岸桥刚度畸变相似模型振动台地震模拟试验研究

动力学模型试验是研究岸桥地震破坏机制的重要手段之一。针对由岸桥不完全相似模型(即畸变模型)试验结果来预测原型动力学特性的问题,基于振动台性能参数及模型加工约束提出了弯曲刚度畸变模型试验,并采用预测系数法对试验数据进行修正。设计制作了3套刚度产生不同倍率畸变的1:20岸桥试验模型,分别进行了振动台地震模拟试验,测试了模型结构在不同地震作用下的动力响应。同时,采用ABAQUS软件建立岸桥原型有限元模型并进行地震时程计算,将计算值与试验数据进行对比,结果显示:经过预测系数修正后的试验数据与有限元计算结果吻合较好,刚度畸变模型是可以对岸桥原型的地震响应进行准确预测的。

Shaking table tests for stiffness distortion similarity model of a container crane

Dynamic model test is one of important means to study seismic failure mechanism of a container crane.Here,aiming at problems appearing due to using test results of a container crane’s incomplete similarity model (distorted one) to predict dynamic characteristics of the original container crane,based on the shaking table’s performance parameters and the model processing constraints,the container crane’s bending stiffness distortion model tests were proposed and the predicting coefficient method was used to modifying the test data.Three test models with different rate distortions were designed and made.Shaking table seismic analog tests were conducted for these models to measure dynamic responses of these models under different earthquakes.Meanwhile,the finite element model for the original container crane was established with the software ABAQUS to calculate its seismic response time histories.The calculation data were compared with test ones.The results showed that the test data modified with the predicting coefficient method agree well with the finite element calculation results;the stiffness distortion model can be used to accurately predict seismic responses of the original container crane.