简支梁板中碳纤维筋应力增长影响因素

FACTORS OF AFFECTING STRESS INCREMENT IN CFRP TENDONS FOR SIMPLY SUPPORTED BEAMS AND SLABS

把握使用阶段无粘结CFRP筋应力增长规律是准确计算无粘结CFRP筋部分预应力混凝土梁板刚度及裂缝开展宽度的基础。为此,基于无粘结CFRP筋部分预应力混凝土简支梁板全过程分析程序,考察CFRP筋弹性模量与钢筋弹性模量比值、非预应力筋配筋指标、预应力筋配筋指标、加载方式、跨高比和无粘结CFRP筋布筋形式等参数对正常使用阶段简支梁板中无粘结CFRP筋应力增长的影响规律。

Comprehension of law of stress increment of unbonded CFRP tendons at service stage is the basis to exactly calculate stiffness and crack width of concrete beams and slabs partially prestressed with unbonded CFRP tendons. Based on full-range analysis programs of concrete simply supported beams and slabs partially prestressed with unbonded CFRP tendons, the basic factors such as the ratio of modulus of elasticity for CFRP tendon to that for steel, non-prestressed reinforcement index, prestressing reinforcement index, loading type, ratio of span to depth and profile of tendons affecting the law of stress in- crement of unbonded CFRP tendons at service stage are presented.