锚拉板组合结构受力特性研究

Study on the Mechanical Characteristics of the Combined Structure of Anchors Plate

为研究系杆拱桥吊杆锚拉板组合结构的受力特性,以湖州环漾大桥为背景,对其梁上锚固系统进行实体有限元模拟,首先分析锚拉板系统在设计索力下的受力状态,包括连接件剪力分配比、钢结构应力状态及混凝土应力状态;然后,对其受力特性进行参数化分析。结果表明:①设计荷载作用下,锚拉板、加劲板开孔连接件与端承板连接件三者剪力分配比例约为:46%:33%:21%;②设计荷载作用下,开孔板连接件均处于弹性工作状态,开孔板连接件剪力竖向分布趋势呈现从上至下逐渐减小的趋势,横向分布较为均匀,边列较大;③不设置端承板,连接件最大剪力值略有增加,原端承板剪力主要转移给离端承板近的连接件,使得上、下排剪力分配更为均匀;④不设计开孔板连接件,索力荷载全部由端承板承担,导致锚拉板的受力基本呈现整体均匀受拉的受力状态,其下缘与端承板应力集中更为明显。

In order to study the mechanical characteristics of the combined structure of anchor and tension plate,the anchoring system on the girder of Huzhou Huanyang Bridge was simulated with solid finite element method.Firstly,the stress state of the anchor and tension plate system under the design cable force was analyzed,including shear distribution ratio of connector, stress state of steel structure and stress state of concrete.Then,its mechanical characteristics are parameterized.The results show that:(1)under the design load,the shearing force distribution ratio of anchor plate,stiffening plate,open-hole connector and end bearing plate connector respectively is about 46%:33%:21%;(2)under the design load,the perforated plate connector is in the elastic working state,the shear vertical distribution of the perforated plate connector shows a trend of decreasing from top to bottom,the transverse distribution is more uniform,the side row is large:(3)without setting end bearing plate,the maximum shear force of the connecting piece increases slightly,and the shear force of the original end bearing plate is mainly transferred to the connecting piece close to the end bearing plate,so that the upper and lower shear forces are distributed more evenly;(4)without the hole plate connector,cable load is all borne by the end plate,resulting in the anchor plate stress basically presents the overall uniform tensile stress state,its lower edge and end plate stress concentration is more obvious.