| dc.description.abstract | When the bridge failure events come, vehicles on the bridge may not get good vision or can’t exactly know the health of bridge forwardly, it is possible that people and vehicles will get great damage. The subject of study is to develop a reliable, low maintenance, cheap and effective warning system of bridge collapse, without the monitoring data and complicated theory, only judge from whether the event of bridge collapse happened or not, when it did, the warning system can exactly warn the people on the bridge to avoid the unnecessary damage. There are Water-Source and Circuit warning system respectively, the former uses the controller of water level in the water tank as detecting component, the water pipe connect the tank to the gap between the beams, when the beams have relative displacement, the cutting device which installs on lateral of beams will cut the pipe and make the water level descend, then the controller works to trigger the alarm, the latter uses the electric wire and relay as detecting component, then install and fix the wire at bridge unit like beams or piers, when it’s a large displacement between beams or piers, the wire breaks because of the pulling force, by the characteristic of relay, when the wire breaks, relay’s interior system will trigger the warning system. This paper has also take advantage of the evaluation table of scouring potential of bridge foundation from Ministry of Transportation and Communications, combining AHP and constructing the structure of hierarchy, regarding the feedback of expert questionaries, then get the weight of evaluation index in the hierarchy, so we can evaluate the scouring potential for the bridge and estimate whether the bridge installs the warning system or not. | en_US |