基于遗传算法的锚固结构外露段动力特性研究

Research on Exposed Anchorage Structure Dynamical Characteristic Based on Genetic Algorithm

锚固结构因其可靠性、经济性广泛应用于大型建设工程中,然而受多种因素影响锚固结构存在许多损伤,需要对其质量进行检测.本文将竖向预应力钢筋简化为单自由度振动模型,在实验室建立相应的试验简支梁模型,对钢筋逐级加载.在螺母水平方向施加瞬态激励,采集系统的输入输出波形.用遗传算法辨别系统参数,编写相应的程序,使用matlab工具箱计算不同张拉力下的刚度.结果表明:虽然在高吨位时刚度出现负增长,但总体而言刚度与张拉力呈线性递增.因此本文为无损检测技术在锚固质量方面的应用提供了理论依据与参考价值.

Anchorage structure is widely used in large construction projects because of its reliability and economy. However, anchorage structure has a lot of damage affected by various factors. It is necessary to detect the quality. In this paper, the vertical prestressed reinforcement is simplified into a single degree of freedom vibration model. The test beam model is extabished in the laboratory with gradual loading rein- forcements. Transient excitation nut is used in horizontal direction, and the input and output waveform of the systerm is collected. The system parameters are identified by using genetic algorithm, corresponding procedures are given and the stiffness under different tension is calculated by using the Matlab toolbox. The results show that the stiffness has negative growth in the high tonnage, but the stiffness and tensile force are a linear increasing overall. This paper provides theoretical basis and reference value for applica- tion of nondestructive testing technology in anchorage quality aspects.