本文選題：斜交橋 + 最不利地震響應��； 參考：《北京交通大學》2014年碩士論文

【摘要】：摘要：由于地震作用的隨機性和復雜性,在對結(jié)構(gòu)進行抗震計算時,很難確定地震波準確的輸入方向。斜交橋梁的平面不規(guī)則性導致了彎扭耦合效應,使得最不利地震輸入方向更難以確定。因此深入研究斜交橋在任意角度輸入下多向地震作用反應,提出斜交橋簡化的地震反應計算理論,保證斜交橋在地震中的安全性是非常有意義的。 本文首先綜述了有關(guān)斜交橋最不利地震響應的研究成果；在此基礎(chǔ)上,通過考慮斜度、跨數(shù)以及橋臺碰撞效應等因素建立不同特性的斜交橋有限元數(shù)值分析模型,對斜交橋地震動最不利響應問題展開深入研究。主要研究內(nèi)容和所得結(jié)論如下： 1、采用考慮地震空間效應的水平雙向正交地震輸入方式,通過對不同特性的斜交橋有限元數(shù)值分析模型作基于不同輸入方向的非線性時程分析,研究了地震輸入角度與不同特性斜交橋地震內(nèi)力的關(guān)系：在雙向地震作用下,地震輸入角度對斜交橋上部橋跨位移和墩底地震內(nèi)力影響較大,部分地震響應隨著輸入角度呈近似正余弦規(guī)律變化,相同響應量縱橫向的變化規(guī)律相反。按常規(guī)方向進行時程分析所得響應量的最值與理論計算的最值相差較大,可能會大大低估斜交橋某些響應量值。 2、借鑒目前被國內(nèi)外相關(guān)規(guī)范建議的反應譜分析地震反應組合方法,包括SRSS、100/40和100/30等三種組合方法計算斜交橋最不利地震響應,通過低估概率來評判三種組合方法的安全性,結(jié)合不同角度輸入時程分析,合理提出計算不同特性斜交橋最不利地震響應的簡便方法。 3、基于靜力彈塑性分析方法的思想,提出了通過兩正交方向Pushover結(jié)果進行組合,以合成多角度能力譜曲線,再與折減的需求譜曲線繪制在同一坐標軸中,以模擬斜交橋多角度Pushover分析,探討了不同斜率的斜交橋在多維輸入下的需求-能力關(guān)系。
[Abstract]:Abstract: due to the randomness and complexity of seismic action, it is difficult to determine the accurate input direction of seismic wave in seismic calculation of structures. The plane irregularity of skew bridge leads to the coupling effect of bending and torsion, which makes the direction of the most unfavorable earthquake input more difficult to determine. Therefore, it is very meaningful to study the multi-direction seismic response of the skew bridge under any angle input, and to put forward the simplified seismic response calculation theory of the skew bridge to ensure the safety of the skew bridge in the earthquake. In this paper, the research results of the most unfavorable seismic response of skew bridge are summarized, and based on this, the finite element numerical analysis model of skew bridge with different characteristics is established by considering the factors such as slope, span number and collision effect of abutment. The most unfavorable response of skew bridge ground motion is studied in depth. The main contents and conclusions are as follows: 1. The horizontal and bidirectional orthogonal seismic input method considering seismic spatial effect is adopted. The nonlinear time-history analysis based on different input directions is made for the finite element numerical analysis model of skew bridge with different characteristics. The relationship between seismic input angle and seismic internal force of skew bridge with different characteristics is studied. Under the action of bidirectional earthquake, the influence of seismic input angle on the displacement of the upper bridge span and the seismic internal force at the pier bottom of the skew bridge is great. Some of the seismic responses vary approximately with the input angle, but the variation of the same response is opposite in the longitudinal and horizontal directions. The maximum value of the response obtained by the conventional time-history analysis is quite different from that of the theoretical calculation, and some response values of the skew bridge may be greatly underestimated. 2draw lessons from the response spectrum analysis combination method, which is suggested by relevant codes at home and abroad, including SRSS 100 / 40 and 100 / 30 combination methods to calculate the most unfavorable seismic response of skew bridge, and evaluate the safety of the three combination methods by underestimating the probability. A simple and convenient method for calculating the most unfavorable seismic response of skew bridge with different characteristics is put forward by combining the time history analysis of different angles. 3. Based on the idea of static elastic-plastic analysis, a combination of two orthogonal direction Pushover results is proposed to synthesize the multi-angle capability spectrum curve, and then draw the reduced demand spectrum curve in the same coordinate axis. Based on the multi-angle Pushover analysis of the skew bridge, the demand-ability relationship of the skew bridge with different slopes under the multi-dimensional input is discussed.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U442.55

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本文編號：1867373