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拆装式公路钢桥跨中挠度,包括弹性挠度和非弹性挠度两部分。弹性挠度可用材料力学公式求出,而非弹性挠度则与加工精度有关,若桁架加工精度要求严,销孔精度高,销与孔间的间隙小,非弹性挠度的数值就小,反之则大。非弹性挠度的计算公式较多,利用这些公式计算的结果,相差很大,有的甚至差几倍,所以,在计算拆装式公路钢桥跨中非弹性挠度时,究竟选用哪个公式计算比较符合实际情况,是首先要考虑的问题。从我们架设艾克罗桁架桥的实测,以及利用艾克罗桁架桥非弹性挠度经验公式计算的结果看,用艾克罗桁架桥跨中非弹性挠度计算公式,比较符合该桥的实际情况,因实测数据与计算数据非常接近。现将艾克罗桁架桥跨中非弹性挠度公式,介绍如下: 桥梁由奇数节组成时:跨中挠度f_0=d/2(n~2-1)桥梁由偶数节组成时:
Disassembly highway steel bridge mid-span deflection, including elastic deflection and non-elastic deflection in two parts. The elastic deflection can be obtained by the mechanical formula of the material, while the non-elastic deflection is related to the machining accuracy. If the truss machining accuracy is strict, the pin hole precision is high, the clearance between the pin and the hole is small, the value of the inelastic deflection is small, . The calculation formulas of inelastic deflection are more, the results calculated by these formulas are quite different, and some are even several times worse. Therefore, when calculating the inelastic deflection of disassembly highway steel bridge, which formula is used to calculate and compare Meet the actual situation is the first question to consider. From the measurement of erecting truss bridge and the empirical formula of inelastic deflection of Electra truss bridge, the calculation formula of inelastic deflection of mid-span of Electra truss bridge complies with the actual situation of this bridge, Due to the measured data and calculated data is very close. The current Elastic truss bridge span inelastic deflection formula is described as follows: When the bridge is composed of odd-numbered section: mid-span deflection f_0 = d / 2 (n ~ 2-1)