钢-混组合梁桥不同施工方法恒载作用效应分析

Analysis of THR Effect of Constant Load on Steel-Concrete Composite Girder Bridges with Different Construction Methonds

为了解恒载组合梁施工与活载组合梁施工两种不同施工方法对混凝土桥面板和钢梁力学性能的影响,分别建立采用不同施工方法的组合梁有限元精细模型,通过对比有限元和试验结果,分析两种不同施工方法下荷载效应的变化规律。结果表明,有限元模拟结果与理论结果所得的钢梁应力值误差在5%以内,混凝土板应力值误差在10%以内。相较于活载组合梁,恒载组合梁钢梁上翼缘最大压、拉应力分别降低了36.2%和12.8%,钢梁下翼缘最大拉、压应力分别降低了5.9%和7.7%。综合考虑,采用有限元软件分析结果可以较好地反映组合梁的应力分布情况且采用恒载组合梁施工能够更好利用钢材与混凝土材料性能。

In order to understand the effects of two different construction methods,constant load and live load,on the mechanical properties of concrete deck slabs and steel girders,finite element finite element models of the girders with different construction methods were established,and the changes of load effects under the two different construction methods were analyzed by comparing the finite element and experimental results.The results show that the errors of the stress values obtained from the finite element simulation results and the theoretical results are within 5%for the steel beam and within 10%for the concrete slab.Compared with the live load combination beam,the maximum compressive and tensile stresses at the upper flange of the steel beam of the constant load combination beam are reduced by 36.2%and 12.8%,respectively,and the maximum tensile and compressive stresses at the lower flange of the steel beam are reduced by 5.9%and 7.7%,respectively.In consideration,the analysis results of finite element software can better reflect the stress distribution of the combination beam and the construction of constant load combination beam can better utilize the properties of steel and concrete materials.