论文部分内容阅读
之江大桥以246m的主跨处于拱形主塔斜拉桥主跨的第一名,其建设和运营期间的安全和健康监测、诊断以及各种灾害影响下的损伤预测,也被赋予了极大的关注。本文依据拱形钢塔动力特性的计算结果,确定了相关振型的最大幅值位置,以此来布置不同施工阶段拱形钢塔的试验测点,为动力特性的测试提供指导依据。在此基础上,通过对该桥塔进行动力特性检测,一阶自振频率与理论值较接近,二阶与三阶频率则与理论值有偏差,其原因估计由实际施工时的约束条件和质量系统等与理论计算的不一致造成。
The main span of Zhijiang Bridge at the main span of the arch-type main tower cable-stayed bridge with a span of 246m is also given priority to in terms of safety and health monitoring and diagnosis during construction and operation as well as damage prediction under various disasters. Big concern. Based on the calculation results of the dynamic characteristics of the arch steel tower, the maximum amplitude position of the relevant vibration mode is determined, and the test points of the arch steel tower in different construction stages are arranged to provide the basis for the test of dynamic characteristics. On the basis of this, the first-order natural frequency is close to the theoretical value by detecting the dynamic characteristics of the bridge tower. The second and third-order frequencies deviate from the theoretical value. The reason is estimated from the actual construction constraints and Caused by the inconsistency between the quality system and the theoretical calculation.