鋼筋混凝土樑鋼板貼片補強後再受溫之性能研究

The Performance of Steel Plate Reinforced RC Beam Subjected to High Temperature

本文研究之目的是藉由試驗探討鋼筋混凝土樑鋼板貼片補強後遭受高溫之行為表現。本文選用鋼板補強樑為研究標的，試體共四支，一支為不補強不受溫之原型試體、一支為補強不受溫試體、兩支為補強試體各受最高溫為150 ℃及200 ℃。樑斷面採用建築中常用之尺寸，補強則採用鋼板貼覆於樑底以補強彎矩強度之作法。試體完成後先進行預載，隨後在維持預載中進行升溫試驗，當達到預定溫度後將試體冷卻至室溫，最後進行試體壓壞試驗。試驗進行中量測試體內外側溫度變化、最大撓度變化以及極限強度等數據。由試驗結果發現：補強試體之強度隨受溫之增高而降低，另補強試體在預載加熱階段中之最大撓度與跨度比遠大於未受溫補強試體，且補強試體受溫後之破壞最大撓度與跨度比明顯較未受溫之補強試體大。

The purpose of this research is to study the behaviors of steel plate reinforced RC beam subjected to high temperature through tests. There were four RC beams tested in this research. The first one was without reinforcement and was not heated. The second one was reinforced but not subjected to high temperature. The third and fourth one were reinforced and heated up to 150℃ and 200℃ respectively. The reinforced specimen was strengthened by a steel plate bonded to the specimen’s bottom. After curing, the specimen was pre-stressed and then heated with increasing temperature. After heating, all the specimens were left to cool down to the room temperature and then loaded to failure. It is found from the test results that the ultimate strength of reinforced specimen is decreased with increasing temperature and the maximum deflection of heated reinforced specimen is far larger than the non-heated reinforced one during both heating and loading to failure stages.