The Synergy Mechanism Of Exiting RC Frame With Adding Layers Of Steel Structure And Its Reinforcement Technology

Adding layers transform of existing civil structure is convenient and practical, withexisting RC frame structure steel dowel added layer clear, simple structure, economicaland practical and widely used. However, after adding layers, the existing structure andmechanism of synergy plus layer part system (seismic response, the level ofredistribution of member forces, after connecting node anchoring force transmissionmechanism and structural mechanisms, etc.) there is no perfect design methods andrelated specifications, systematic study yet.In this paper, the research was based on some basic theory (damping values, theimpact of whiplash effect, the dynamic response analysis method) described in floorsteel structure, in order to increase the existing RC frame structure steel layer, forexample, the establishment of spatial analysis model, a combination of structuraldynamic characteristics before and after adding layers and comparative analysis of theexisting architecture, changes in laws and change the original structure of the seismicresponse of member forces and the structure of the old and new structures, such asconnecting nodes. The main work and conclusions are as follows:(1) By adding layers of steel framework of existing RC structures dynamic analysis:①Comparative analysis of dynamic characteristics of response noted: After addinglayer structure becomes soft, the whole cycle becomes longer, for higher orderfrequency-sensitive;②Comparative analysis of seismic response noted: overall weaklayer structure change occurs, may result in the increase of the first layer; additionallayer on the top floor of the maximum displacement of the original structure; time curvevalue increases, the peak delay and increase the duration of the structure around thepeak of the curve. (2) The results of the seismic response spectrum analysis before and after addinglayers of steel RC frame member forces change based on the seismic response analysisof structures showed that:①After the addition, the axial force in the original framecolumn structurally weak layers greatest increases; scissors forces and moments areadded layer adjacent to the floor impact;②only adding layer adjacent to the originalstructure and floor beams impact floors, the largest top-level beam, and the formerthree-beam bending the moment has reduced; single structure with added layers oflayers of smaller beam bending trend has become increasingly smaller.(3) Based on RC frame structure of steel and floor reinforcement component seismicanalysis and proposed corresponding structure damping, reinforcing and componentseismic reinforcement of measures and the later anchoring structure analysis of Thestructure of the old and new connected nodes.