Study On The Structure System And Mechanical Behavior Of Reactive Powder Concrete Single Storey Industrial Building

The application of reactive powder concrete?RPC?in single-storey industrial building can lower the structural weight,improve the durability and hoisting process,due to its high strength,high durability,high toughness and low creep and shrinkage.Therefore,the present paper proposed a reliable RPC single-storey industrial building structure system according to the a bio-fermented waste drying project plant in Wuhan,Hubei Province,and then investigated the stability,seismic performance of the single-storey industrial building structure?the flexural behavior and shear behavior of RPC beam.The main contents and conclusions are as follows:?1?Structural system and static performance analysis of RPC single-storey industrial building.Determine the section size and reinforcement of the roof beam,the truss column and other components,formulate the static and feasible RPC single-storey industrial building structure system,calculate and analyze the ultimate capacity and normal service limit state of the roof beam and the truss column according to the relevant regulations..The results show that the flexural capacity of the roof beam and the shear capacity of the oblique section meet the requirements of the regulations.The normal use limit state meets the requirements of the regulations;the compressive bearing capacity of the frame section of the frame column meets the requirements of the specification,and the load is quasi-permanently combined.The ratio of the initial eccentricity to the effective height of the section e₀/h₀?0.55,the crack width may not be checked.?2?Stability analysis of the structural system of RPC single-storey industrial building.The finite element model of the 1st to 9thsingle-storey industrial building was established by Midas,and the structural stability of the following five kinds of roof construction conditions was analyzed:the installation of the axle 1 beam of the shaft;the arrangement of the shaft No.2 beam and the shaft No.3 beam.The process of inter-rigid tie rods and horizontal supports;structural stability after completion of roof beams,rigid tie rods and horizontal support arrangements;stability of the process of laying roof panels;stability during use after decking.The results show that the constraint of the x-axis rotation angle between the roof beam and the top of the column will have a great impact on the stability of the roofing system.It is recommended that the temporary support of the facility during the actual construction process should be adopted;when the axle 1 of the shaft is erected,so the crane hooks can't be relaxed before connecting the shaft No.1 beam and the shaft No.2 beam rigid tie rods;the support of the roof panel has a greater impact on the stability of the roofing system,the side should be edged and welded during the laying process.?3?Analysis of seismic performance of RPC single-storey industrial building.Based on the established Midas numerical analysis model,reasonable seismic waves was selected,and the time history analysis method was used to analyze the seismic performance of RPC single-storey industrial building,and than the structural seismic response of structural members under the basic combination was checked according to the"anti-regulation"..The results show that the selection of seismic waves satisfies the requirements of three elements of ground motion?spectral characteristics,time-keeping and effective peak?;the roof beam and the frame column satisfies the seismic response of the cross-section under the basic combination of multiple earthquake effects and other load effects;structural elastic layer The inter-displacement test satisfies the seismic deformation test under the standard combination of multiple earthquakes.?4?Analysis of bending behavior of prestressed RPC beams.The finite element analysis software DIANA was used to establish the single-storey industrial building roof beam model,and the bending performance of prestressed RPC roof beam was analyzed based on the feasibility of model verification.The results show that the finite element calculation results are only 1%different from the ultimate load of the test beam,and the mid-span displacement is only 4%.The model has high precision for analyzing the bending behavior of such I-shaped beam.When the prestressed RPC roof beam analysis model reaches the ultimate load,the concrete in the compression zone is crushed and the steel is yielded,showing good ductility.The ultimate load value is greater than the basic design value of the load and meets the requirements.?5?Analysis of shear performance of prestressed RPC beams.Through the experimental study on the shear behavior of three prestressed RPC box girder,the load-displacement relationship,cracking load,shear bearing capacity and failure mode of the test beam under different shear-to-span ratios are compared and analyzed.The box girder model was established using the finite element software Diana.Based on the established Diana numerical analysis model,the systematic parameters analysis of the oblique bearing capacity of the prestressed RPC box girder was carried out.The results show that with the increase of the shear span ratio,the damage patterns of the test beams are in the form of baroclinic,shear and oblique pull,and the shear capacity is gradually reduced.The calculation results agree well with test results of the Diana finite element numerical analysis model,thus,the model is good enough to be used to analyze the shear behavior of the prestressed RPC beam;the shear capacity of the prestressed RPC box girder increases first and then decreases with the increase of the prestress;When the ratio of compressive stress to concrete axial compressive strength reaches 0.4⁰.5,the shear capacity of the box girder reaches the maximum value;when the ratio of the upper flange edge width to the web thickness of the box girder is less than 7.0,the shear bearing capacity increase with increase of the flange width.When the ratio of the upper flange width to the web thickness is greater than 7.0,the flange flange width and the influence of the flange width on the box beam shear capacity are negligible,although the similar effect of flange width is observed on the box beam and the I-beam,the critical value of the web thickness is 7.0,which is higher than the critical value of the I-beam of 4.0.It can be seen that the shearing effect of the upper flange width of the box girder is better than that of the I-beam.