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Performance of curved steel bridge railings subjected to truck collisions

机译：弯曲的钢桥栏杆在卡车碰撞下的性能

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摘要

Curved steel railings are used along curved road sections and bridges for safety. As with other railings, they are required to meet four performance standards as: (1) to prevent vehicles from leaving the road; (2) to protect occupants; (3) to guide vehicles back to the line of the road; and (4) to prevent penetration of the railing. Current Japanese specifications for railing design concern only straight railings. Some researchers and engineers suspect that curved railings are more dangerous than straight ones and this study finds that the impact angle between truck and railing, which affects both railing and truck behavior, can be larger than the angle allowed for in the Japanese specifications in some actual cases of curved roads and bridges. The purpose of this research is therefore to verify the above suspicion and to investigate the performances of curved railings subjected to collisions at the larger impact angles. A full-scale test would be the ideal methodology for this purpose but a test of the right sort would involve a considerable cost and effort. Thus numerical analyses are relied on to study the performance of curved steel railings according to the following procedures: (1) the railing and truck are represented by finite element models; (2) various cases are simulated of truck collisions with railings; and (3) numerical results are obtained for the consequent displacements, energy responses and truck behaviors as a means of evaluating the railing performances. The railings investigated in the various simulation cases are of grade SC and are either straight or have a curve radius of 100 m, 150 m, 280 m or 460 m. The software engine used for the numerical analysis is LS-DYNA 3D. Based on the results of the study, a design recommendation is proposed for curved railings.
机译：为了安全起见，弯曲的钢栏杆沿弯曲的路段和桥梁使用。与其他栏杆一样，它们必须满足以下四个性能标准：（1）防止车辆离开道路； （二）保护乘员； （三）引导车辆驶回道路； （4）防止栏杆穿透。当前日本的栏杆设计规范仅涉及直栏杆。一些研究人员和工程师怀疑弯曲的栏杆比直的栏杆更危险，并且该研究发现，卡车和栏杆之间的碰撞角（既影响栏杆又影响卡车的行为）可能比日本规范中允许的角度大一些。弯曲的道路和桥梁。因此，本研究的目的是验证上述怀疑，并研究在较大冲击角下遭受碰撞的弯曲栏杆的性能。全面测试将是达到此目的的理想方法，但正确的测试将需要大量的成本和精力。因此，根据以下程序，依靠数值分析来研究弯曲钢栏杆的性能：（1）栏杆和卡车用有限元模型表示； （2）模拟了卡车与栏杆碰撞的各种情况； （3）获得了由此产生的位移，能量响应和卡车行为的数值结果，作为评估栏杆性能的一种手段。在各种模拟情况下研究的栏杆均为SC级，是直的或弯曲半径为100 m，150 m，280 m或460 m。用于数值分析的软件引擎是LS-DYNA 3D。根据研究结果，提出了弯曲栏杆的设计建议。

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