Bridge construction shed frame chipping impact force prediction method

Abstract

The invention discloses a bridge construction shed frame chipping impact force prediction method, which comprises the following steps that 1, calculating the mass m1 of a construction shed frame, andtesting the displacement di of different positions of the shed frame under the action of the same load mcg, wherein i is a test point label; 2, calculating the rigidity Ki of a test point according toa test result in the step 1; 3, determining the mass m0 of the maximum object which may fall off on site; 4, calculating the maximum impact force Fmax possibly borne by the shed frame. According to the invention, the problems that the impact force cannot be determined and the construction safety cannot be guaranteed in the use process of the construction shed frame are solved, so that the construction shed frame can be designed based on the impact force, and the shed frame structure is more scientific and reasonable.

Description

technical field [0001] The invention relates to bridge engineering, in particular to a method for predicting the impact force of falling blocks of bridge construction scaffolding. Background technique [0002] After a large number of reinforced concrete bridge decks have been in service for a long time, due to vehicle loads, aging and other reasons, the bridge decks need to be repaired or replaced to keep the bridge in use. For example, 67% of steel bridges in Japan require their decks to be replaced due to failure of concrete decks. In the process of bridge construction, it is often necessary to erect a construction scaffold, which provides a working platform for workers to construct and place equipment. At the same time, because it prevents heavy objects from falling directly under the bridge, the safety of traffic under the bridge is guaranteed. It can be seen that construction scaffolding plays a vital role in bridge maintenance. However, damage and destruction of con...

AI Technical Summary

Problems solved by technology

The formula for calculating the impact force is given in the Eurocode (BS EN 1991-1-7): F=v r ×(km) 0.5 , where v r is the velocity of the object in the impact, k is the equivalent elastic stiffness of the object, and m is the mass of the colliding object; however, this formula does not consider the difference in the structure of the construction scaffold itself, so the impact force obtained by this formula is not accurate

The calculation of impact load in material mechanics assumes that the weight moves together with the impacted component, assumes that there is no energy loss during the impact process, and ignores the mass of the impacted component. Under these assumptions, the calculation of the impact force is too ideal, and The actual situation does not match, so the calculated impact force is inaccurate

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