地震作用下斜交空心板桥支座竖向受力特性分析及其控制  

Analysis and control of vertical bearing characteristics of skew hollow slab bridge under earthquake

作　　者：梁峰 徐庆超 阎宗尧 赵安安 王阳春 李雪红[2] LIANG Feng;XU Qingchao;YAN Zongyao;ZHAO An'an;WANG Yangchun;LI Xuehong(Shandong High-speed Construction Management Group Co. Ltd., Ji'nan 250014,China;College of Civil Engineering,Nanjing Tech University,Nanjing 211800, China;Shandong High-speed Engineering Testing Co. Ltd., Ji'nan 250002,China)

机构地区：[1]山东高速建设管理集团有限公司,山东济南250014 [2]南京工业大学土木工程学院,江苏南京211800 [3]山东高速工程检测有限公司,山东济南250002

出　　处：《南京工业大学学报（自然科学版）》2021年第6期787-797,共11页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(51778289);山东省交通运输科技计划(2019B33)。

摘　　要：在地震作用下,斜交桥的地震响应特性较正交桥更为复杂。本文运用梁格法研究地震作用下斜交空心板桥支座竖向受力特性,分析斜交角、盖梁刚度、跨径、桥宽以及支座刚度对支座反力分布的影响,并提出控制措施。结果表明:斜交桥的空间扭转效应显著,整体上表现出钝角侧支座反力明显大于锐角侧,且每块空心板亦表现出相同的变化规律,使空心板及铰缝连接区域产生较大剪力,钝角侧支座易发生超压破坏,锐角侧支座则可能产生脱空。支座受力的不均匀性受斜交角的影响较大,且随斜交角的增大而增强,在设计时应尽量避免出现大斜交角。桥宽和跨径的改变对支座空间受力特性亦有一定影响,随桥宽的增大,地震的空间扭转效应影响减弱;随跨径的增大,各轴线支座反力的差值逐渐增大,空间受力特征愈发明显。盖梁高度和跨度的改变对支座反力的分布影响很小,可忽略不计。对于斜交桥,在各板块钝角和锐角侧分别设置刚度较小和较大的支座,可显著改善支座的受力不均,降低各轴线支座反力的差值,不仅可控制支座超压和脱空,而且可有效降低板内和铰缝区域剪力,改善斜交空心板桥的横向空间受力性能。The seismic response of skew bridges is usually more complex than that of straight bridges under earthquake.In this paper,the vertical stress characteristics of bearings were studied for the skew hollow slab bridge under earthquake by grillage method.Meanwihle,the effects of skew angle,capping beam stiffness,span,bridge width and bearing stiffness on the distribution of bearing reaction force were analyzed.Control measures were then put forward according to the ananlysis.Results showed that the spatial torsion effect of skew bridge was significant,and the bearing reaction force on obtuse angle side was obviously greater than that on acute angle side.Each hollow slab presented the same rule,in which the joint areas between hollow slab and hinge beared larger shear force,and overpressure damage happened at the bearings on obtuse angle side,while vacancy may occure at the bearings on acute angle side.The stress distribution of bearing was greatly affected by skew angle and the stress increased with the increase of skew angle.Therefore,large skew angle should be avoided in design.Reserch also showed that the change of bridge width and span had a certain influence on the spatial stress characteristics of bearings.With the increase of bridge width,the spatial torsion effect of earthquake weakened,and with the increase of span,the difference of reaction force of each axis of bearings gradually increased,and the spatial stress characteristics became more prominent.The height and span of capping beam had little influence on the distribution of bearing reaction force,which therefore could be ignored.For skew bridges,setting bearing supports with smaller stiffness on the obtuse side and larger stiffness on the acute side of each plate could significantly improve the uneven stress of supports and reduce the difference of reaction force between supports in each axis.By this method,the void and overpressure of bearings could be controlled,the shear force in the plate and hinge joint area could be effectively reduced,and the la

关 键 词：地震作用 斜交空心板桥 板式橡胶支座 空间受力性能 支座超压和脱空 

分 类 号：U448[建筑科学—桥梁与隧道工程]