Critical coupling span number in high-speed railway simply supported beam bridge

IF 2.1 3区 工程技术 Q2 ENGINEERING, CIVIL
Yun-tai Zhang, Jiang Lizhong, Zhou Wangbao, Yulin Feng, Xiang Liu, Lai Zhipeng
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引用次数: 3

Abstract

In long-distance railways, some particular spans of high-speed railway simply supported beam bridges (HSRSBs) are commonly selected as the target structure. The target structure is the part of interest for the study and intended to be analyzed. Due to longitudinal constraints of the track system, the target structure is tightly coupled with other spans within certain range, and is affected by the coupled spans under longitudinal earthquake condition. A massive amount of time-consuming computation is required to determine the coupling span number using current finite element models. In an effort to overcome this challenge, an equivalent method for the longitudinal constraints of the track system is proposed, which greatly reduces the complexity of finite element model while retaining calculation precision. The coupling span number was determined by seismic analyses of a large number of cases using equivalent finite element models. Moreover, the influence of pier height and bottom pier stiffness on coupling span number was studied. Based on the relationship between the equivalent boundary sensitivity critical point and coupling span number, a method to quickly obtain coupling span number of the target structure in arbitrary HSRSB was constructed.
高速铁路简支梁桥的临界耦合跨数
在长距离铁路中,一些特定跨度的高速铁路简支梁桥(HSRSB)通常被选为目标结构。目标结构是本研究感兴趣的部分,旨在进行分析。由于轨道系统的纵向约束,目标结构在一定范围内与其他跨度紧密耦合,并在纵向地震条件下受到耦合跨度的影响。使用当前的有限元模型来确定耦合跨度数需要大量耗时的计算。为了克服这一挑战,提出了一种求解轨道系统纵向约束的等效方法,在保持计算精度的同时,大大降低了有限元模型的复杂性。耦合跨度数是通过使用等效有限元模型对大量情况进行地震分析来确定的。此外,还研究了墩高和底墩刚度对耦合跨数的影响。基于等效边界灵敏度临界点与耦合跨度数之间的关系,构造了一种在任意HSRSB中快速获得目标结构耦合跨度数的方法。
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来源期刊
Smart Structures and Systems
Smart Structures and Systems 工程技术-工程:机械
CiteScore
6.50
自引率
8.60%
发文量
0
审稿时长
9 months
期刊介绍: An International Journal of Mechatronics, Sensors, Monitoring, Control, Diagnosis, and Management airns at providing a major publication channel for researchers in the general area of smart structures and systems. Typical subjects considered by the journal include: Sensors/Actuators(Materials/devices/ informatics/networking) Structural Health Monitoring and Control Diagnosis/Prognosis Life Cycle Engineering(planning/design/ maintenance/renewal) and related areas.
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