Experimental Analysis Of Mechanical Performance For The Cantilevered Scaffolding On Construction

Because of the economic, construction feasibility, security and other technicaladvantages on cantilevered scaffolding, it is wildly used in high-rise building. Due tolack of the theoretical basis in design and construction of cantilevered scaffolding, itis designed and constructed according to construction experience, and for thecantilevered scaffolding, the study of the overall mechanical properties is too little.Provided by the existing specifications, cantilevered scaffolding can be uninstalled bythe rope or zipper. But the rope is not involved in the stress analysis of the cantileverrack, only as a safety margin. This article will have a experimental study on theoverall performance of the cantilevered scaffolding, verified that the unloading of therope. When the rope is exerted the prestress appropriately, The rope can participatein the stress analysis of the cantilevered scaffolding.This article is based on the project of “Changjian Yufeng” in Zhengzhou. In theconstruction process of the cantilevered scaffolding, the cantilever beam, rope andwall pieces are monitored on-site, and the measured data is analyzed. Based on apreliminary analysis of the test data，the theoretical model of the cantilever frame isestablished. Assuming the rope can bear imposed loads, we can get the force of therope and cantilevered beam, compared with the test value. Founded atwo-dimensional computational model of the cantilevered scaffolding, we cansimulate the calculation of finite element. Then, changing the parameters of thecantilevered scaffolding, we can obtain a series of the displacement of the ends ofcantilevered steel. Integrated the theoretical calculation and simulation results, webelieve that under the conditions of a prestressing, the rope can take35%-40%of theapplied load, and the rest of the applied load borne by the cantilevered beam. Therebywe can establish a model of the cantilever frame. The model is staticallyindeterminate, named as “the model that the cable and beam work together”. Theworking model is considered the unloading of the steel wire rope and the cantilever steel at the same time. According to the working model, the section of cantileverbeam is more reasonable in the design of cantilever rack. And it is more reasonablefor the check local pressure of the floor. The prerequisites, why the rope can bearimposed loads, is that the rope can keep tension during the construction process.During the construction process of high-rise buildings cantilevered scaffolding, wemust periodically check the state of the rope. If the rope can keep tension throughoutthe construction process, it can bear the imposed loads with the cantilevered steel.