Research On The Mechanical Performance Of A Reinforced Concrete Archaized Building Structure

This paper chooses a unique,complex structure of hard top reinforced concrete antique buildings,using the current mainstream structure design software Midas series structure finite element model is established,refer to the relevant specifications,design of reinforced concrete structures on the static analysis,the key of the finite element analysis model to implement more than met the conditions of the earthquake and the rarely met earthquake seismic performance analysis,studies the mechanical performance of the structure of the type,structure analysis whether there is the weak point and focus of structure design,finally the commonness of the class structure,an d puts forward some feasible design proposal.Main work and research ideas completed in this paper:1.Main work:(1)First,a Midas/gen finite element model was established to analyze the internal force effect and deformation of the structure under various static load conditions.By referring to the current design specifications of concrete structures,it was discussed whether there should be places that need attention and can be optimized in the design process of this type of structure.(2)Secondly,the stress and deformation of the structure in the elastic state of small earthquakes are studied,and the performance indexes are analyzed to see whether the y meet the limit requirements of the current code for general reinforced concrete structures,and whether there are weak points of stress and deformation.(3)Finally,with reference to the code for seismic design of building structures and other relevant codes,the seismic analysis method of Pushover is adopted to simulate the seismic response of structures when they encounter rare earthquakes in area 7.2.Main research conclusions:(1)On the structure self-weight of the reinforced concrete archaistic building,the roof system frame occupies a large proportion in the overall frame of the structure,and the vertical mass distribution is relatively uneven,showing the characteristics of "top-heavy".Through the author's simple layer definition of the structure,it is found that the floor stiffness is not concentrated in the bottom regular frame,but in the floor with short columns in the roof system,the stiffness of other floors decreases accordingly,and the overall lateral stiffness of the roof is stronger.(2)Due to the archaized design of the building,there are many short columns or even very short columns in the roof system of the hard hilltop type reinforced concrete archaized building,which will have a negative impact on the seismic performance of the structure.In order to improve the seismic performance of the structure,some design and structural measures are put forward for adjusting the ratio of column shear to span according to the relevant current structural design codes.(3)More severe earthquake cases,the structure of the maximum internal force mainly appears in the first layer of the beam,column,and node within the short column component parts appear on the second floor,the structure of the maximum Inter-layer displacement Angle at 1/7611,1/550,far less than the standard limit that hard top roof antique buildings of reinforced concrete structural lateral stiffness is good,have enough ductility reserves,can satisfy the multiple deformation performance under severe earthquake and seismic performance.(4)in the case of rare earthquake,the displacement Angle between the first layers of the structure under four load conditions is close to the standard limit,indicating that the first layer is a weak layer.Some collapse hinges(E hinges)appear on the column members in the first and second floors,when these members have lost their bearing capacity and are close to or have collapsed.It shows that the structure may not be able to meet the seismic fortification requirements of "big earthquake can not fall".In general,this case of the hard of the peak with conventional reinforced concrete antique buildings have good seismic performance of reinforced concrete structures,although the weak parts of the structure has some,but by the finite element software simulation,fully meet the "small earthquakes not bad,the repairable" fortification requirements(seismic response has been simulated under the earthquake resistance meet the requirements,not in the paper),at the same time,in the face of fortification intensity of 7 or more rarely met earthquake also have certain ability to resist,but the structure of the first layer and the existence of short column weak layer does not rule out the possibility of component serious will happen even structure collapsed.This paper suggests that: if not necessary,this type of structure,especially the multiple composite roof and the large slope of the hard hilltop reinforced concrete antique building to avoid the construction of some earthquakes frequent and strong magnitude of the region,otherwise serious property losses and casualties.