【正文】 s requirements for fresh air in the carriage . . began the research and use of the guardrail from 1920, on the basis of theory analysis and simulation experiment, protect and block and collide to verify the application practice on the experiment and highway through the full size of real car, have accumulated a large number of materials and abundant experience. The national traffic research institute of research association of . made the evaluation criterion of the expressway safety devices in 1981, organized guardrail structure of the expressway and a series of research work of different safety devices and wrote various kinds of design specifications around 1970 and 1986. Such countries as France , Britain , Germany ,etc. were beginning the research work of the structure of the guardrail long ago too, set up and amplify a whole set of experiment facilities and corresponding experiment rules, have studied the guardrail structure of many kinds from theory and experiment . The research work of the ones that began in this respect in the fifties in Japan, and began to use the guardrail regularly in the supernatural expressway of the name. In short more than ten years, numerous research i。s own structure rigidity is great, not only the ability to absorb energy is low, but also apt to cause two accidents. The semirigid guardrail is a kind of continuous roof beam post type guardrail structure, because there are certain rigidity and flexibility, have certain energy absorbability , but lighten the injury to the passenger and vehicle greatly , so already widely applied to the highway engineering. The roof beam guardrail of the wave form is a main form of the semirigid guardrail , carry on research of performance and energy absorbability of safe protection to it, will play a instructing role to the construction of the expressway of mountain area , will offer the theoretical foundation for some designs of posite guardrail . Improve the environmental quality of the underground space and ventilation result, offer the fortable environment of going by bus to passenger, offer the good condition of work to station equipment and staff member , make the underground environment get effective control. Satisfied when the fire accident happens in the station or the annex, arrange cigarettes and ventilate effectively, guarantee passenger39。s security , moulding industry39。s unit simulation. Use automobile semirigid guardrail collide system intact coupling dynamics model, carry on sensitivity , structure of design parameter analyse , study semirigid guardrail structure form to collide automobile actual sport influence law of law in the course at first, automobile law and its the most unanimous optimum structure form of ideal sport law of real sport by fixing making . Then to optimum structure form, is it use automobile semirigid guardrail collide system intact coupling dynamics model to continue, study the law of impact on real sport law of the automobile of design parameter of the structure, in order to confirm the optimum design parameter. The experimental number of times that reducible to collide , obtained the considerable direct economic benefits. For a long time , to semirigid design of guardrail , adopt experience design method , half analyze technology and test method is it go on to mix all, though can design the feasible guardrail , costly and timeconsuming only according to testing and trying playing, very unremunerative, and difficult to make the security level of the semirigid guardrail in optimum state. If there is semirigid guardrail that designs the new technology and does guidance, can dispel the potential safety hazard during the course of designing , reduce and collide the experimental number of times, reduce once the test of colliding , can economize 100,000200,000 yuan . In addition, can optimize the structure of guardrail in the forming and design parameter, has solved the problem that the traditional method is difficult to solve . The new mechanism of the anticollision of semirigid guardrail is used in the design and improvement of the semirigid guardrail on the expressway and specialpurpose Class I Highway of automobile mainly, certainly, can apply to the design and improvement of the semirigid guardrail on other highways at all levels too. However, impact kiic energy and its travel speed that the automobile has are the square of in direct radio, once the highspeed automobile that goes crosses the traffic accident outside the outlet (the proportion of taking the total amount of traffic accidents of this kind of accident is about 45%, about 30% on the expressway on the ordinary arterial highway), the consequence will be more serious . At this moment , design the furnishing that the unreasonable guardrail will bee the danger , and then influence the effective use of the expressway and superhighway seriously, can39。s own geometry form and size, consider such plicated factors as the contact and friction between the automobile and guardrail ,etc., it is more suitable to adopt the finite element model. For is it calculate precision and putational efficiency two demand of respect to give consideration to, to is it is it is it adopt explicit integration form to plan to solve to ask model, all units adopt some total mark and leading parameter sand and leak the control technology , in order to improve the putational speed. In order to make the big system model set up can be used in the research of various kinds of structure forms of semirigid guardrail and design parameters and law giving consideration to the model more conveniently, plan to set up an automobile in mon use and simplify models, and set up the guardrail model storehouse made up of several model and characteristic of semirigid guardrail according to the need.