结合桥址处实际工程条件，某跨海大桥主桥选取了286m跨下承式双边钢箱主梁提篮拱桥及（125+286+125）m双塔三跨双索面预应力混凝土梁斜拉桥2种桥型方案进行研究比选；对下承式提篮拱桥方案，提出了4种总体施工方案进行研究比选；设计推荐采用拱轴系数1.5、矢跨比1/5、陀螺形钢箱截面拱肋及双边钢箱主梁的286m跨下承式提篮拱桥，提出采用半潜驳船并利用潮汐差进行拱梁整体浮运架设施工。针对该桥质量大、重心高、高桩承台及场地特征周期长等不利抗震条件，采用球型钢支座及纵向粘滞阻尼器共同进行减隔震，并采用非线性时程法及时域显式降维迭代，分别进行减隔震元器件参数优化及结构抗震分析；计算结果显示，拱桥结构响应对粘滞阻尼器阻尼系数C较敏感，对速度指数 敏感性较小，设置减隔震系统后，梁端的纵桥向位移得到明显控制，降幅达到61.5%，拱肋轴力降低5.7%~19.6%，拱肋弯矩降低8.9%~59.0%，拱脚处内力降幅最大，主桥抗震满足要求。
Abstract
Combined with the actual engineering conditions at the bridge site,two kinds of bridge types were chosen for the main bridge of a sea-crossing bridge: 286m span through double side steel box main girder lifting basket arch bridge and (125 + 286 + 125m) m double tower, three span and double cable plane prestressed concrete girder cable-stayed bridge.For the arch bridge kind,four kinds of overall construction schemes are put forward to study and select, and 286m span through basket arch bridge with arch axis coefficient 1.5, rise-span ratio 1 / 5, gyroscopic steel box section arch rib and bilateral steel box main beam was recommended. The semi-submersible barge under tidal difference are used for the whole arch beam floating and erecting construction. In view of the unfavorable seismic conditions of the bridge, such as large mass, high center of gravity, high pile cap and long site characteristic period, the ball steel bearing and longitudinal viscous dampers are both used for seismic reduction and isolation, and the nonlinear time history method and the explicit dimension-reduction iteration in time-domain are adopted. The results show that the structural response of the arch bridge is sensitive to damping coefficient C of viscous dampers, and less sensitive to velocity index. After setting up the isolation system,the longitudinal displacement of the girder end is obviously under control, the decrease is 61.5%, the axial force of the arch rib is decreased by 5.7% ~ 19.6%, the bending moment of the arch rib is decreased by 8.9% ~ 59.0%, the internal force at the arch foot is decreased mostly, and seismic resistance of the main bridge meets the requirements.
关键词
拱桥 /
桥型方案 /
减隔震 /
粘滞阻尼器 /
时域显式降维迭代
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Key words
arch bridge /
bridge type scheme /
seismic reduction and isolation /
viscous damper /
time-domain explicit dimension-reduction iteration
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