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预应力混凝土连续宽箱梁桥广泛应用于当前桥梁建设中,但因其宽跨比较大,在偏载作用下,需要合理确定偏载增大系数。该文结合某两跨连续宽箱梁桥,分别建立了空间梁单元模型和实体单元模型,梁单元模型采用经验系数法考虑偏载效应,对偏载作用下的受力进行了分析,将理论计算结果与静载试验值进行了对比分析。结果表明:实体有限元模型的计算结果与实测值接近,各测试截面的偏载增大系数相差在7%以内,梁单元模型计算的跨中最大位移比实测值偏小10%,中支点处最大压应变偏小18.6%,故对宽箱梁桥设计宜采用实体模型计算偏载增大系数或进行受力分析。
Prestressed concrete continuous wide box girder bridge is widely used in the current bridge construction, but due to its wide span ratio, partial load, the need to determine the partial load to increase the coefficient. In this paper, a two-span continuous wide-box girder bridge was established, respectively, the spatial beam element model and solid element model, beam element model using empirical coefficient method to consider the partial load effect, partial load under the force was analyzed, the theory The calculated results and static load test values were compared. The results show that the calculation results of the solid finite element model are close to the measured values, the partial load increasing coefficients of each cross section are within 7%, the maximum displacement of the midspan calculated by the beam element model is 10% less than the measured value, The maximum compressive strain is 18.6% smaller than that of the case. For the design of wide box girder bridges, solid model should be used to calculate the partial load increasing coefficient or stress analysis.