| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 106 === Free cantilever corrugated steel web bridge due to steel plates substitute for concrete structure, more traditional cantilever bridge has high strength, low weight, large span, so there is significant reduction in the use of concrete or steel volume, And can meet the terrain, route requirements for a variety of bridge line design
In this case, it’s the Taiwan''s first free cantilever corrugated web bridge and also the deepest free cantilever corrugated web bridge in the world. The height of the steel plate is 7.3 meters. To meet the requirements of the steel plate length, the equipment which produces corrugated steel plate was redesigned and manufactured in Taiwan.
Since Taiwan regulation limitation, the corrugated steel plate and top slab form jointing method is different from the Japanese design. Because wood form site cutting precision is not good, the gap between form and corrugated steel plate is hard to overcome, resulting in leakage of cement and construction efficiency is not good. The problem had solved till the front of the steel plate with rubber and foam.
The controlling and management of pre-cambers in the construction of cantilever bridges effect the future bridge shape and segmental closures. It is a very important issue during construction. If the management of pre-cambers is not properly controlled, the elevations of the cantilever-closure segments will be too large when the bridge is closed. The bridge are subjected to additional loads to achieve the purpose of closure, or make the bridge line irregular that affect the comfort of traffic. To make the traffic smooth adjust the AC paving thickness will increase the extra load on the bridge and increase the construction cost.
In this study, when the upper and lower limit values of the construction monitoring difference exceeds ±25 MM, and there is no other problem, one half of the variance is regarded as the adjustment value of the following segments except the theoretical value. The prediction of camber difference is when the segment is 1/2 span, then the cantilever closure segment is predicted for the camber difference, and the variation is predicted by the regression analysis. The selected variables are the segment to column center distance and each weight of the steel plate of the segment.
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