted measurements: accelerometers(50000 g) (kinematic) and dynamic load cells (222.4 kN) (kinetic) embedded in balls, and non-contacted measurements: 2 high speed cameras (360 fps) for image analysis (displacement to force). Multifunctional Newton&;#39;s Cradle adopt modular design, its pendulum or body punch geometry is adjustable, the test material and its size are also adjustable, and principal characteristic is that the test runs with gravity; without the necessity of a loading system, its capacity is designed with an impact energy from 60 ~ 1118 J; after impact, a swing angle informs the energy dissipation effect of energy dissipation material; It can obtain local and global deformation or displacement, the acceleration field, and then deduct the material impact toughness and energy absorption efficiency characteristics. This research used the Multifunctional Newton’s Cradle model, and above mentioned measurement system, and ran a test of the system without material and with EPS, obtaining a result of a 75% absorption of impact energy on the test with EPS. This result,indeed, prooves the feasibility of the proposed system.