张弦桁架结构是一种由刚性构件上弦、柔性拉索、中间连以撑杆形成的混合结构体系。

Abstract: The non-prop platform canopy in Xuzhou railway station, is a truss string structure. The system is combined by steel pipe truss beam, struts and cables.

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张弦梁结构是通过撑杆连接上弦抗弯受压刚性构件和下弦高强度拉索而形成的一类新型大跨度结构体系。

The Beam String Structures(BSS), using bar connecting arches and cables, is a new type of long-span structures.

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根据不均匀的焊接温度场和施焊时焊接构件的刚性条件，可以认为焊接残余变形和残余应力是不可避免的。

According to the asymmetry welding temperature fields and the rigidity of component when welding, we could think it is inevitable that welding would bring remains-strain and remains-stress.

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