Abstract
In order to achieve the old fence of reuse, improve the safety performance of guardrail, barrier structure does not meet the requirements, make full use of the old concrete guardrail on the basis of heightening, through computer simulation experiment were analyzed, and optimization design, through the real car collision test, make the concrete guardrail after heightening structure satisfies the requirement of the safety performance of current specification. The results show that the protective performance of the two guardrail schemes meets the requirements of the current guardrail evaluation standards through the computer simulation experiment. Through the optimized design of scheme 1, the actual car crash test proves that the enhanced structure of Minhua TYPE II concrete guardrail can meet the requirements of safety performance evaluation. The research results provide an important basis for the transformation of the guardrail and the revision of the current design of expressway in China.
Highlights
IntroductionAs a passive safety facility, highway guardrails play an important role in reducing the severity of the consequences of traffic accidents and improving the level of highway traffic safety protection
In order to achieve the old fence of reuse, improve the safety performance of guardrail, barrier structure does not meet the requirements, make full use of the old concrete guardrail on the basis of heightening, through computer simulation experiment were analyzed, and optimization design, through the real car collision test, make the concrete guardrail after heightening structure satisfies the requirement of the safety performance of current specification
The results show that the protective performance of the two guardrail schemes meets the requirements of the current guardrail evaluation standards through the computer simulation experiment
Summary
As a passive safety facility, highway guardrails play an important role in reducing the severity of the consequences of traffic accidents and improving the level of highway traffic safety protection. Use concrete and W-beam guardrails to compare the performance of removable middle guardrails. D.J. and others set up a model of limited metadata of a metal beam column guardrail for vehicle collision, and through numerical simulation, analyzed the sensitivity of the maximum dynamic deformation of anti-collision guardrail to the change of vehicle mass, impact speed and impact angle. The computer simulation analysis method was used to compare and optimize the schemes, and a scheme with safe performance and good maintainability was selected to carry out a full-scale crash test on a real car, so that the modified guardrail could meet the requirements of the current code for the guardrail crashworthiness level
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