Study On The Seismic Damage Loss Assessment Of Highway System

The highway system is an important part of lifeline engineering and has agreat influence on people’s production and life. Once damaged in theearthquake, it will not only cause huge direct economic loss, but also seriouslyaffect the conduct of earthquake relief work and result in greater casualtiesand economic loss. The highway system was severely damaged and did resultin huge direct economic loss (about61.2billion RMB) in Wenchuanearthquake which occurred on May12th,2008. And the rescue action isgreatly hampered by the destruction of the road infrastructure. Earthquakeemergency relief operations bases on the rapid understanding of the disaster,and an important aspect of it is a quantitative assessment of the seismicdamage loss. While the existing seismic damage loss assessment method isfocused on the building loss assessment, not on highway system. The resultsof the assessment lacks of the accuracy because of lacking of the systematicseismic damage loss assessment method. Therefore, the study on seismicdamage loss assessment of highway system has a very important significance.Based on the method and principle of the building seismic damage lossassessment, the seismic damage loss assessment method for highway systemis established in this paper.1. The significance and development process of the seismic damage lossassessment, classification of seismic damage loss, loss calculation model, thecomposition and classification of highway system and the researchingbackground of this paper are discussed.2. The seismic damage classification of the embankment, retaining walls,beam bridge, arch bridge and tunnel are mainly based on the seismic damageof highway system in Wenchuan earthquake, Tangshan earthquake andHaicheng earthquake. The main seismic damage phenomenon of highwaysystem, which is obtained by means of statistical analysis, provides areference for classification of earthquake damage.3. The existing classification of earthquake damage to highway system iscompared and analyzed. According to the seismic damage distribution in"road section", the "road section" is divided into "sub-road sections"，and theseismic damage is assessed and recorded on "sub-road sections". The road isdivided into embankments and retaining walls for damage assessment. Thebridge is divide into the beam bridge and the arch bridge for damageassessment. The seismic damage of bridge’s main structural member is gradedand the specific content is given.4. Three existing calculation methods of earthquake loss ratio and theiradvantages and disadvantages are discussed.The loss ratio of beam bridge isdetermined by defining boundaries damage status and the loss ratio of arch bridge and tunnel is done by questionnaires.5. The overall process of seismic damage loss assessment of highwaysystem is established. The regionalization principle, method and contents ofseismic damage survey, the replacement unit price, damage ratio, seismicdamage survey form and loss calculation formula are determined in this paper.