Contact Force Response of a Three Span Continuous Highway Bridge-Vehicle Interaction Under Near Fault Ground Motion Based on Statistical Analysis

At present, our country is implementing major national strategies such as western development and the Belt and Road Initiative. The construction of transportation facilities is in a very important position. As the hub of transportation construction, bridges are the key to maintaining the road safety. However, the bridge structure is often affected by multiple disasters in the whole life cycle. Our country and the countries and regions along the “Belt and Road” are mostly disaster-prone areas. Earthquakes and vehicle-bridge collisions under the action of earthquakes are likely to cause damage to bridge structures. Since the near-fault ground motion has a significant vertical effect, which may lead to separation and re-collision between the vehicle bridges, this paper takes a three span continuous beam bridge with a span of 50 m + 70 m + 40 m and a width of 17 m as the engineering background and uses the dynamic model considering the influence of vehicles (contact or separation with the bridge deck) to statistically analyze the vehicle bridge contact force of the vehicle bridge coupling system under the actual near fault ground motion. The results show that under the action of near fault earthquake, when there is a collision between vehicles and bridges, the contact force between vehicles and bridges often reaches several times the vehicle weight, while under the condition of no separation, the contact force between vehicles and bridges generally does not exceed twice the vehicle weight.