本文選題：簡(jiǎn)支梁橋 + 橫向相對(duì)位移　； 參考：《西南交通大學(xué)》2016年碩士論文

【摘要】：調(diào)查表明,在地震作用下,簡(jiǎn)支梁橋橋墩和基礎(chǔ)的損害較小,但橋板和蓋梁之間通常都會(huì)存在橫向相對(duì)移位。當(dāng)橫向相對(duì)位移過大時(shí),可能出現(xiàn)落梁等結(jié)構(gòu)失效情況�，F(xiàn)有的研究主要針對(duì)減隔震支座在橋梁工程中的應(yīng)用,但對(duì)地震作用下橋板滑動(dòng)位移和地震動(dòng)參數(shù)的關(guān)系研究較少。為了研究地震作用下簡(jiǎn)支梁橋橋板和蓋梁間的橫向相對(duì)位移,采用OpenSees軟件建立了1座有代表性的有限元橋梁模型,選取了1394對(duì)同時(shí)含水平和豎向分量的地震動(dòng)錄作為激勵(lì)施加在橋梁模型的橋墩底部,計(jì)算得到橋板的最大相對(duì)位移。根據(jù)計(jì)算結(jié)果,采用隨機(jī)效應(yīng)方法進(jìn)行統(tǒng)計(jì)回歸,建立了三個(gè)經(jīng)驗(yàn)?zāi)Ｐ停耗Ｐ鸵挥脴蛄褐芷�、跨度、震�?jí)、震源距、場(chǎng)地周期、峰值加速度來估計(jì)橋板的最大相對(duì)位移；模型二不考慮模型一的參數(shù)峰值加速度；模型三不考慮模型一的參數(shù)震級(jí)和震源距。通過殘差分析,驗(yàn)證了三類模型的有效性。基于工程的實(shí)用價(jià)值,模型一、二可用于區(qū)域性橋梁設(shè)計(jì),而模型三可用于估計(jì)各個(gè)地震烈度區(qū)橋板的最大相對(duì)位移。分析得出結(jié)論：模型一最為可靠,其余兩個(gè)模型也可以根據(jù)具體條件來選擇使用；基于經(jīng)驗(yàn)公式中其余參數(shù)已知的情況,橫向相對(duì)位移會(huì)隨震級(jí)、場(chǎng)地周期和橋梁周期的增大而增大,隨震源距、摩擦系數(shù)的增大而減小以上模型依據(jù)超越概率可以用于橋梁的可靠度分析,為進(jìn)一步提出基于位移反應(yīng)譜的簡(jiǎn)支梁橋搭接長(zhǎng)度的設(shè)計(jì)提供理論基礎(chǔ)和研究方法,對(duì)橋梁抗震設(shè)計(jì)具有重要意義。
[Abstract]:The investigation shows that the damage to piers and foundations of simply supported beam bridges is relatively small under earthquake, but there is usually a relative lateral displacement between bridge slab and cover beam. When the lateral relative displacement is too large, the failure of structure such as falling beam may occur. The existing researches mainly focus on the application of isolation bearings in bridge engineering, but there is little research on the relationship between the sliding displacement of bridge plate and the parameters of ground motion under earthquake. In order to study the transverse relative displacement between slab and cover beam of simply supported beam bridge under seismic action, a representative finite element model of bridge is established by using OpenSees software. 1394 pairs of ground motion records with both horizontal and vertical components are selected as excitation at the bottom of the pier of the bridge model and the maximum relative displacement of the bridge plate is calculated. Based on the results of the calculation, three empirical models are established by using the stochastic effect method. Model one estimates the maximum relative displacement of the bridge slab by using bridge period, span, magnitude, focal distance, site period and peak acceleration. Model 2 does not consider the peak acceleration of model 1, and model 3 does not consider the magnitude and focal distance of model 1. The validity of the three kinds of models is verified by residual analysis. Based on the practical value of engineering models 1 and 2 can be used in regional bridge design while model 3 can be used to estimate the maximum relative displacement of bridge plates in different seismic intensity areas. It is concluded that the first model is the most reliable, and the other two models can be used according to specific conditions. Based on the known parameters in the empirical formula, the lateral relative displacement will follow the magnitude of the earthquake. With the increase of focal distance and friction coefficient, the above models can be used to analyze the reliability of bridges according to the transcendental probability. This paper provides a theoretical basis and a research method for the design of the lap length of a simply supported beam bridge based on displacement response spectrum, which is of great significance to the seismic design of the bridge.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U442.55

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