本文選題：高速鐵路橋梁　切入點：地震響應　出處：《中南大學》2014年碩士論文

【摘要】：摘要：隨著設計要求的提高,傳統(tǒng)的鐵路橋墩簡化抗震計算方法和彈性反應譜分析方法已不能滿足強震地區(qū)橋梁的抗震設計要求,開展更為復雜的彈塑性動力時程響應分析和延性抗震設計已迫在眉睫。數(shù)值模擬是橋梁地震響應研究的主要方法之一,本文以大連市某橋梁為依托,開展抗震彈塑性分析方法的關鍵技術研究。論文主要工作如下： (1)地震作用分析方法研究。總結鐵路規(guī)范的簡化算法、振型分解反應譜法和基于纖維模擬的彈塑性時程分析方法計算原理,進行橋墩截面離散化和纖維網(wǎng)格劃分。 (2)多遇地震力作用下鐵路連續(xù)梁地震響應規(guī)律及設計方法研究,通過對橫向和縱向多遇地震作用下簡化算法、反應譜法和彈性時程分析法的計算結果進行對比分析,得出結論：在多遇縱向地震作用下,三者結果相差不大；多遇橫向地震作用下,三種方法中,時程分析法和反應譜法的差異在2.6%以內(nèi),簡化算法與反應譜法相比計算結果偏小,相對差異在11%-19%,建議盡可能的采用反應譜法或時程分析法進行計算。 (3)罕遇地震力作用下鐵路連續(xù)梁地震響應規(guī)律及設計檢算方法研究,通過對縱向作用和橫向作用兩種工況下反應譜法、彈性時程分析法和彈塑性纖維時程分析法計算結果進行對比分析,發(fā)現(xiàn)結果相差較大,采用彈性模型會嚴重放大墩底的彎矩,用于設計時會增加橋墩截面積和配筋量。得出結論：罕遇地震下采用彈塑性時程法可以更合理地模擬結構的塑性工作狀態(tài),建議在設計過程中采用彈塑性模型進行計算。
[Abstract]:Absrtact: with the improvement of design requirements, the traditional simplified seismic calculation method and elastic response spectrum analysis method for railway piers can not meet the seismic design requirements of bridges in strong earthquake areas. It is urgent to develop more complex elastoplastic dynamic time-history response analysis and ductile seismic design. Numerical simulation is one of the main methods of bridge seismic response research. The main work of this paper is as follows:. This paper summarizes the simplified algorithm of railway code, the mode decomposition response spectrum method and the calculation principle of elastic-plastic time-history analysis method based on fiber simulation, and carries on the section discretization and the fiber mesh division of the bridge pier. The seismic response law and design method of railway continuous beam under the action of frequent earthquake force are studied. The calculation results of simplified algorithm, response spectrum method and elastic time-history analysis method under the action of transverse and longitudinal frequent earthquakes are compared and analyzed. It is concluded that under the action of longitudinal earthquakes, the difference among the three methods is not significant, and the difference between the time history analysis method and the response spectrum method is within 2.6%, and the simplified method is less than the response spectrum method in comparison with the response spectrum method. The relative difference is between 11 and 19. It is recommended that the method of response spectrum or time-history analysis be used as far as possible. 3) under the action of rare earthquake force, the seismic response law and design checking method of railway continuous beam are studied, and the response spectrum method under two working conditions, longitudinal action and transverse action, is studied. The results of elastic time-history analysis and elastic-plastic fiber time-history analysis are compared and analyzed. It is found that the results are quite different and the bending moment at the bottom of the pier will be greatly enlarged by using the elastic model. It is concluded that the elastic-plastic time-history method can be used to simulate the plastic working state of the structure more reasonably under rare earthquake. It is suggested that the elastic-plastic model should be used to calculate the structure in the design process.
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U442.55

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