关键词: 地裂缝, 模型试验, 桥面, 破坏型式

Abstract:

Based on similar principles, two large-scale bridge models were established and carried out. It is the first time artificial simulated the effect on bridges under activities of ground-fissure; and strain gauges were laid on the bridge decks’ up and down surfaces. The test results show that the different construction bridge decks have different damage forms under the activities of ground-fissure. simply-supported bridge due to unbound, the bridge stress and strain mostly caused by the load on the bridge deck, and the additional stress caused by the activities of ground-fissure is very small; so the possible type of damage is off the beam or off the deck, as for this type of bridge, the most important measure is monitoring the bridge during the activities of ground-fissure to forecast the damage situation before the bridge destroyed by the activities of ground-fissure. While the fixed bridge due to be bound, big additional stress such as pressure, shear and tensile stress maybe be caused by the activities of ground-fissure and turns to damage of the bridge construction. At last, it is pointed out that the simply supported bridge is more suitable than the fixed-bridge over the regional of ground-fissure.

Key words: ground-fissure, model test, bridge deck, form of damage