上海市中环线声屏障立柱稳定性的关键参数研究及判别准则

Study on Key Parameters and Discrimination Criteria for Stability of Sound Barrier Columns along Middle Ring Line in Shanghai

摘要:

针对城市高架道路声屏障立柱的稳定性问题，以上海中环线直立式声屏障为研究对象，建立SAP2000有限元模型，通过模态分析和参数分析，量化了立柱数量、支座刚度等因素与结构基频、顶端相对位移和动力特性之间的关联性。研究结果表明：支座刚度是影响声屏障稳定性的关键参数，当支座刚度降低50%时，立柱基频下降至3.62 Hz，顶端位移增大至临界值的1.5倍。此外，通过大量参数分析，发现了相邻立柱的耦合效应，结合现场实测数据分析提出了以基频4.92 Hz和顶端位移307~436 μm为阈值的稳定性分级标准并编制了相应的指南，为声屏障的量化检测和日常预防性维护提供了理论依据和实操方法。

Abstract:

Aiming at the stability issue of the sound barrier columns on urban elevated roads, taking the vertical sound barrier on the Middle Ring Line of Shanghai as the research object, a SAP2000 finite element model is established. Through the modal analysis and parameter analysis, the correlations between factors such as the number of columns and the stiffness of supports and the fundamental frequency of the structure, the relative displacement at the top and the dynamic characteristics are quantified. The research results show that the support stiffness is the key parameter affecting the stability of the sound barrier. When the support stiffness is reduced by 50%, the fundamental frequency of the column drops to 3.62 Hz, and the top displacement increases to 1.5 times the critical value. Additionally, through a large number of parametric analyses, the coupling effect of adjacent columns is discovered. Combined with the analysis on the field measured data, a stability classification standard with a fundamental frequency of 4.92 Hz and a top displacement of 307 ~ 436 μm as the threshold is proposed and the corresponding guidelines are compiled, which provides a theoretical basis and practical method for the quantitative detection and daily preventive maintenance of sound barriers.