鋼索補強對鋼管鷹架系統承載力影響之試驗研究

Experimental Investigation on Strength Impact of Cable Supplement for Scaffolding Systems with Wooden Shores

本研究針對鋼管鷹架各類型組合系統進行載重試驗，探討鋼索補強後之鋼管鷹架與木支撐聯合系統極限承載力與破壞模式。研究結果顯示，在鋼管鷹架上搭接85cm長木支撐之鋼管鷹架系統，承載力將大幅下降為純鋼管鷹架強度的40%左右。在鋼管鷹架與木支撐相接處以鋼索補強後，可以有效的提升系統承載力，使鋼管鷹架與木支撐聯合系統的破壞模式由系統挫屈破壞轉變為純鋼管鷹架構件的破壞；鋼索補強面在in-plane方向及與in-plane面呈45度方向時，鋼管鷹架與木支撐聯合系統之承載力可提升為純鋼管鷹架系統強度80%以上。使用鋼索補強時，鋼索預力的施加必須對稱平均，且鋼索端部之反力束制必須確保牢固，方能使承載力有效提升。

This research focuses on loading tests of various scaffolding installations in order to investigate the critical loads and failure models of the scaffolding systems with the upper wooden shores and reinforced cables. The test result shows that the scaffolding system with upper wooden shores 85 cm in length reduces the strength about 40% comparing with the scaffolding system without upper wooden shores. The cables, installed at the position between scaffolds and wooden shores, effectively increase the system critical load. The failure model is changed from the system buckling of the scaffolding system with the upper wooden shores to the member failure of the pure scaffolding system. When the reinforced cable is setup on the in-plane direction and 45 degree to the in-plane direction, the load-carrying capacity of the scaffolding system with wooden shores increases more than 80% of that of the pure scaffolding system. When the pre-stress of the cables is applied symmetrically and the ends of the cables are fixed firmly, the strength of the system increases effectively.