A proven beam-track contact model was used to analyze the track-structure interaction of CWR (continuously welded track) on bridge. Considering the impact of adjacent bridges, the tower-cable-track-beam-pier-pile fini...A proven beam-track contact model was used to analyze the track-structure interaction of CWR (continuously welded track) on bridge. Considering the impact of adjacent bridges, the tower-cable-track-beam-pier-pile finite element model of the cable-stayed bridge was established. Taking a bridge group including 40-32m simply-supported beam and (32+80+112)m single-tower cable-stayed bridge and 17-32m simply-supported beam on the Kunming-Shanghai high-speed railway as an example, the characteristics of CWR longitudinal force on the cable-stayed bridge were studied. It is shown that adjacent bridges must be considered in the calculation of the track expansion force and bending force on cable-stayed bridge. When the span amount of adjacent bridges is too numerous, it can be simplified as six spans; the fixed bearing of adjacent simply-supported beams should be placed on the side near the cable-stayed bridge; the track expansion device should be set at the bridge tower to reduce the track force near the bridge abutment.展开更多
This article presents in detail the assembling and welding process technique of the steel box girder tuyere blocks of Taizhou Bridge. The application of this process technique effectively solves the problem of welding...This article presents in detail the assembling and welding process technique of the steel box girder tuyere blocks of Taizhou Bridge. The application of this process technique effectively solves the problem of welding stress release in tuyere block assembling and welding without increasing the number of turns of the blocks and overhead welding, thus avoiding possible structural deformation due to excessive accumulation of internal welding stress, greatly reducing the repeated deformation and correction work during assembling and welding, and ensuring the weld seam quality and overall dimensions of tuvere blocks of Taizhou Bridze.展开更多
利用原子力显微镜研究三聚氰胺甲醛微胶囊在模型织物表面的吸附力,其中壳聚糖被用来改性以纤维素膜为模型织物的表面.实验结果表明:利用壳聚糖溶液改性纤维素膜,单个微胶囊与纤维素膜间的吸附力从2.3±1.0 n N增加到57.7±31.1 ...利用原子力显微镜研究三聚氰胺甲醛微胶囊在模型织物表面的吸附力,其中壳聚糖被用来改性以纤维素膜为模型织物的表面.实验结果表明:利用壳聚糖溶液改性纤维素膜,单个微胶囊与纤维素膜间的吸附力从2.3±1.0 n N增加到57.7±31.1 n N(接触时间为0.01 s).因此,利用壳聚糖改性纤维素膜能够增加三聚氰胺甲醛微胶囊在织物表面的吸附力.同时,通过进一步分析原子力显微镜测试得到的"力-位移图"发现:纤维素分子链伸展产生的桥接力是影响微胶囊和未改性纤维素膜之间作用力的主要原因;而静电力是影响微胶囊与壳聚糖改性纤维素膜之间作用力的主要原因.展开更多
基金Project(51178469) supported by the National Natural Science Foundation of China
文摘A proven beam-track contact model was used to analyze the track-structure interaction of CWR (continuously welded track) on bridge. Considering the impact of adjacent bridges, the tower-cable-track-beam-pier-pile finite element model of the cable-stayed bridge was established. Taking a bridge group including 40-32m simply-supported beam and (32+80+112)m single-tower cable-stayed bridge and 17-32m simply-supported beam on the Kunming-Shanghai high-speed railway as an example, the characteristics of CWR longitudinal force on the cable-stayed bridge were studied. It is shown that adjacent bridges must be considered in the calculation of the track expansion force and bending force on cable-stayed bridge. When the span amount of adjacent bridges is too numerous, it can be simplified as six spans; the fixed bearing of adjacent simply-supported beams should be placed on the side near the cable-stayed bridge; the track expansion device should be set at the bridge tower to reduce the track force near the bridge abutment.
文摘This article presents in detail the assembling and welding process technique of the steel box girder tuyere blocks of Taizhou Bridge. The application of this process technique effectively solves the problem of welding stress release in tuyere block assembling and welding without increasing the number of turns of the blocks and overhead welding, thus avoiding possible structural deformation due to excessive accumulation of internal welding stress, greatly reducing the repeated deformation and correction work during assembling and welding, and ensuring the weld seam quality and overall dimensions of tuvere blocks of Taizhou Bridze.
文摘利用原子力显微镜研究三聚氰胺甲醛微胶囊在模型织物表面的吸附力,其中壳聚糖被用来改性以纤维素膜为模型织物的表面.实验结果表明:利用壳聚糖溶液改性纤维素膜,单个微胶囊与纤维素膜间的吸附力从2.3±1.0 n N增加到57.7±31.1 n N(接触时间为0.01 s).因此,利用壳聚糖改性纤维素膜能够增加三聚氰胺甲醛微胶囊在织物表面的吸附力.同时,通过进一步分析原子力显微镜测试得到的"力-位移图"发现:纤维素分子链伸展产生的桥接力是影响微胶囊和未改性纤维素膜之间作用力的主要原因;而静电力是影响微胶囊与壳聚糖改性纤维素膜之间作用力的主要原因.
