随着力学研究的深入和计算机技术的发展，计算机仿真已经逐渐成为结构分析和设计的重要工具。特别是当结构遇到爆炸、贯穿、冲击、倒塌等特殊荷载工况时，试验研究的难度非常大，而计算机仿真技术的安全、高效、节约等优点也得到了更加充分的体现。该文通过对爆炸荷载下的抗爆门安全性分析；纽约世界贸易中心倒塌原因分析这两个实际工程例子来说明计算机仿真技术在这些特殊工况下应用的优点及一些需要注意的问题。

FRP（纤维增强复合材料）布与混凝土界面的粘结性能是粘贴FRP布加固混凝土结构中的关键问题。首先讨论了该界面问题有限元分析的难点及建模方法，根据使用现有有限元程序试算的结果，讨论了界面问题中混凝土力学行为的特点及对混凝土本构模型的要求；在此基础上，提出了适用于分析FRP布-混凝土界面问题的混凝土本构模型，并编制了相应的程序，对FRP 布-混凝土面内剪切问题进行了分析。分析结果与试验结果吻合较好，并给出了混凝土本构模型中相应参数的建议取值。基于数值模拟结果，对FRP布-混凝土界面粘接力学机理进行了讨论。

从传统的混凝土分离裂缝模型和弥散裂缝模型出发，使用不同的模型模拟不同发展阶段的混凝土裂缝，并利用无网格方法可以灵活布置节点和边界的优点，使分离裂缝模型的使用得到很大的简化。通过在宏观裂缝表面布置基于试验结果的混凝土与混凝土界面单元，正确地模拟了裂缝表面抗剪能力的变化。算例表明，使用本文方法可以准确模拟斜拉破坏混凝土梁的破坏过程，且精度和数值稳定性要高于传统的有限元弥散裂缝方法。

With the development of mechanics and computer technology, computer simulation has become an important tool in the structure analysis and design. Especially when the structures are under disaster load such as blast, penetration, impact of collapse or typhoon, it is difficult to analyze with test method, while the advantages of computer simulation method such as safe, efficient and cheap, are shown obviously in these problems. Various simulation systems are classified and discussed in this paper generally. And four practical examples are presented to demonstrate the function of simulation system. The first one is the analysis for the safety of blast-resist-doors under blast load. The second one is the study on new earth-penetration-weapons. The third one is the simulation on the collapse ofWorld Trade Center (WTC) in New York. And the forth one is the real-time display system for bridge under typhoon. These examples are used to illuminate the advantage of computer simulation technology on disaster load conditions and emphasis some problems in the simulation.

The behaviour of reinforced concrete (RC) structures strengthened with externally bonded fibre-reinforced polymer (FRP) reinforcement in the forms of thin plates or sheets is often dominated by debonding of the FRP reinforcement from concrete. As a result, a large number of studies have addressed debonding failures in FRP-strengthened RC structures, with many of them being focussed on understanding the behaviour of simple FRP-to-concrete bonded joints in which an FRP plate/sheet is bonded to a concrete prism and is subject to a tensile force. Despite the many existing studies, there are still substantial uncertainties and difficulties with the finite element modelling of debonding failures due to the complex behaviour of cracked concrete. This paper explores the use of different crack models in modelling and compares their predictions of the debonding behaviour of FRP-to-concrete bonded joints. The results presented in this study show that a non-coaxial rotating angle crack model (RACM) is required to accurately predict this debonding behaviour. Furthermore, the debonding mechanism is also examined using results obtained with a nonco-axial RACM.