Nguyễn Việt Hà Vũ Ngọc Quang *

* Tác giả liên hệ (quangvn@utt.edu.vn)

Abstract

The paper analyses the monitoring performance of a cable-stayed bridge using the Global Navigation Satellite System with post-processed static and real-time kinematic methods utilising a Topcon MR2 receiver. Data is collected from a monitoring antenna on a stayed cable bridge for 9 days from 21/7/2022 to 29/7/2022, with 216 static observations, one-hour sessions. Regarding the real-time kinematic method, the study uses 86400 one-second interval observations. The analysis results indicate that the static measurement exhibits significantly more minor fluctuations than the real-time kinematic measurement method, both over one day and when averaged over one-hour intervals. In terms of trend, both methods exhibit the same overall trend. Specifically, the smallest oscillations are observed in the transverse direction of the bridge, followed by the longitudinal direction, with the largest oscillations occurring in the vertical direction.

Keywords: Bridge monitoring, Oscillation, RTK-GNSS, static GNSS

Tóm tắt

Bài báo được thực hiện nhằm nghiên cứu, phân tích hiệu suất quan trắc công trình cầu dây văng sử dụng hệ định vị vệ tinh toàn cầu với hai phương pháp đo tĩnh xử lý sau và đo động thời gian thực với máy thu Topcon MR2. Trong nghiên cứu, kết quả từ một anten quan trắc trên công trình cầu dây văng trong thời gian 9 ngày từ 21/7/2022 đến 29/7/2022 đã được sử dụng với tổng số lượng 216 trị đo, thời gian đo tĩnh của mỗi ca là một giờ đồng hồ. Với phương pháp đo động thời gian thực, 86400 trị đo, ở tần suất 1 giây đã được sử dụng trong nghiên cứu. Kết quả phân tích cho thấy phương pháp đo tĩnh có biên độ dao động nhỏ hơn nhiều lần so với phương pháp đo động thời gian thực xét trong thời gian một ngày và cả khi lấy trung bình theo thời gian một giờ đồng hồ với phương pháp đo động. Về xu hướng, cả hai đều thể hiện cùng một xu hướng khi cho kết quả dao động theo phương ngang ngang cầu là nhỏ nhất, tiếp theo là phương ngang dọc cầu và cuối cùng là phương đứng.

Từ khóa: Dao động, GNSS động, GNSS tĩnh, quan trắc cầu

Article Details

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