大跨径钢桁架拱桥健康监测系统传感器优化布置研究

以九江长江大桥主跨钢桁架拱桥为工程背景,以其有限元模型分析结果为基础,基于扩展有效独立法理论进行传感器优化布置,最终形成该桥的健康监测系统传感器测点布置。     

水泥粉煤灰稳定钢渣路面基层材料研究

旨在合理利用钢渣和粉煤灰工业废渣,首先进行原材料基本性能试验分析,通过优选钢渣级配,添加碎石与钢渣按不同比例组合,进行击实、无侧限抗压强度、间接抗拉强度、室内回弹模量、稳定性试验和抗冲刷试验等各项基本力学性能指标试验,然后从路面基层材料的要求对其规律进行总结分析,为钢渣和粉煤灰工业废渣合理有效地应用到路面基层或底基层中提高科学依据。     

武汉市杨泗港快速通道转体斜拉桥设计

武汉市杨泗港快速通道转体斜拉桥为我国首座半漂浮体系独柱塔转体斜拉桥,孔跨布置为(40+88+252+88+40) m。主桥按双向八车道设计并考虑两侧设置人行道,转体质量约1. 75万t,转体半径124 m。主梁为整幅钢箱梁,采用中央双索面,桥塔为独柱形钢筋混凝土结构,斜拉索采用高强度平行钢丝。对主桥地理位置、桥型方案选择、结构设计构造及计算分析进行详细阐述,使用有限元软件对主桥进行整体静力计算、转体结构计算、抗震分析及稳定分析。计算结果表明:本桥各构件受力良好,结构安全可靠,桥梁具有良好的静动力性能。独柱宽幅中央索面转体钢箱梁斜拉桥具有良好的经济性和美观性,可为上跨铁路桥梁桥式方案提供借鉴并可进一步推广。     

客运专线铁路接触网悬挂施工技术与质量控制

研究目的:接触悬挂直接与速度相关,为了适应客运专线铁路接触网建设的需要,本文就前期研究成果以及广深线、秦沈线的施工经验,并结合国外情况,对客运专线铁路接触网接触悬挂施工技术进行系统研究。研究结果:提出了客运专线铁路接触网施工方法及质量控制措施,其中已有部分施工方法及质量控制措施纳入相关标准。     

30m装配式预应力混凝土连续T梁施工

介绍了30m装配式预应力混凝土连续T梁的预制、安装以及体系转换。     

上海铁路南站站房屋面钢结构工程制作技术研究

文章从上海铁路南站站房屋面钢结构工程的结构体系特点入手,详细介绍了结构的制作过程和构件分段的预拼装过程,研究了节点优化和焊接变形控制方法,为以后的大跨度结构工程提供了宝贵经验。     

船用柴油机气门推杆结合部杆身与钢球焊接质量检测方法的改进

本文分析了拉力法检测船用柴油机气门推杆的杆身与钢球之间的焊接质量,提出了压力检测的原理和方法,保证了焊接质量检测的合理性。     

锚链多体系统最优化求解方法及其对比分析

为了在不添加额外方程或判断条件的情况下，求解锚链多体系统悬链和卧链共存的状态，提出利用最优化原理描述静态锚链多体系统的状态方程，即最小势能方程，并与传统的悬链线方程和多体系统一般力学方程进行对比分析。结果表明，该方法不需要进行复杂的受力分析，形式简单且物理意义明确。数值计算结果与传统方法在计算悬链时是一致的，且可在统一的框架下计算悬链和卧链同时存在的状态。     

Optimal base motion to compensate for the influence of sea currents during riser re-entry

One of the difficult operations, which consists in moving the riser and placing its end relatively close to a desired position, is the re-entry operation. Complex dynamic behavior of risers under different sea conditions requires efficient modelling methods. The model used in this paper applies a modification of the segment method using joint coordinates, in which it is possible to analyze only one selected deformation while neglecting the others. This enables a very high computational efficiency of the method to be achieved. The models developed take into account the impact of the environment in which the risers work. The model is validated by comparison of the authors' own results with those presented by other researchers and the simulations are concerned both with statics and dynamics of spatial risers. The numerical effectiveness of the method presented enables it to be applied in the solution of dynamic optimization problems, one of which is presented by the example of the re-entry process. The process of moving the riser is useful in emergency situations (evacuation) when it is necessary to disconnect the riser from the wellhead and move it together with the platform. This optimization task is a 3D problem due to the sea currents acting at different angles on the riser in relation to the direction defined by beginning and final positions of the bottom end of the riser. The calculations are carried out for a hang-off riser, and the optimal motion of the base for different conditions of the sea is defined. The influence of the LMRP (Lower Marine Riser Package) on this movement is also examined.