基于振型转角改变的框架梁损伤检测研究

为了检测框架梁的损伤，提出了一种基于梁柱节点振型转角改变的框架梁损伤识别方法。首先，对框架结构梁柱节点振型平移和振型转角进行敏感性分析，得到振型平移和振型转角的敏感性系数。然后，根据损伤前后梁柱节点的振型转角变化初步判别损伤梁的位置。接着，以敏感性分析结果为基础，通过迭代计算获得修正后梁柱节点振型转角改变值。最后，根据修正振型转角改变值识别结构损伤位置和损伤程度。一五层三跨框架的数值算例验证了该方法的有效性。
Abstract：In order to detect damages of frame beams, a method based on changes in mode rotary angles of beam-column nodes was proposed.Firstly, sensitivity analysis was conducted for mode displacements and rotary angles of frame beams and their sensitivity coefficients were derived.Then, locations of damaged beams were primarily determined according to changes in mode rotary angles of beam-column nodes before and after damage.Furthermore, based on the results of sensitivity analysis, change values in mode rotary angles of beam-column nodes were modified using the iterative algorithm.Finally, locations and levels of damage were identified based on the modified changes in mode rotary angles of beam-column nodes.The validity of the proposed method was verified using a numerical example of a 5-story 3-span frame.