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发布时间：2022-04-24 14:56
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热心网友
时间：2022-05-25 12:58
The developed countries with high Falsework plane frame for the basic unit erection ~ [3] [5], e to the economic conditions of China's limited use of fastening and template Bowl-high scaffold, and their force Plane performance than just posture Falsework. In the frame and started in the bowl-dection, the paper selected nodes poor mechanical properties of ultra-high fastener stent template for the study.
Falsework fastening the limit of ultra-high capacity can be directly obtained by experiment, but because more and stent Ligan higher, test equipment for the requirements of higher test very difficult.
Ultimate strength can also be obtained by theoretical analysis. From the theoretical analysis and calculation of the angle, high impact on the ultimate strength Falsework
Main factors are: (1) lower inspection and acceptance criteria; (2) structural measures, (3) erection parameters. [6] of the first study on the impact of the ultimate strength, the rate is Ligan initial bending pipe wall thickness and the impact on the ultimate strength coefficient. Structural measures in the literature [7] The approximate algorithms, discussed the scissors on the availability of capacity limits the impact of vertical scissors are obvious, and the role of scissors limited role conclusion by the literature [8] more accurate method of calculation of the level of scissors and vertical scissors erection of the five methods on the critical buckling load mode and the impact of stent found in the template has been set up around the vertical scissors and the top and bottom the level of scissors established under the conditions of every four across the middle set up a vertical scissors can be greatly improved critical load, and the middle level of scissors to enhance the role of critical load limited. Erection parameters in the literature [9] nonlinear analysis method used to calculate some of the variables erection capacity limit, but no major erection of some other variables, such as the level of the top-Ligan excess of the limit load length the impact of, and the top model Ligan more displacement constraints, and the actual situation of access to a certain extent; literature [7] space will be just as Falsework framework erection of the main parameters of the critical load, and The literature [10] scaffold for the ultimate strength estimation method for calculating the results of the amendment.
In short, in the impact of ultra-high Falsework ultimate strength of the three main factors, in regard to the first factor, has concted a comprehensive study structural measures had some quantitative and qualitative research results and the third most important factor, But there are many studies to be done.
Given the template stent study the status quo, this study erection parameters and structural measures on the high Falsework fastening limit the impact of capacity, and provide a reasonable formula for calculating the limits of capacity.
Structural measures and the erection 2 parameters on the characteristics of Instability
Falsework instability damage to the damage from the elastic stability of the instability that features (refer to the critical buckling load, and modal) is a limit on the basis of capacity. Elastic Stability Analysis of the structure does not consider the initial defects, structural failure occurred when suddenly from the current position of equilibrium balance Skip to another location, critical buckling load structure for the minimum load, corresponding with the structure deformation shape Modal for instability.
In this paper, using ANSYS proceres are completed, the linear beam element simulation stent bar. Ligan in the bottom of the displacement constraints imposed three in the top of stents, at 1.40 on the level of two-way Ligan vertex imposed constraints to consider stent top and Timber Beam friction between the role of the bar and Weigan the rectangular fastener, a semi-rigid, torsion spring used to simulate. According to the literature [8], we can see that the torsional rigidity of qualified fastener on the critical load limited impact, the paper fastener qualified from the torsional rigidity interval [11] in the middle of 400 cattle • m / degrees as a torsional spring stiffness.
