Study On The Design And Application Of New Modular Element Truss Roof Formwork Support System

The construction formwork support system is an important part of the cast-in-place concrete structure construction.The manufacture and installation of the formwork support system and its technological level directly affect the quality of the concrete structure and its components,the project cost and the project construction progress.At present,there are many problems in the traditional formwork support system,such as complex erection technology,uncontrollable safety quality,low construction efficiency and long construction time.This paper introduces a new type of modular unit truss roof formwork support system and its construction technology.In view of the floor support part of the new formwork support,the design checking calculation is carried out,and the theoretical analysis calculation,finite element simulation and static load test under the limit state of normal use are carried out around its main stressed structure,the element splicing truss beam.The main work is as follows:1.The structural design and calculation of the floor support part of the new formwork support system are carried out,the specific dimensions of each component are determined,and the rationality of the design scheme is verified by theoretical calculation.2.On the basis of theoretical calculation,the finite element analysis software ABAQUS is used to simulate the main stressed structure,the element splicing truss beam under different spans.The results of theoretical analysis are verified by analyzing the deflection value and stress-strain relationship in the midspan.3.In this paper,the static loading tests are carried out on the spliced truss beams with different spans and pin shafts of different diameters.The influences of the mid span deflection of the spliced truss beams,the stress-strain of each measuring point and the design gap in the male and female joints on the mid span deflection of the spliced truss beams are analyzed under the limit state of normal use.The experimental data are compared with the results of the finite element simulation,and the correctness of the finite element modeling method of the spliced truss beam is verified.4.The theoretical design calculation,finite element simulation and confirmatory test results are compared and analyzed.The results show that they meet the requirements of relevant national construction specifications.The feasibility and safety of the floor support for engineering application are preliminarily verified.At the same time,the safety reserve of the element truss is large and conservative,so the steel consumption of the element truss can be further optimized.5.Finally,the economic and social benefits of the new formwork support system are analyzed,and the cost and labor duration of the new formwork support system are compared with that of the traditional full hall fastener type steel pipe support.Some suggestions are put forward for the follow-up study of the new formwork support system.The conclusion of this paper can provide some theoretical basis and data support for the follow-up development and application of the new template support system.