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原文传递 Dynamic Impact Load Tests of a Bridge Guardrail System.

题名：	Dynamic Impact Load Tests of a Bridge Guardrail System.
作者：	gutkowski, r. shigidi, a. peterson, m.
关键词：	roadway bridges, timber bridges
摘要：	Bridge guardrail systems are vital components of roadway bridges. Timber bridge guardrail systems existing at the time of the study described herein met federal bridge design code requirements for static loads. However, at the time of the study described herein, they had not been subjected to either laboratory impact test loads or federal crash tests. A structural concept as an alternative to conventional bridge guardrail system for application in timber bridges was conceived in prior related research on an innovative timber bridge system. Initial laboratory static load tests were conducted on a prototype bridge guardrail specimen, and outcomes were encouraging. However, some improvements were needed in the test set-up. This paper presents the results of the subsequent study, which was conducted after making the improvements. The results showed the main component of a steel hanger performed without significant distress. Applied transverse ramp load was favorably distributed into the transverse floor beam segment of the specimen, and no noticeable damage resulted at q load level comparable to the ultimate load implied in bridge design code requirements of the American Association State Highway and Transportation Officials. An exploratory test under pendulum impact load testing showed the hanger and its connection system performed with no major damage. The main bridge girder sustained structural damage, but extreme handling methods needed to move the specimen into the load position and a reduction in its depth prior to testing may have damaged the girder and contributed to that outcome being suspect. It is recommended that the system be tested under crash loading in the future, but built where no major handling is needed before the crash test itself. / Supplementary Notes: Sponsored by Department of Transportation, Washington, DC. Office of Research and Special Programs. / Availability Note: Product reproduced from digital image. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0803；48p
报告类型：	科技报告