| The transmission tower line is a carrier of power conveying.It is an important lifeline engineering.In order to ensure the safety of the transmission line under the action of the earthquake,it is necessary to evaluate the seismic performance.At present,the transmission tower-line system still lacks reliable simplified analysis models during the analysis of the earthquake resistance time;in the analysis of static bullet plasticity,it is usually only considered by the power transmission tower,and the negative(ground)line of the transmission tower seismic anti-seismic anti-seismic resistance The impact of performance,when establishing a Pushover analysis model,often uses a two-dimensional collateral quality point model,and lack of three-dimensional Pushover analysis model.In this thesis,the simplified seismic analysis model and the static elastic-plastic seismic analysis of the transmission tower-line system are studied,and the two-wire model and the concentrated particle model are established.The one-tower two-line model is suitable for seismic dynamic time-history analysis and the concentrated particle model is suitable for static elastoplastic analysis.Secondly,based on the simplified centralized particle model,the Pushover analysis is carried out for the two main axes of the two transmission lines,and the seismic capability curves are established.According to the seismic capability curves,the seismic performance of the transmission tower is divided into five levels and the corresponding quantitative evaluation model is established.Then the capacity spectrum method is used to analyze the lateral and longitudinal seismic response of the two transmission lines,and the capacity spectrum curve and demand spectrum curve of the two transmission towers are drawn,and the structural performance points of the transmission towers are determined and their seismic performance is evaluated.Finally,the reliability of the simplified model and the capability spectrum method is verified by the dynamic time history analysis method.The analysis results show that the error of seismic response analysis is smaller when the concentrated particle model is used instead of the three-tower and four-line model.The proposed method can be used to analyze the seismic performance of transmission tower-line system.The main content is as follows:(1)By seeking guidance(ground)line rigidity,the transmission tower-line system and two-line seismic simplified analysis model is established.And compare the modal and dynamic timing of the model and the dynamic time to verify the reliability of the model.(2)Based on the analysis method of static elasticity and combined with finite element analysis software,a concentrated mass point model of the transmission tower-line system is established.This model takes into account the impact of the quality of the transmission tower’s transmission line and the geometric distribution of the long cantilever’s horizontal burden.It can analyze the anti-seismic performance analysis of the high-voltage power transmission tower-wire system side and vertical direction,respectively.(3)Based on the concentrated mass point model proposed,the two types of transmission lines are analyzed multi-directional Pushover to obtain its vertex displacement-base shear relationship curve;then according to the corresponding relationship between the control indicators and the seismic performance,the shock resistance performance of the transmission tower is divided into five five to five.Level and establish a corresponding quantitative evaluation model.(4)Aiming at the transmission tower-line system,an evaluation method of seismic performance based on the ability spectrum-based method is adopted.According to the category and defense intensity of the power transmission tower,the design reaction spectrum is converted into a demand spectrum,and then the capacity curve and demand curve of the transmission tower are drawn according to the ability spectrum method to determine the performance point of the transmission tower structure,and then evaluate its seismic performance.(5)Verify the ability spectrum method of the power timing analysis method.The analysis results show that the analysis of the ability spectrum method analysis and time analysis results have good consistency and meet the requirements of engineering accuracy.In order to ensure that the results obtained are more reliable,the transmission tower-line system should adopt a variety of side load distribution mode when multi-directional Pushover.When the side analysis is used,the SRSS distribution mode should be given first.The vertical analysis should be given priority. |
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