桥梁工程毕业论文_外文翻译.docVIP

Review of assessment and repair of fire-damaged RC highway bridges Abstract：This paper presents a review of the progress of the research and engineering practice of assessment and repair of fire-damaged RC highway bridges，based on which existing and pressing problems of the evaluation method are pointed out．At last，Prospect for the development of assessment and repair of fire-damaged highway bridges is also proposed． Key words：fire damage；assessment；repair techniques；RC structure；bridge 1 Preface Fires can cause great structural damage to bridges and major disruption to highway operations．These incidents stem primarily from vehicle accident (often oil tanker) fires， bridges might also be damaged by fires in adjacent facilities and from other causes．Quite a few of them， though rarely happened，lead to severe structural damage or collapse and casualty． On June 2，2008，fire disaster broke out under the 18th span of Nanjing Yangtze River Bridge and lasted for approximate 75min． During the fire’s development and extinguishment，the structure experienced the sharp rise and fall in temperature causing severe damage to fire- stricken segments．On April 29，2007，a gasoline tanker overturned on the connector from Interstate 8O to Interstate 880 in California．The intense heat from the subsequent fuel spill and fire weakened the stee1 underbelly of the elevated roadway ,collapsing approximately 165 feet of this elevated roadway onto a section of I—880below．On March 25，2004，Connecticut，United States，a tanker truck carrying fuel swerved to avoid a car and overturned，dumping 8000 gallons of home heating oil onto the Howard Avenue overpass． The consequent towering inferno melted the bridge structure and caused the southbound lanes to sag several feet Undocumented number of bridge fires occurring throughout the world each year cause varying degrees of disruption，repair actions，and maintenance cost．Although fires caused damage to the bridge structures ,some bridges continue to function af