摘要
为研究碳纤维(CFRP)丝股粘结型锚具锚固性能及内部受力状态,该文设计了19丝CFRP丝股粘结型锚具并对其进行了静载试验。3个试件的CFRP丝间距分别为4mm、2mm和1mm;试验对锚固区CFRP丝应变和CFRP丝-锚筒的相对位移进行测量;通过静载试验实测并结合理论计算分析了粘结型锚具的锚固性能、粘结应力分布情况及变化规律。研究结果表明:19丝CFRP丝股粘结型锚具的锚固效率为94.8%;CFRP丝间距对锚固效率影响较大,CFRP丝间距越小,锚固性能越好;CFRP丝-锚筒的相对位移主要是由填充介质的整体刚体滑移造成的;锚固区CFRP丝表面的粘结应力峰值随荷载增加而逐渐由锚具的受荷端向自由端移动,粘结应力峰值随荷载增加而逐渐增大;CFRP丝表面压应力对锚固效率影响较大。
In order to investigate the anchorage performance and internal stress distribution of multiple CFRP tendon bond-type anchorage,multiple CFRP tendon bond-type anchorage with 19 tendons was designed and static performance was tested.Three specimens were tested in which the space between CFRP tendons of the specimens were 4mm,2mm and 1mm,respectively.The CFRP tendon strain in anchorage zone and the relative displacement of the anchorage barrel were recorded at each loading level.The anchorage performance,the bond tress distribution of CFRP tendon-mortar interface and the bond stress variation were investigated through static loading testing and theoretical analyzing.The results show that the anchorage efficiency coefficient of tested anchorage is 94.8%.The space between CFRP tendons makes great impact to the anchorage performance,the higher concentration of CFRP tendons the better anchorage performance.The rigid body displacement of mortar leads to the major relative displacement of CFRP tendon-anchorage barrel.The peak bond stress shifts from the load end to the free end of bond-type anchorage and increases gradually when the loading level increases.The surface compressive stress of CFRP tendon in anchorage zone is also a greater impact to the anchorage performance.
出处
《工程力学》
EI
CSCD
北大核心
2011年第7期165-170,179,共7页
Engineering Mechanics
基金
国家863计划(2008AA11Z101)
关键词
桥梁工程
锚具
静载试验
CFRP
粘结
bridge engineering
anchorage
static load test
carbon fiber reinforced plastic
bonding
