地震作用下全浮漂大跨斜拉桥耗能减震控制研究
发布时间：2018-07-22 10:49
【摘要】：以某实际全浮漂大跨斜拉桥为研究应用对象,探讨了全浮漂大跨斜拉桥阻尼器的布置原则,考虑桩-土的相互作用,建立了全桥空间有限元分析模型,针对该非比例阻尼体系,通过基于应变能理论的振型阻尼分别考虑上部结构阻尼、下部结构阻尼和阻尼器阻尼,从而实现结构不同部分不同阻尼引入到有限元分析模型。然后进行了黏滞阻尼器参数优化,得到了最优阻尼系数和最优阻尼速度指数,并进行减震效果分析。研究结果表明:采用黏滞阻尼器可有效控制结构的地震响应,主塔顶位移、主梁位移和主塔底弯矩分别减小为普通全浮漂体系的60.4%、56.7%、71.8%;随着阻尼系数增加和阻尼速度指数的减小,梁端位移、塔顶位移和阻尼器位移减小,主塔墩底弯矩单调减少,当阻尼系数增加和阻尼速度指数的减小到一定值时主塔墩底弯矩控制效果基本稳定。
[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.
【作者单位】： 广州大学减震控制与结构安全国家重点实验室(培育);
【基金】：国家自然科学基金重点项目(U1334209);国家自然科学基金项目(51478131,51408142) 国家重点基础研究发展计划(973)项目(2011CB013606) 广州市珠江科技新星项目(2014J2200058) 国家留学基金委公派博士后项目(201208440216)
【分类号】：U442.55
[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.
【作者单位】： 广州大学减震控制与结构安全国家重点实验室(培育);
【基金】：国家自然科学基金重点项目(U1334209);国家自然科学基金项目(51478131,51408142) 国家重点基础研究发展计划(973)项目(2011CB013606) 广州市珠江科技新星项目(2014J2200058) 国家留学基金委公派博士后项目(201208440216)
【分类号】：U442.55
【参考文献】
相关期刊论文 前3条
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