Abstract
With the widespread use and increasing cycle life of climbing formwork to construct high-rise buildings in earthquake-prone areas, the risk of earthquakes during the construction period increases. Hence, it is necessary to analyze the seismic response of climbing formwork. According to actual climbing formwork in the super high-rise office building of Wanda Plaza in Kunming, China, the finite element model of the climbing formwork is established on the Ansys platform. The correctness of the model is verified by comparing the natural frequencies of the actual climbing formwork and the finite element model. The time-history analysis of the climbing formwork subjected to earthquakes of varying strong magnitudes is carried out. The maximum displacement position and maximum von Mises stress position of the climbing formwork under different working conditions are determined, and the seismic response of the climbing formwork is analyzed. It has been found that when the formwork is under construction, the maximum displacement position of the climbing formwork is at the center of the long beam of the upper platform, and the maximum von Mises stress position is the joint of the outer pole of the main platform and tripod. Under the climbing condition, the maximum displacement position of the climbing formwork is at the top of the outer pole of the upper platform, and the maximum von Mises stress position is the joint of the beam of the tripod and guide rail. The climbing formwork is partially damaged under the simulated earthquake. However, the displacement is large, and some components have reached the yield state. It is recommended to strengthen the connection between the upper platform and the guide rail and enhance the strength and rigidity of the outer pole and tripod. Climbing formwork is more sensitive to horizontal earthquakes and has minimal sensitivity to vertical earthquakes. The structure attached to the climbing formwork will reduce its sensitivity to earthquakes. The research results are of practical significance for seismic design and improvement of climbing formwork.
Highlights
With the progress of technology, climbing formworks are more widely used in the construction of high-rise buildings [1]
(1) Under the climbing condition, the maximum displacement position of the climbing formwork is at the top of the outer pole of upper platform, and it is recommended to strengthen the constraint. e maximum von Mises stress position of the climbing formwork is the joint of the beam of tripod and the guide rail. e maximum von Mises stress did not exceed the yield strength of 235 MPa, indicating that the components did not yield
(2) Under the construction condition, the maximum displacement position of the climbing formwork is at the center of long beam of the upper platform
Summary
With the progress of technology, climbing formworks are more widely used in the construction of high-rise buildings [1]. For most earthquakes in China, buildings in earthquake-prone areas have not been damaged due to good seismic performance and protective measures [9,10,11]. Liu et al [13] studied the safety control of hydraulic climbing formwork, analyzed the main risk factors of hydraulic climbing formwork construction, mainly considering the stability of its connection with the structure, and proposed corresponding control measures. Many temporary construction structures such as climbing formwork at the construction site have less resistance to earthquakes. Based on the measured high-magnitude earthquakes, the RIM-SCS80 climbing formwork in the actual engineering (super high-rise office building of Xishan Wanda Plaza in Kunming, China) is used as the analysis object, and the finite element model is established on the Ansys platform. In the construction process of super high-rise buildings, it is highly likely to suffer from earthquakes. erefore, it is necessary to analyze the seismic response of the climbing formwork during actual engineering under strong earthquakes and provide references for seismic design and improvement of climbing formwork
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