Study On Mechanical Properties Of Assembled Composite Floor Support System

Now prefabricated buildings are booming,the state and various provinces have introduced policies that prescribe the prefabrication rate.Since the state does not have relevant regulations for the supporting system of fabricated laminated slabs,there is no support frame specially designed for assembly in the industry.Most of the construction units are experienced construction,and the frame is still installed according to the support of traditional cast-in-place slabs.Low efficiency and high material consumption.In order to avoid the increase of engineering cost caused by the wasteful use of components,In this paper,the mechanical properties of the support system of fabricated laminated slabs are studied.,optimize and improve the support system.In various support systems,fastener-type steel pipe scaffolds account for 70% of the total usage,so this article takes fastener-type steel pipe scaffolding as the research object,using truss-type reinforced concrete laminated floor slab,the cast-in-place layer of the laminated slab is used as the live load and prefabricated layer act as a constant load on the scaffold.The mechanical properties of the fastener-type steel pipe scaffold that under different conditions are studied.The influence of layout on mechanical properties from the height of the sweeping rod from the ground,the torque of the fastener,the choice of single-way floor slab,and the scissors support are analyzed.Firstly,the stability check of the pole is carried out,according to the current national standard.The ultimate load that the pole is stable and withstand can be obtained.Then the stability calculation of the scaffold is reversed according to the mechanical formula,and the scaffolding stands under the premise of ensuring stability and safety.Estimate the maximum spacing of the rods;then,the large-scale finite element software SAP2000 is used to build the simulation model and solve the problems in the modeling process(material and steel tube section definition,force form,node form,initial defects,etc.),and then pass Field experiments tested finite element modeling to ensure the accuracy of finite element results.Finally,the finite element software is used to study the mechanicalproperties of the scaffolding structure under the influence of various parameters.The overall stability of the scaffolding structure is judged according to the buckling factor and the load-displacement curve,and the scaffolding erection is optimized(the height of the sweeping rod should be 0.2-0.4m;The torque of the fastener should be 40-60;the load transfer effect of the two-way floor is better,and the two-way plate should be selected;the maximum spacing of the scaffolding under the three types of cast-in-place slabs without the scissor support is 2.2m.2.1m,2.0m,the maximum spacing between the scissor support is 2.3m,2.2m,2.1m),and the optimized scaffolding cost and the current traditional erection cost are analyzed and calculated,and the cost per square meter is optimized after optimization.It embodies the economic significance of the topic selection.