建筑施工悬挑脚手架受力性能试验研究

发布时间：2018-05-24 12:05

本文选题：土木工程施工 + 悬挑脚手架　；参考：《郑州大学》2014年硕士论文

【摘要】：悬挑脚手架由于其在经济性、施工可行性和安全性等方面的技术优势，在高层建筑中被广泛应用。由于悬挑脚手架在设计和施工中的理论依据不足，多按施工经验进行设计和施工，对于悬挑脚手架的整体受力性能研究也偏少。现行规范规定，悬挑脚手架可以用钢丝绳（拉索）进行卸载，但是钢丝绳不参与悬挑架的受力分析，仅作为一种安全储备。本文对悬挑脚手架进行整体受力性能试验研究，验证钢丝绳的卸载作用，，认为当钢丝绳适当施加预应力时，可以参与悬挑脚手架的受力计算。结合郑州市“昌建誉峰”项目，在悬挑脚手架的施工过程中，对悬挑型钢、钢丝绳和连墙件的内力进行现场监测，并对实测数据进行分析。在此基础上，建立悬挑架的理论计算模型，假设钢丝绳可以承担外加荷载，得到钢丝绳和悬挑型钢端部受力，并与试验值进行对比。建立悬挑脚手架的二维计算模型，进行有限元模拟计算。然后，改变悬挑架设计参数，得到一系列悬挑型钢端部位移。综合理论计算和模拟分析结果，认为钢丝绳在可靠施加预应力的条件下，可以承担35%-40%的外加荷载，其余的外加荷载由悬挑型钢承担，由此建立悬挑架的计算模型，即同时考虑钢丝绳的卸载作用和悬挑型钢作用的超静定“索梁共同工作模型”。根据索梁共同工作模型，悬挑架设计中悬挑梁截面更加合理，悬挑梁锚固端楼板的局部承压验算也更容易满足。钢丝绳可以承担外加荷载的前提条件是，在施工过程中钢丝绳始终保持适当的预拉力状态。所以在高层建筑悬挑脚手架的施工过程中，要定期检查钢丝绳的拉紧状态，使钢丝绳在整个施工过程中一直保持张紧状态，和悬挑型钢一起承担外加荷载。
[Abstract]:Cantilever scaffolding is widely used in high-rise buildings because of its technical advantages in economy, construction feasibility and safety. Because of the lack of theoretical basis in the design and construction of the cantilever scaffold, the design and construction of cantilever scaffold are mostly carried out according to the construction experience, and the research on the overall mechanical performance of the cantilever scaffold is also less. The current code stipulates that the cantilever scaffold can be unloaded by wire rope (cable), but the wire rope does not participate in the force analysis of the cantilever, so it is only a kind of safety reserve. In this paper, the experimental study on the overall mechanical behavior of the cantilever scaffold is carried out to verify the unloading effect of the wire rope. It is considered that the stress calculation of the cantilever scaffold can be participated when the wire rope is properly prestressed. Combined with the "Changjian Xianfeng" project in Zhengzhou City, the internal forces of cantilever steel, wire rope and wall parts were monitored in the construction process of cantilever scaffold, and the measured data were analyzed. On this basis, the theoretical calculation model of the cantilever frame is established. It is assumed that the wire rope can bear the external load, and the force on the end of the steel wire rope and cantilever steel is obtained, and the results are compared with the experimental values. The two-dimensional calculation model of cantilever scaffold was established, and the finite element simulation was carried out. Then, by changing the design parameters of the cantilever frame, a series of cantilever steel end positions are obtained. Synthesizing the theoretical calculation and simulation analysis results, it is concluded that under the condition of reliable prestressing, the wire rope can bear 35% to 40% of the external load, and the rest of the external load is borne by the cantilevered steel, so the calculation model of the cantilever frame is established. That is, the statically indeterminate "cable-beam working model" which considers both the unloading effect of wire rope and the action of cantilever steel. According to the joint work model of cable and beam, the section of cantilever beam is more reasonable in the design of cantilever frame, and the local pressure checking calculation of anchoring end floor slab of cantilever beam is easier to satisfy. The precondition for the wire rope to bear the external load is that the wire rope always maintains the proper pretension state during the construction process. Therefore, in the construction process of cantilever scaffold of high-rise building, the tension state of wire rope should be checked regularly, so that the wire rope can keep tensioning state all the time during the whole construction process, and bear the external load together with the cantilever steel.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU731.2

【参考文献】