考虑横隔板局部刚域的宽幅钢-混组合梁桥荷载试验研究

Experimental Study on the Load of a Wide-width Steel-composite Beam Bridge Considering the Local Rigid Region of a Transverse Partition

在主梁高度既定的情况下,长宽比大的桥梁横向抗弯刚度相对较大,桥面荷载横向分布对主梁应变及挠度在横桥向的响应程度影响较小;但对于长宽比小的宽幅桥梁,桥梁整体的横向抗弯刚度对应变及挠度的分布影响会急剧增大,对于分离式主梁桥梁,传统的梁格法荷载试验模型在模拟横向抗弯刚度时会产生误差,影响最终的检验结果评判精度。本文以宽幅钢-混组合梁桥荷载试验为例,采用梁格法模型计算了横隔板与主梁交接处局部刚域对理论应变和挠度横向分布的影响,结合板单元+实体单元模型和现场实测数据进行对比分析,研究结果可为宽幅分离式主梁桥梁的荷载试验及有限元模型修正提供参考。

Under the condition that the height of the main beam is given,the lateral stiffness of the bridge with large aspect ratio is relatively large,and the lateral load distribution of the bridge floor has little influence on the response degree of the strain and deflection of the main beam in the cross bridge direction.However,for a wide bridge with a small aspect ratio,the influence of the overall transverse stiffness of the bridge on the distribution of strain and deflection will increase sharply.For a separated main beam bridge,the traditional beam lattice load test model will produce errors when simulating the transverse stiffness,which ultimately affects the evaluation accuracy of the test results.In this paper,the influence of the local rigid region at the junction of the transverse diaphragm and the main beam on the lateral distribution of theoretical strain and deflection is calculated by using the beam lattice model,and the comparative analysis is made by combining the plate element+solid element model and the field measured data.The research results can provide references for the load test and finite element model revision of the wide-width separated main beam bridge.