改进型碳纤维复材筋用锚具静载测试及黏结应力分布
发布时间：2018-11-06 12:05
【摘要】：为研究设计参数对改进型锚具力学性能、破坏形式的影响及锚固区黏结应力分布状况,对11组CFRP筋改进型锚具进行了静载测试。研究结果表明:锚具的破坏形式有筋材拉断、钢管破坏和胶体滑移,其中筋材拉断为理想形式。可通过测试钢管外表面应变,计算黏结应力得出其分布情况。在极限状态2 mm厚钢管,400 mm长,55 mm长夹片的GM-9锚具黏结应力分布与光滑曲线模型基本吻合,但有区别,所用测试方法可行;3 mm厚钢管,400 mm长,分别为50,80,90 mm长夹片的GM-1、GM-2、GM-3加载端黏结应力较大,异于光滑曲线模型;光滑曲线模型适用于破坏形式为胶体滑移的试件。建议设计参数为:钢管厚3 mm、长400 mm,夹片长55 mm、倾角6.5°、夹持位置为中间;胶体厚2 mm;可有效锚固单根直径为8 mm的CFRP筋,其极限承载力高达151.5 k N。
[Abstract]:In order to study the influence of design parameters on the mechanical properties, failure mode and bond stress distribution in the Anchorage zone, 11 groups of modified CFRP reinforced Anchorage were tested under static load. The results show that the failure modes of Anchorage include steel bar break, steel pipe failure and colloidal slip, among which the steel bar tensile fracture is the ideal form. The distribution of bonding stress can be obtained by measuring the strain on the outer surface of the steel pipe. The stress distribution of GM-9 Anchorage under the limit state of 2 mm thick steel pipe, 400 mm long and 55 mm long clamp is basically consistent with the smooth curve model, but there are differences between the two models, and the testing method is feasible. 3 mm thick steel pipe, 400 mm long, respectively, the GM-1,GM-2,GM-3 loading end bond stress is larger, which is different from the smooth curve model, and the smooth curve model is suitable for the specimen with the failure form of colloidal slippage. It is suggested that the design parameters are as follows: steel tube thickness 3 mm, long 400 mm, clip length 55 mm, dip angle 6.5 掳, clamping position in the middle, colloid thickness 2 mm; can effectively anchor a single CFRP bar with 8 mm diameter, its ultimate bearing capacity is up to 151.5 KN.
【作者单位】： 江苏大学土木工程与力学学院;南京理工大学泰州科技学院土木工程学院;
【基金】：国家自然科学基金项目(51478209;51508235) 江苏省自然科学基金项目(BK20140553)
【分类号】：TU599
本文编号：2314211
[Abstract]:In order to study the influence of design parameters on the mechanical properties, failure mode and bond stress distribution in the Anchorage zone, 11 groups of modified CFRP reinforced Anchorage were tested under static load. The results show that the failure modes of Anchorage include steel bar break, steel pipe failure and colloidal slip, among which the steel bar tensile fracture is the ideal form. The distribution of bonding stress can be obtained by measuring the strain on the outer surface of the steel pipe. The stress distribution of GM-9 Anchorage under the limit state of 2 mm thick steel pipe, 400 mm long and 55 mm long clamp is basically consistent with the smooth curve model, but there are differences between the two models, and the testing method is feasible. 3 mm thick steel pipe, 400 mm long, respectively, the GM-1,GM-2,GM-3 loading end bond stress is larger, which is different from the smooth curve model, and the smooth curve model is suitable for the specimen with the failure form of colloidal slippage. It is suggested that the design parameters are as follows: steel tube thickness 3 mm, long 400 mm, clip length 55 mm, dip angle 6.5 掳, clamping position in the middle, colloid thickness 2 mm; can effectively anchor a single CFRP bar with 8 mm diameter, its ultimate bearing capacity is up to 151.5 KN.
【作者单位】： 江苏大学土木工程与力学学院;南京理工大学泰州科技学院土木工程学院;
【基金】：国家自然科学基金项目(51478209;51508235) 江苏省自然科学基金项目(BK20140553)
【分类号】：TU599
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