南京理工大学学报（自然科学版）
南京理工大學學報（自然科學版）
남경리공대학학보（자연과학판）
JOURNAL OF NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY
2014年
6期
811-817
,共7页
预应力筋%应力腐蚀%混凝土梁%人工坑蚀%静力%开裂荷载%极限荷载%抗弯刚度
預應力觔%應力腐蝕%混凝土樑%人工坑蝕%靜力%開裂荷載%極限荷載%抗彎剛度
예응력근%응력부식%혼응토량%인공갱식%정력%개렬하재%겁한하재%항만강도
prestressed reinforcement%stress corrosion%prestressed concrete beams%pit corrosion%static%cracking load%ultimate load%stiffness
为研究预应力筋应力腐蚀对预应力混凝土梁承载力和耐久性的影响，设计制作了7根用人工坑蚀模拟预应力筋受应力腐蚀的预应力混凝土梁，进行静力受力性能试验。试验结果表明：预应力筋坑蚀后的预应力混凝土梁的开裂荷载、极限荷载低于普通预应力混凝土梁，并随坑蚀深度的增大而下降；增大预应力度可提高应力腐蚀预应力筋混凝土梁的开裂荷载；增大非预应力钢筋的配筋率可提高预应力混凝土梁的开裂荷载、极限荷载；随着坑蚀的增大，构件抗弯刚度迅速下降；提高预应力度可减缓构件抗弯刚度的下降，而增大非预应力钢筋的配筋率对抗弯刚度的影响则较小。根据该文预应力筋坑蚀后的预应力混凝土梁极限承载力计算公式得到的理论值与实测值相吻合，可供工程实践参考。
為研究預應力觔應力腐蝕對預應力混凝土樑承載力和耐久性的影響，設計製作瞭7根用人工坑蝕模擬預應力觔受應力腐蝕的預應力混凝土樑，進行靜力受力性能試驗。試驗結果錶明：預應力觔坑蝕後的預應力混凝土樑的開裂荷載、極限荷載低于普通預應力混凝土樑，併隨坑蝕深度的增大而下降；增大預應力度可提高應力腐蝕預應力觔混凝土樑的開裂荷載；增大非預應力鋼觔的配觔率可提高預應力混凝土樑的開裂荷載、極限荷載；隨著坑蝕的增大，構件抗彎剛度迅速下降；提高預應力度可減緩構件抗彎剛度的下降，而增大非預應力鋼觔的配觔率對抗彎剛度的影響則較小。根據該文預應力觔坑蝕後的預應力混凝土樑極限承載力計算公式得到的理論值與實測值相吻閤，可供工程實踐參攷。
위연구예응력근응력부식대예응력혼응토량승재력화내구성적영향，설계제작료7근용인공갱식모의예응력근수응력부식적예응력혼응토량，진행정력수력성능시험。시험결과표명：예응력근갱식후적예응력혼응토량적개렬하재、겁한하재저우보통예응력혼응토량，병수갱식심도적증대이하강；증대예응력도가제고응력부식예응력근혼응토량적개렬하재；증대비예응력강근적배근솔가제고예응력혼응토량적개렬하재、겁한하재；수착갱식적증대，구건항만강도신속하강；제고예응력도가감완구건항만강도적하강，이증대비예응력강근적배근솔대항만강도적영향칙교소。근거해문예응력근갱식후적예응력혼응토량겁한승재력계산공식득도적이론치여실측치상문합，가공공정실천삼고。
In order to study the influences of stress corrosion of prestressed reinforcement on the bearing capacity and durability of prestressed concrete beams,7 prestressed concrete beams undergone simulated stress corrosion,i. e. pit corrosion,are tested by static flexural experiments. The experimental results show that the cracking load and ultimate load of prestressed concrete beams after stress corrosion of prestressed reinforcement are less than those of normal prestressed concrete beams and decrease with the increase of corrosion depth. Cracking load increases with the increase of prestress degree. Cracking load and ultimate load increase with the increase of non-prestressed reinforcement ratio. Stiffness decreases rapidly with the increase of corrosion depth. The decrease of the stiffness is slow down with the increase of prestress degree while non-prestressed reinforcement ratio has no obvious influence. The ultimate load calculation formulae of prestressed concrete beams after stress corrosion of prestressed reinforcement is given,and verified by experimental value,which can be used in practical engineering.
