侧面柱碰撞的研究

交通事故表明，车辆与柱状物发生侧面碰撞而导致乘员重度伤害的比例较高，因而对侧面柱碰撞的研究是必要的。基于力学理论对这种特殊的侧面碰撞形态进行分析，同时以乘员伤害和车身变形作为指标。对三种不同形式国产轿车的试验结果进行比较。可找出侧面柱碰撞与一般侧面碰撞间的差别，进而为车身侧面结构的改进提供参考依据。     

扇形布置法变宽组合箱梁桥纵向受力分析

对互通内常见的变宽桥梁在变宽幅度不大的情况下提出了采用装配式预制结构的设计思路,并从理论角度对变宽桥与等宽桥的受力特性进行对比,结合多种程序计算结果,提出一般性的设计原则和简化思路．可供互通主线长大桥中的局部变宽设计参考。     

梁构件之振动式快速损伤诊断技术

如何能够快速而又准确地进行桥梁损伤诊断,是目前桥梁养护管理单位所关心的问题,文章提出一种梁构件振动式快速损伤诊断技术,此方法以量测结构振动信号配合破坏力学及旋转弹簧的概念,进行损伤位置与劣化程度诊断之计算。并用SAP2000的数值模拟以及实际的铝梁敲击实验进行此损伤诊断方法的验证,实验中的自然频率是藉由频率域分解法（FDD）来计算,由互易定理量测到的力与加速度信号所得到的。最后更进一步地探讨以理论的模态振型及实际量测到的模态振型所计算的损伤位置与劣化程度的结果,以及损伤产生前后可能面临到的系统边界条件改变之问题。     

钢筋砼空心截面抗滑桩的研究

笔者针对单根的抗滑桩,对空心截面和实心截面抗滑桩进行了力学性能的对比分析,对空心截面抗滑桩的钢筋用量进行了经济评价.并通过对桩-边坡的有限元模拟分析,得出空心截面抗滑桩不仅能满足抗滑结构要求,而且节省材料是一种较为经济的截面形式,为今后空心截面抗滑桩的设计提供一种新的思路.     

钢箱梁桥面柔性铺装荷载响应力学分析

根据线弹性理论和层状体系理论,用有限元分析方法对钢箱梁桥面铺装层的弯沉量、层顶弯拉应力、粘结层与桥面板结合处的主剪切应力的分布与变化进行了计算与分析,确定了最大弯沉量、最大弯拉应力和最大层间剪切应力的产生位置及其量值。研究结果可以为大跨径钢箱梁桥面柔性铺装设计提供理论参考。     

History of wheel/rail contact mechanics: from Redtenbacher to Kalker

The history of wheel/rail contact mechanics is an integrated part of contact mechanics. Problems of wheel/rail contact (damage phenomena and influence of contact mechanics on vehicle dynamics, especially on vehicle stability) have been investigated since the middle of the 19th Century. In 1855, Redtenbacher was the first to consider head checking. Stability investigations started with Boedecker (1887) and were continued by Carter (1916); however, they were not recognized at that time. Stability analysis was only considered to be an integrated step in vehicle design in about 1955 when stability problems started to occur in practice. The scientific foundations of our present investigations are based on Heinrich Hertz, Frederick William Carter and Hans Fromm. The key contributors to research in the last fifty years in the field of wheel/rail contact mechanics are Joost Kalker and Ken Johnson.     

基于散体力学理论的多级抗剪密级配设计方法

通过对散体细观力学模型进行分析,推导出散体剪切模量的计算公式,从理论上分析了提高集料散体抗剪切性能的方法;结合逐级填充理论,提出多级抗剪密级配(Multilevel Anti-shear Grading)设计方法,以提高混合料的抗剪切流动变形能力;最后对算例进行级配分析和路用性能试验,比较MAS-16与SMA-16的优缺点,提出多级抗剪密级配设计方法的适用范围.结果表明:多级抗剪密级配的高温稳定性和水稳定性都比较好,适合于高温多雨地区.     

Inverse identification of wheel–rail contact forces based on observation of wheel disc strains: an evaluation of three numerical algorithms

In this paper, three numerical algorithms for the identification of wheel–rail contact forces based on measured wheel disc strains on an instrumented railway wheelset are discussed and compared. The three algorithms include one approach resting on static calibration, one that is applying a Kalman filter and the third is exploiting an inverse identification scheme. To demonstrate and evaluate the alternative methods, two load cases including periodic excitation by sinusoidal wheel–rail irregularities and transient excitation by an insulated rail joint are considered. Based on a previously presented vehicle–track interaction model in the time domain, load scenarios are defined by taking the calculated vertical wheel–rail contact forces as the reference force to be re-identified by the proposed algorithms. The reference contact forces are applied on a finite element model of the wheel to generate synthetic observation data, that is, radial strains at the positions of the strain gauges, serving as input to the identification procedures. It is concluded that the inverse identification scheme leads to superior accuracy at higher computational cost. If on-line implementation and evaluation is required, the Kalman filter generates better accuracy than the static calibration approach.     

溶洞的存在对隧道开挖影响的数值分析

以白须公1号隧道为背景,运用有限元程序MIDAS/GTS模拟了隧道穿过特大溶洞时分台阶开挖的施工过程,分析了隧道在有溶洞条件下的施工力学行为,为关键部位加强支护提供理论依据。分析结果表明：该溶洞围岩自承能力较好,隧道衬砌连接处会出现应力集中,施工过程中要确保支护结构的整体稳定。     

静水中水面倾覆船舶打捞的力学分析

水面倾覆船舶的打捞过程是一项非常复杂的海上打捞作业。主要研究静水中水面倾覆船舶的打捞问题。首先对其进行稳性计算，然后初步规划出打捞方案，再对打捞过程进行力学分析。采用起吊能力较大的浮置起重机作为主要打捞工具，同时装配甲板滑车来支撑和稳定船舶。对打捞过程中船舶的水动力特性及起吊力的计算，运用matlab工具实现数值仿真。最后对计算结果进行分析。