木结构钢填板预应力套管螺栓连接试验

Loading Tests of Prestressed Tube Bolted Joint with Slotted-in Steel Plate

摘要:

针对木结构螺栓连接初始刚度低的问题，提出了一种新连接形式——钢填板预应力套管螺栓连接。在这种连接形式中，张拉后的螺杆使放置于木孔内的套管顶紧钢填板；在节点受力初期，主要利用钢填板与套管间的摩擦力抵抗钢填板相对于木槽的滑移。为研究连接性能，对单个新连接节点以及普通螺栓连接节点进行了抗拉试验，试验结果表明新连接节点具有较好的承载力和刚度，如控制节点受力，节点延性也较合理。另外，考虑到《木结构设计规范》GB5005-2003对销轴类连接节点顺纹端距的严格要求，又对一组端距小于规范要求的单个新连接节点进行了顺纹抗拉试验，试验结果表明小端距的新连接节点承载力和刚度仍优于普通螺栓连接节点；同样，如控制节点受力，节点延性也较合理。

Abstract:

An innovative joint for timber structures, named prestressed tube bolted joint with slotted-in steel plate, has been designed, to improve the low slip modulus of bolted joints. Different from bolted joints, the innovative joints resist the slip of steel plate by the friction between steel plate and tubes which are inserted into timber holes and prestressed by a pretensioned bolt. Loading tests of single innovative joints and single bolted joints in tension were conduct , which indicates that single innovative joints outshine single bolted joints in load-bearing capacity and slip modulus. If the load is controlled, the ductility of joints is also desirable. Considering the great minimum end distance for dowel-type joint specified by Code for design of timber structures GB5005-2003, anther group of single innovative joints with end distance smaller than that required by the code were tested in tension parallel to timber grain, which indicates that innovative joints with smaller end distance are still great in load-bearing capacity and slip modulus, compared with the performance of single bolted joints; if load is controlled, the ductility of joint is also desirable.