【作者】 张美珍； 林锦滔； 夏樟华； 宗周红；

【Author】 Zhang Meizhen,Lin Jintao,Xia Zhanghua,and Zong Zhouhong (College of Civil Engineering,Fuzhou University,Fuzhou,Fujian,350108)

【机构】 福州大学土木工程学院；

【摘要】 以福泉厦漳高速公路改扩建工程的金厝中桥拓宽为背景,建立全桥有限元模型,通过计算自重、汽车荷载、新旧桥不均匀沉降作用下原有桥梁(原桥)和新建桥梁(新桥)的主梁以及连接接缝的受力性能;分析比较了20cm和25cm两种接缝高度,桥面连续、准连续和连续三种纵向结构形式以及20和45度两种斜交角度等参数对拓宽桥梁承载能力的影响。结果表明:随着斜交角度的增大,新桥和原桥主梁跨中弯矩减小,但支座剪力增大,表现出更为不利的受力性能:在20m预应力混凝土空心板梁桥拓宽的设计中,应该采用准连续或结构连续构造,并采用25cm以上高度的纵向连接接缝可满足结构承载能力要求。更多还原

【Abstract】 As an engineering background of the widening construction of Jincuo middle bridge in the line of Xiazhang expressway,the finite element model of the whole bridge is established.The mechanical property of main beam of the existing bridge and the new bridge,as well as connection joints under the action of deadweight, vehicle load,and the load from differential settlement between the existing and new bridge is calculated,and also the impact on load carrying capacity of the broaden bridge from different parameters are analyzed and compared, including 20cm and 25cm height connecting joints,three longitudinal jointing types containing bridge deck continuous,quasi-continuous and continuous structure forms,as well as 20 and 45 degree oblique angles of bridge. The results show that the more disadvantageous performance of the bridge appears in bigger oblique angle,with the skew angle increases,the mid-span moment of the new bridge and exiting bridge reduces and bearing shear increases.In the connection joints design of 20m prestressed concrete hollow plate bridge,the quasi-continuous or continuous structure,and the 25cm height connecting joints should be adopted in order to meet the bearing capacity requirement.更多还原