Seismic Performance And Countermeasures Research Of Existing Frame Structures After Earthquake Action Increases

Since June 1,2016,China began to implement a new seismic zoning map,which has increased the seismic effect in some areas.Near-field effect should also be taken into account in building structures with a certain distance from the seismogenic fault,and the seismic effect will be further enhanced.The seismic performance analysis of all kinds of buildings can reasonably evaluate the seismic resistance of buildings.If buildings do not meet the relevant requirements of seismic resistance,effective reinforcement measures must be implemented to improve the seismic performance of buildings.Frame structures are widely used in practice.Whether they can avoid the seismic risk stipulated at present and which economical and effective reinforcement methods should be adopted to improve the seismic performance and service life of frame structures are urgent problems to be solved.Taking an 8(0.2g)degree fortified frame structure in Tangshan City as an engineering example,the model is built by YJK software,and the actual reinforcement and related parameters are input for calculation and analysis.The key points of seismic performance evaluation and seismic reinforcement of the frame structure under two conditions of 8(0.30g)degree without considering near-field effect and 8(0.30g)degree without considering near-field effect are studied.Conventional analysis software can be used to check the bearing capacity and deformation,then Pushover method can be used to supplement the performance analysis.According to the degree of construction difficulty,the workload of reinforcement and the cost of construction,the suitability evaluation of the reinforcement methods can be made.Finally,the optimal reinforcement measures are selected to carry out the necessary seismic reinforcement.The comprehensive reinforcement method of box steel tube bracing combined with traditional reinforcement method can also be used.The box-type steel tube bracing can effectively reduce the inter-story displacement angle of the frame structure and has good energy dissipation capacity.Figure 87;Table 75;Reference 44...