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合理确定露天空间三层钢桁架结构温度区段长度值至关重要。以山西晋北某地区露天管道栈桥桁架结构为研究对象,在现场外观普查和杆件温度应力监测的基础上,选取当地月平均气温和日气温温差对该结构重点进行“结构自重”和“结构自重+温度作用耦合”两种不同工况下的分析。分析结果表明:单独自重工况所产生的最不利杆件应力约占材料强度允许值的5.0%;自重和温度耦合工况作用下,杆件应力达到材料强度允许值的26.7%;现场实测杆件温度应力出现内力变号,可能引起焊接节点疲劳破坏;对不同结构长度的钢桁架结构分析,类似空间钢桁架结构温度缝位置的合理确定应考虑其支座混凝土桥台的影响。
It is very important to rationally determine the length of the temperature section of the three-story steel truss structure in open space. Taking truss structure of open-air pipeline trestle in Shanxi Jinbei area as an example, on the basis of on-the-spot census and temperature stress monitoring, we selected the monthly mean temperature and the temperature difference of temperature on the structure of “ ”Structural self-weight + temperature effect coupling " under two different conditions of analysis. The analysis results show that the stress of the most unfavorable rod in the self-weight condition accounts for about 5.0% of the allowable value of the material strength, and the stress of the rod reaches 26.7% of the allowable value of the material under the self-weight and temperature coupling conditions. For example, the structure of steel truss with different structure length is analyzed, and the influence of the abutment concrete abutment should be considered in the reasonable determination of the location of the temperature seam of space steel truss structure.