拱高跨比对拱式转换层受力性能的影响分析

Analysis of Depth-Span Ratio on Mechanics Behaviour in Arch Transfer Floor Structure

针对常用转换层结构的优缺点,提出了一种新型的转换层结构——预应力拱式转换层,并利用有限元方法分析了竖向荷载作用下拱高跨比对该转换层受力性能的影响,结果表明：上、下弦杆截面的设计应考虑轴力的影响,由于下弦杆存在较大的拉力,可在下弦杆施加预应力,形成预应力拱式转换层结构,斜腹杆轴压力较大,可采用钢管混凝土,以改善该构件的受力性能,另外还必须适当控制拱高跨比。经分析,拱高跨比取值范围为0.175-0.35较合理。

In the common transfer story base,the prestressed arch transfer floor is advanced,as a new type of transfer story structure.The effect of the depth-span ratio on mechanics behaviour of arch transfer floor structure is discussed by finite method.It is shown that in the design of upper and bottom chord axial force must be considered.Owing to the high tensile force in the bottom chord,the prestress may be applied in this chord of the structure,and become prestress arch transfer floor structure.As the high axial pressure force in the diagonal web steel tube concrete may be used to improve the mechanics behaviour of this member.It is rational to control the depth-span ratio from 0.175 to 0.35.