Dynamic And Static Characteristics Analysis And Design Of Attached Lifting Frame Hand Frame

Attached lifting scaffolding is one of the key equipment used in the construction of high-rise buildings and super high-rise buildings.It has the advantages of simple operation,fast construction speed,efficiency and high mechanical level,etc.Therefore,it occupies a pivotal position in construction machinery.Especiallywith the development of building facilities to the direction of super high-rises,large-spans,prefabricated buildings,green buildings,etc.Therefore,it makes engineering sense to develop research about the methods that affect the safety and reliability of attached scaffolds.In this paper,the attached lifting scaffold is taken as the research object,and its mechanical characteristics under different working conditions,materials,section size,structural layout and other states are analyzed and optimized.This article mainly focuses on the following parts.(1)Theoretical research on structure design of attached lifting scaffold.The three-dimensional model of the attached lifting scaffold was established by using the software of Solidworks.There determines the constant load,the wind load and the construction live load of the scaffold.Based on the engineering settings,the theoretical verification is carried out.After that,it analyzes the wind load affected on the scaffolding during the construction process,obtaining the standard wind load and the sub-factors.The results show that the designed scaffold meets the requirements of the working conditions.(2)The static characteristics of the attached lifting scaffold are analyzed and studied under different working conditions.The finite element analysis software ANSYS is used to simulate the statics of the scaffold in lifting conditions and operating conditions.which helps obtain the scaffolds’ structural characteristics,such as and the stress,strain,the load transfer paths of load,etc.This points out the structural deformation and stress areas of the scaffold during operation.The influencing mechanism of wind loads on differentworking conditions of scaffolds are studies,and the results show that the lifting working conditions are more sensitive to wind load,and the deformation and stress with wind load are much larger than those without wind load.(3)The dynamics and buckling characteristics of the attached lifting scaffold are studied under different working conditions.Based on the structural statics analysis of previous chapters,the pre-stressed modal analysis of the scaffold is conducted to obtain the vibration modes and natural frequency of the scaffold.It is expected to find the weaknesses of the scaffold structure.The results show that the lifting conditions easily suffer resonance,which sets a theoretical foundation for the research of vibration reduction of scaffolds.After that,the buckling analysis of the scaffold is implemented to obtain the buckling load factors and buckling mode shape of the scaffold.The results reveal the buckling form and the reason why the scaffold is prone to be instable under the lifting conditions.(4)The effect mechanism of the scaffolding material parameters,the geometric cross-section size,the structure layout and the stiffness-mass ratio is analyzed by using quantitative metrics.The results show that the increase of the elastic modulus of the scaffold material has no effect on the stress distribution.When there increases the wall thickness of the scaffold and the static stiffness of the scaffold,the stiffness-to-mass ratio is decreased with the increase of the wall thickness.The increase of the scaffolding lateral support ribs is better to improve the stiffness-mass ratio than the increase of the longitudinal support ribs.The research provides important references and technical supports for improving the reliability and life of the scaffolding.