400 km/h高速铁路常用跨度混凝土简支梁竖向基频研究-《高速铁路技术》

文章信息/Info

Title:: Study on the Vertical Fundamental Frequency Limit Value of Common Span PC Simply-supported Beam for 400 km/h High-speed Railway

作者:: 李克冰; 班新林; 郭建勋; 谢海清; 1. 中国铁道科学研究院集团有限公司, 北京 100081;
2. 中铁二院工程集团有限责任公司, 成都 610031

Author(s):: LI Kebing; BAN Xinlin; GUO Jianxun; XIE Haiqing; 1. China Academy of Railway Sciences Co., Ltd., Beijing 100081, China;
2. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China

Keywords:: high-speed railway|simply-supported box beam|fundamental frequency|moving load train|dynamic

摘要:: 简支梁自振频率的合理取值对保证列车的运营安全及舒适性尤为重要。本文比较了车桥耦合作用与移动荷载列车作用下简支梁的动力响应；基于移动荷载列模型，计算得出不同列车作用下32 m与40 m简支梁的动力系数与梁体竖向加速度；以桥梁的实际运营活载效应小于设计活载效应为准则，提出了400 km/h高速铁路常用跨度混凝土简支梁的竖向基频建议限值。研究表明：（1）采用移动荷载列模型对于研究简支梁的竖向基频是合理可行的；（2）40 m简支梁的动力响应明显小于32 m简支梁，40 m简支梁对400 km/h高速铁路适应性更好；（3）32 m混凝土简支梁竖向基频建议限值取5.1 Hz（160/L），40 m混凝土简支梁满足规范中下限值即可。

Abstract:: Reasonable value of natural frequency of simply-supported beam is vital for operation safety and riding comfort of trains running at a high speed. In this paper, we compared the dynamic responses of simply-supported beam under the vehicle-bridge coupling and moving load trains; determined the impact factor and vertical acceleration of the simply-supported beam with 32 m and 40 m span under different moving trains, based on the moving load train model; proposed the vertical fundamental frequency limit value of PC simply-supported box beam for high-speed railway with a design velocity of 400 km/h or higher, according to the principle of the bridge dynamic response under the running train smaller than that under the design live load. According to the analysis, we found out that:(1) The moving load train model is reasonable and feasible for researching the natural frequency of simply-supported beam. (2) The dynamic response of 40 m simply-supported beam is much less than that of 32 m simply-supported beam, indicating that 40 m simply-supported beam features better adaptability for 400 km/h high-speed railway. (3) The recommended limit value of vertical fundamental frequency of 32 m PC simply-supported beam is 5.1 Hz (160/L), and that of 40 m PC simply-supported beam could take the lower limit value of the current codes.

备注/Memo:: 作者简介:李克冰(1988-),男,助理研究员。基金项目:中国铁道科学研究院集团有限公司院基金课题（2020YJ048）；中铁二院工程集团有限责任公司科技发展计划项目（KSNQ202052）引文格式:李克冰, 班新林, 郭建勋, 等. 400 km/h高速铁路常用跨度混凝土简支梁竖向基频研究[J]. 高速铁路技术,2021,12(2):102-107.LI Kebing, BAN Xinlin, GUO Jianxun, et al. Study on the Vertical Fundamental Frequency Limit Value of Common Span PC Simply-supported Beam for 400 km/h High-speed Railway[J]. High Speed Railway Technology, 2021, 12(2):102-107.