【摘要】：以某實際全浮漂大跨斜拉橋為研究應(yīng)用對象,探討了全浮漂大跨斜拉橋阻尼器的布置原則,考慮樁-土的相互作用,建立了全橋空間有限元分析模型,針對該非比例阻尼體系,通過基于應(yīng)變能理論的振型阻尼分別考慮上部結(jié)構(gòu)阻尼、下部結(jié)構(gòu)阻尼和阻尼器阻尼,從而實現(xiàn)結(jié)構(gòu)不同部分不同阻尼引入到有限元分析模型。然后進行了黏滯阻尼器參數(shù)優(yōu)化,得到了最優(yōu)阻尼系數(shù)和最優(yōu)阻尼速度指數(shù),并進行減震效果分析。研究結(jié)果表明:采用黏滯阻尼器可有效控制結(jié)構(gòu)的地震響應(yīng),主塔頂位移、主梁位移和主塔底彎矩分別減小為普通全浮漂體系的60.4%、56.7%、71.8%;隨著阻尼系數(shù)增加和阻尼速度指數(shù)的減小,梁端位移、塔頂位移和阻尼器位移減小,主塔墩底彎矩單調(diào)減少,當阻尼系數(shù)增加和阻尼速度指數(shù)的減小到一定值時主塔墩底彎矩控制效果基本穩(wěn)定。
[Abstract]:Taking a practical fully floating long-span cable-stayed bridge as the application object, the layout principle of the damper of the full-floating long-span cable-stayed bridge is discussed. Considering the pile-soil interaction, the spatial finite element analysis model of the whole bridge is established, aiming at the non-proportional damping system. The damping of superstructure, substructure and damper is considered by the modal damping based on strain energy theory, so that different damping of different parts of the structure can be introduced into the finite element analysis model. Then the parameters of viscous dampers are optimized and the optimal damping coefficient and damping velocity exponent are obtained. The results show that the viscous damper can effectively control the seismic response of the structure. The displacement of the top of the main tower, the displacement of the main beam and the bending moment of the bottom of the main tower are reduced to 60.4 and 56.7 and 71.8 of the ordinary floating drift system, respectively, with the increase of the damping coefficient and the decrease of the damping velocity index. The beam end displacement, tower top displacement and damper displacement decrease, and the bending moment at the bottom of the main tower pier decreases monotonously. When the damping coefficient increases and the damping velocity index decreases to a certain value, the control effect of the bending moment at the bottom of the main tower pier is basically stable.
【作者單位】： 廣州大學(xué)減震控制與結(jié)構(gòu)安全國家重點實驗室(培育);
【基金】：國家自然科學(xué)基金重點項目(U1334209);國家自然科學(xué)基金項目(51478131,51408142) 國家重點基礎(chǔ)研究發(fā)展計劃(973)項目(2011CB013606) 廣州市珠江科技新星項目(2014J2200058) 國家留學(xué)基金委公派博士后項目(201208440216)
【分類號】：U442.55

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本文編號：2137194