Numerical Analysis Of Load Transfer And Distribution Of The Multi-storey Formwork Supports System

With the development of construction technology and the acceleration of the project progress, it has been the trend that concrete should be made before the following concrete structures reach the design strength. Thus, multi-storey formwork supports system has been applied to make construction more efficient, the construction period is one story per week generally. But collapses of supports system happen during the period of construction because of unsuitable configuration of supports system and insufficient strength of early-age concrete. Therefore, the research of multi-storey formwork supports system is significant to the safety of construction and the reduction of construction period.In the multi-storey formwork supports system, the dead load of new concrete and the load should be transferred to following floor by formwork supports. The construction load will be bore by time-dependent concrete structure and formwork supports system in every period. The concrete performance of this time-dependent system have relations with the construction period, that is to say, the inner force varies from time to time.Based on the analysis of multi-storey formwork supports system, the ANASYS numeric analysis model is proposed and the construction process of concrete building is simulated. The paper obtains the inner force of multi-storey formwork supports system in different construction periods and with the increasing age of concrete and make sure the system is changing with the time. At the same time, the influence of the uneven subsidence foundation to upper multi-storey formwork supports system is analyzed.The results of the study show that:The internal force of multi-storey formwork supports system is reduced gradually with the increasing age of concrete, the peak internal force occurred when the new floor just completed casting concrete; In the same layer, the internal force at beam bottom is big and the peak internal force occurred near the cloum, the internal force at slab bottom is small and the peak internal force occurred near the beam; The internal force of multi-storey formwork supports system is changed greatly with the reduction of construction period. The formwork supports were supported on the hard foundation, the axial force is consistent on the basic is consistent, the maximum axial force maximum is occurred in close to the edge across. Part of the formwork supports were supported on the backfilling ground, the maximum axial force maximum is occurred in close to the edge across. The axial force near the edge of the cross increased dramatically. Part of the axial force reduced.