Study On The Influence Of Pipeline's Arrangement Form In Laminated Layer On Laminated Slab Bearing Performance

Prefabricated and reinforced concrete structure is one of the important development direction of building structure in our country,and the prefabricated construction floor system basically uses the form structure of composite plate,which has saved a lot of templates and human consumption comparing with the cast-in-place floor.In the actual construction,however,the section hole cased by the buried pipeline in the laminated layer can not be avoided,which has a certain effect on stress of the floor structure,but in the process of structure design,the influence on floor system stress caused by the pipeline that weakened the cross section of the concrete was ignored.Through the static loading test and finite element analysis,this paper made a research on the laminated slab of the embedded pipeline,analyzing its bearing performance(bearing capacity,deflection,crack and failure pattern)and stress mechanism.The following works were mainly carried out and the conclusions are obtained:1.Consulting a large number of domestic and foreign literatures related to the composite members,arrange and summarize the research status of the laminated slab at home and abroad,and making brief introduction of them.2.By comparing four groups of laminated slab(the first group did not contain the pipeline,and the other three groups which buried in the post-cast layer were respectively along the cross direction,the vertical plate direction and with 45 degrees of inclined to the layout of the laminated slab),the research analyzed the influence of different direction of the buried pipeline on the bearing performance of the laminated slab.The experiment has proved that the laminated slab containing the pipeline had a greater influence on its flexural capacity,and if the pipeline was arranged along the slab direction,it had least weaken degree of the pipeline on the bearing performance of the laminated slab.If the pipeline was arranged to cross the slab direction,it had the largest weaken degree of the pipeline on the laminated slab;if the pipeline was in a slant direction,the bearing performance of the pipeline on the laminated slab was in a middle degree.3.The ABAQUS finite element analysis software was used to simulate four groups of laminated labs.According to the calculation results,the result of the finite element simulation was more consistent with the test result.By using the original and reliable finite element simulation parameter,this paper simulated that the pipeline was arranged in different height and test the bearing performance of the laminated slabs.The simulation results showed that it had small influence on the bearing performance of the laminated slab when the pipeline was buried far from the edge of the compression zone.4.According to the test and theoretical analysis,this paper calculated the flexural capacity of the embedded pipeline's laminated slab.From the analyzing result of the static test and numerical simulation,the influence of the tense pipeline on the slab's bearing capacity and stiffness is obvious.Therefore,in the structure design,it is suggested that the designer should consider the reduction of the bearing capacity or adopt some measurements to reduce the influence(such as to switch to steel pipe,let the pipeline far away the edge of compressive zone,etc.).This research has deepened the recognition of the bearing performance of reinforced concrete's laminated slab,which has important reference value for practical engineering.Finally,on the basis of the analysis and discussion of this experiment,the paper gave an outlook on how to reduce the influence of pipeline onthe bearing performance of laminated slab.