平缀管式钢管混凝土格构柱拟动力试验研究  

PSEUDO-DYNAMIC TEST OF CFST LATTICE COLUMNS WITH FLAT LACING TUBES

作　　者：袁辉辉[1,2] 吴庆雄 陈宝春[1] 蔡慧雄 YUAN Hui-hui;WU Qing-xiong;CHEN Bao-chun;CAI Hui-xiong(Department of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350116,China;Fujian Key Laboratory of Engineering Structures,Fuzhou,Fujian 350116,China;Fujian Key Laboratory of Civil Engineering Disaster Prevention,Fuzhou,Fujian 350116,China;Fujian Communications Planning & Design Institute,Fuzhou,Fujian 350004,China)

机构地区：[1]福州大学土木工程学院,福建福州350116 [2]工程结构福建省高校重点实验室,福建福州350116 [3]福建省土木工程多灾害防治重点实验室,福建福州350116 [4]福建省交通规划设计院,福建福州350004

出　　处：《工程力学》2019年第7期67-78,共12页Engineering Mechanics

基　　金：国家自然科学基金项目(51508104,51678154)

摘　　要：在平缀管式钢管混凝土格构柱拟静力试验研究的基础上,进行了2个1∶8缩尺模型的拟动力试验,分别采用2008年汶川大地震和1995年日本阪神大地震的地震动时程记录作为输入地震波,研究在不同强度地震和主余震作用下此类结构的变形、强度、刚度、耗能等抗震性能。研究结果表明:平缀管式钢管混凝土格构柱具有良好的抗震性能,在8度多遇、基本、罕遇、极罕遇地震作用下,结构处于弹性工作状态;在9度罕遇地震作用下,钢管混凝土柱肢发生屈服,结构进入弹塑性工作状态;随着地震动峰值加速度的增加,柱底钢管应变急剧增加,柱顶最大响应位移非线性增长;直至试验加载结束,柱肢底部塑性铰区域未形成屈服环,结构无明显破坏。主余震作用加剧了结构的累积损伤,结构的刚度退化现象比较明显,在经历1次9度罕遇主震和2次同等强度的余震作用后,结构弹性阶段刚度相比初始弹性刚度减小约50.0%,最大位移增大约41%。通过钢管混凝土格构柱在各地震工况下的强度与变形的验算,进一步表明此类结构具有足够的强度储备和良好的变形能力,在经历多次强震后仍能保持一定的承载能力,在我国高烈度地区的桥梁工程中具有极大的应用前景。Based on quasi-static tests,a pseudo-dynamic test of two 1/8-scaled concrete-filled steel tubular(CFST)lattice columns with flat lacing tubes was performed.The seismic records from the Wenchuan 2008 Earthquake and Kobe 1995 Earthquake were used as input ground motions.Seismic performance including deformation,strength,stiffness,and energy dissipation of the CFST lattice columns was studied with earthquakes and main aftershocks of different intensities.The results show that the CFST lattice columns with flat lacing tubes had good seismic performance.The structure was in an elastic state when subjected to the intensity 8 frequent,basic,rare,and extremely rare earthquakes.Under the intensity 9 rare earthquakes,the CFST column limbs yielded,and the structure entered the elastoplastic working state.With the increase in the peak ground acceleration,the strain of the steel tube at the bottom and the maximum response displacement at the top were both significantly increased.The plastic hinge region at the bottom of the CFST limb did not form a yield ring until the end of the test,and there was no apparent structural damage.The main aftershock aggravated the cumulative damage of the structure,and the structural stiffness degradation phenomenon was obvious.After experiencing one main shock(intensity 9 rare)and two equal-strength aftershocks,the elastic stiffness of the structure was reduced by about 50%compared with the initial elastic stiffness,while the maximum response displacement increased by 41%.Through the calculation of the strength and deformation of CFST lattice columns under various seismic conditions,it is further shown that this type of structure has sufficient strength reserves and good deformability and can still maintain a certain bearing capacity after many strong earthquakes.CFST lattice columns have a great application prospect in bridge engineering in high-intensity areas in China.

关 键 词：钢管混凝土格构柱 平缀管 拟动力试验 主余震 抗震性能 

分 类 号：TU398.9[建筑科学—结构工程]