TB/T 2898-2018 in English

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Standard No:	TB/T 2898-2018
Document status:	VALID
Title in English:	Simply supported beam test methods of railway. Bridge site vertical deflection test method
Title in Chinese:	铁路简支梁试验方法桥位竖向挠度试验方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2018-01-11
Implemented on:	2018-07-01
Superseding:	TB/T 2898-1998 Assessment and Measurement Method for Vertical Deflection of Railway Bridge
Professional Classification:	TB-Railway Transport
Related Keywords:	beam bridges test method displacement meter method vertical deflection test method introduction core changes inclinometer method dynamic load test needs inclinometer method load specification loading requirements
Related Topics:	simply supported beam Charpy beam astm Charpy Beam Test deflection Charpy Beam Test astm simply supported beam Charpy beam standard railway laboratory Charpy Beam Test Method Charpy Beam Test beam test Charpy Beam Test Vertical version railway test TB/T 3474.2-2018 Steering axle test Test deflection Railway bridge acceptance microbeam test tb/t3539-2018

Introduction

Core changes in the standard revision

Comparison dimensions	1998 version	2018 version
Scope of application	Ordinary railway bridges	Newly added high-speed railway simply supported beam bridges
Test method	Displacement meter method only	Added photoelectric imaging method and inclinometer method
Load specification	Loading requirements are not specified	Detailed static/dynamic load test load standards

The standard divides vertical deflection into three categories:

Static deflection: measured when the train is stationary, reflecting the static response of the bridge
Quasi-static deflection (≤5km/h): used to separate dynamic effects
Dynamic deflection (＞5km/h): a key indicator for evaluating dynamic performance

Take a standard span beam of 32m as an example:

The static load test needs to use a wheel load measuring instrument to verify the load, and the deviation must be <1cm
The dynamic load test needs to be repeated 3 times at the same speed level, with a speed tolerance of ±3km/h
Synchronous loading is recommended for double-track bridges to simulate actual operating conditions

Parameters	Technical Requirements
Instrument Selection	Resolution ≤ 0.01mm, frequency response ≥ 15Hz
Environmental Control	Testing needs to be terminated when wind speed affects wire stability
Data Correction	The average displacement of the support needs to be deducted (Appendix A)

Fitting the deflection curve through more than 5 cross-sectional rotation angle values is particularly suitable for:

Measurement point optimization: Refer to Appendix A for differentiated arrangements for different beam types (box beam/T beam/combined beam)
Data filtering: For beams with a span of ≥24m, it is recommended to use a 0.5Hz low-pass filter to extract the center trajectory
Quality control: System calibration must be completed before dynamic load testing, and the sampling time must cover the complete dynamic response

More samples: JGJ 94-2008 QC/T 942-2021 JJG 21-2008

Sample only — not a preview of TB/T 2898-2018

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