基于参数优化的刚构桥梁的抗裂性能研究

刚构桥梁的抗裂性能是桥梁设计人员非常关注的问题.如何通过设计参数的调整来提高桥梁的抗裂性能需要予以研究.由于刚构桥梁的设计参数较多且存在耦合,研究难度较大.采用正交试验方法,考虑主梁设计参数的变化,计算和分析了桥梁的抗裂性能.研究结果认为加大主梁根部的梁高对提高桥梁的抗裂性能最为显著.     

Hydrodynamic characteristics of double permeable breakwater under regular waves

The wave transmission, reflection, and energy dissipation of the double vertical wall with permeable lower part (horizontal slots) were experimentally and theoretically studied under normal regular waves. The effect of different wave and structural parameters on the hydrodynamic characteristics was investigated e.g. the wave length, the upper part drafts, the lower part porosities, and the space between the double walls. Also, the theoretical model based on an EigenFunction Expansion Method was developed to study the hydrodynamic breakwater performance. In order to examine the validity of the theoretical model, the theoretical results were compared with the present experimental results. Comparison between experiments and predictions showed that theoretical model provides a good estimate to the wave transmission, reflection, and energy dissipation coefficients when the friction factor f = 3. The hydrodynamic efficiency of the proposed breakwater is strongly affected by changing the following: (1) The two upper part drafts together, (2) The upper part draft of the first barrier, (3) The two lower part porosities together, (4) The lower part porosity of the first barrier.     

信息化条件下炮兵火力最优分配问题研究

文章从信息化条件下对炮兵作战的精确性要求出发,针对当前炮兵火力分配面临的困难,分析了对炮兵火力分配影响的因素,建立了炮兵火力最优分配模型。     

船舶成品管尺寸偏差自动测量系统

针对使用传统量具对船舶成品管尺寸偏差进行检验存在效率低、误差大等问题，设计一种基于多相机摄影测量系统的船舶成品管尺寸偏差自动测量系统。该系统由近景工业摄影测量双相机系统、扫码枪软件集成系统、实时数字化分析软件和编码定位工装组成，实现不同种类成品管的实时在线检测工作，并出具检测结果报告。该系统可提高船舶成品管的检测精度和检测效率。     

复杂艰险山区高速铁路桥梁设计技术

本文针对复杂艰险山区高速铁路桥梁设计中的主要技术问题,结合相关科学研究和实践经验,提出了高速铁路高墩大跨桥梁跨径范围和选型原则,提出了高烈度地震区桥梁设计和减隔震技术,提出了峡谷风环境下高速铁路行车安全保障技术。同时,对复杂艰险山区高速铁路桥梁设计中常见的高陡边坡防护、危岩落石防护以及泥石流综合治理等关键技术进行了总结,提出了相应的设计原则和解决方法,为复杂艰险山区高速铁路桥梁设计提供了重要的技术支撑。