Method for preventing progressive collapse of high and large formwork support

Abstract

The invention discloses a method for preventing progressive collapse of a high and large formwork support. The method comprises the following steps of: 1) modeling the high and large formwork support; 2) applying simulated loads to a model of the high and large formwork support; 3) calculating instability coefficients I corresponding to defects of the high and large formwork support; 4) adding auxiliary measures and recalculating instability coefficients II; and 5) comparing the instability coefficients I with the instability coefficients II. According to the method, the stress characteristics of a formwork support system during a construction period can be analyzed by modeling, and after calculation, the overall stress and the progressive collapse resistance of the formwork support are analyzed, and then improved technical measures on design and construction of the formwork support are provided. After the auxiliary measures are applied, the instability coefficients in the presence of the defects are recalculated, and then whether the auxiliary measures are effective or not is judged by comparing the instability coefficients in the presence of the defects with the instability coefficients when the auxiliary measures are not applied, so that the application of the auxiliary measures is guided, and the high and large formwork support is prevented from collapsing.

Description

technical field [0001] The invention relates to the field of building mechanics, in particular to a method for preventing continuous collapse of tall templates. Background technique [0002] A large number of statistical data show that the safety of the structure during construction is far less than the safety of the service period. Taking the United States as an example, about 57% of engineering damage accidents occur in the construction stage; in Russia, this ratio is about 70%, and it is more prominent in my country. Ye Yaoxian analyzed 285 large building structure collapse accidents in China between 1958 and 1987 The analysis conducted shows that 83% of the safety accidents occurred during the construction period, and according to the statistics of 357 collapse accidents in the past 10 years, 78% of the accidents occurred during the construction stage, and most of the structural collapses were caused by the formwork support system. collapse. [0003] Through the analysis...

AI Technical Summary

Problems solved by technology

First of all, when the formwork support frame acts, the cast-in-place reinforced concrete structure contains concrete components that are still in a young age, and the mechanical properties of the concrete have not yet matured. As the age of the concrete increases, the resistance and internal forces of the entire structure will change. Moreover, in the formwork support system with large span and large floor height, the stiffness of the support frame is not infinite; secondly, there is a spatial correspondence between the formwork support frame and the reinforced concrete structure, which constitutes the relationship between the formwork support and the main structure. However, the structure failed to form a complete load-bearing system before the construction was completed; moreover, the load distribution during the construction stage was very complicated, and the load effect of the load on the structure during the construction period and the load effect of the structure during the service period were also different; Various human errors in the construction stage are also an important reason for frequent accidents in the formwork support structure system during the construction period

The limitations of these objective conditions and human factors in the construction process lead to a higher probability of failure of the building structure during the construction period than during the normal use period.

[0006] The auxiliary structural measures added in the current construction plan of tall formwork supports are based on customary safety considerations, and no consideration has been given to whether the added structural measures will play their due role on tall formwork supports

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