设计顶部弦杆时，应在跨距中间有一临时螺栓铰接。
The top chords will be designed with a temporary bolted splice at mid-span.
人们通过研究发现，这种用高强螺栓连接的节点具有明显的非线性特征，介于刚接和铰接之间。
We discover through research that these joints connected by high strength bolts have obvious nonlinearity which intervene the rigid joints and the hinge joints.
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