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为保证数值分析的准确,以铺装层与钢板间的最大纵向剪应力和铺装层表面的横向最大拉应变为指标,对数值模型的横向尺寸、纵向尺寸、横隔板底约束以及单元大小等参数进行分析,得到优化模型。同时,以上海市桃浦路蕴藻浜桥工程为实桥研究对象,利用光纤光栅传感器对实桥铺装层的表面横向应变、纵向应变以及铺装层间横向应变、纵向应变进行静载测试,并与计算值对照验证。研究结果表明:模型的横向尺寸取7个U肋的距离为最优尺寸;纵向取3跨时已可以保证计算精度,简支约束更能符合桥面整体约束状态;横隔板底部的约束应采用全固定约束。采用优化模型分析得到的计算值与实桥加载得出的实测值变化趋势基本一致,仅个别工况点位存在差异。
In order to ensure the accuracy of numerical analysis, the transverse dimension, longitudinal dimension, cross-bed bottom constraint and unit size of the numerical model are taken as indices by taking the maximum longitudinal shear stress between pavement and steel plate and the transverse maximum tensile strain of pavement surface as indexes. Other parameters were analyzed to get the optimal model. At the same time, the research of Yunzaohamaqiao Bridge in Taopu Road, Shanghai was carried out by using the fiber grating sensor to test the lateral strain and longitudinal strain of the bridge surface and the transverse strain and longitudinal strain of the pavement. And verify with the calculated value. The results show that the distance between the model and the seven U-ribs is the optimal size, and the calculation accuracy can be guaranteed when the span is taken three times vertically. The constraint of the simple support more conforms to the overall constraint condition of the deck. The constraint of the bottom of the diaphragm With all fixed constraints. The calculated values obtained by the optimization model are basically the same as the measured values obtained by the real bridge loading, and there are differences only in the individual working conditions.