塑性铰区碳纤维约束高强混凝土圆柱抗震性能的试验研究  

Experimental research on seismic performance of high strength concrete circular column confined with carbon fiber sheets at plastic hinge zone

作　　者：王震宇[1] 芦学磊[1] 李伟[1] 王代玉[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《建筑结构》2009年第2期21-24,51,共5页Building Structure

基　　金：国家自然科学基金资助(青年科学基金项目;50408010);北京市重点实验室开放基金项目(EESR2005-3)

摘　　要：对6根剪跨比为3.5的碳纤维约束柱及2根未约束的对比柱进行了伪静力试验研究,考察了轴压比、碳纤维包裹方式、混凝土强度等参数对碳纤维约束高强混凝土圆柱破坏机理及抗震性能的影响规律。试验结果表明,高轴压比下高强混凝土圆柱在塑性铰区采用碳纤维约束后的破坏形态主要表现为弯曲破坏模式,柱的承载力和延性得到较大提高;对于剪跨比大于3的高强混凝土圆柱,当塑性铰区碳纤维布包裹长度为1.2D^1.8D(D为柱直径)范围内时,其抗震性能即可达到较好的效果,且对较高强度等级混凝土的约束效果更好。Six high strength concrete circular columns confined with CFS and two normal columns are designed and tested under axial load and cyclic lateral force. The shear span ratio of all columns is 3.5. The influence of three parameters, including axial compression ratio, pattern of CFS wrapping and concrete strength, on the ductile behavior and ability of energy dissipation of columns are taken into account. The main failure patterns as well as seismic performance of columns are analyzed. Test results indicate that under high axial compressive load and lateral force, flexural failures are the main pattern of high strength concrete circular columns confined with CFS at plastic hinge zone. Wrapping CFS at plastic hinge zone of column can observably improve its ductility, energy dissipation and seismic performance. For columns which its shear span ratio are greater than 3. O, when the length of wrapped CFS is 1.2 D to 1.8 D （ D is the diameter of circular column） at plastic hinge zone, the seismic performance of columns can be improved effectively and for higher concrete strength the effect of CFS restraint is better than that of lower concrete strength.

关 键 词：碳纤维布 高强混凝土 圆柱 高轴压比 抗震性能 

分 类 号：TU528.31[建筑科学—建筑技术科学] TU352.11