某人行天桥钢箱梁结构性能检测与分析

为确保惠工路钢箱梁人行天桥的安全运营，对其进行检测及安全性分析，以判定该桥的实际工作状态。利用MIDAS-CIVIL软件对天桥进行建模分析，设计静载试验加载方案，包括测点布置和荷载工况，静载试验实测最大挠度值为10.73 mm，小于规范限值(L/600)。此外还对天桥进行了动载试验，实测一阶竖向自振频率为3.601 Hz，符合设计规范要求竖向自振频率不得小于3 Hz的相关规定。试验桥跨结构的承载能力满足设计荷载(人群荷载:4.2 kN/m2)作用下的正常使用要求。

Test and Analysis of the Structural Performance of a Steel Box Girder of a Pedestrian Bridge

With the purpose of ensuring operational safety of the footbridge, some work of inspection, identification and evaluation was taken on to appraise the actual working conditions of the footbridge. Modeling and analysis of the footbridge were carried out with MIDAS-CIVIL bridge software, and the test scheme was designed, where the loading test included measure point disposal and loading scenarios.The maximum deflection of static load test was 10.73 mm, which is less than the standard limit (L/600). What's more a dynamic loading test was implemented. The measured vertical natural vibration frequency was 3.601 Hz, which meets the design requirements.The bearing capacity test of bridge structure meets the design load (crowd load: 4.2 kN/m2) requirements under normal use.