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EXPERIMENTAL STUDY ON REINFORCED CONCRETE BEAMS STRENGTHENED BY EXTERNALLY PRESTRESSED VERTICAL TENSIONING METHOD
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摘要: 对7根钢筋混凝土简支梁(2根对比梁、5根加固梁)进行3点加载试验,并通过试验数据,分析了不同张拉控制应力下各梁破坏形态、裂缝开裂情况及受力钢筋、体外预应力筋应变变化规律。试验中采用了加载前施加预应力、加载至开裂卸载施加预应力、加载至开裂不卸载施加预应力3种工况,以模拟实际工程中各种状况。最后,参照各国无粘结预应力筋极限应力理论及基于塑性铰的极限状态理论,研究试验梁的正截面抗弯极限弯矩的计算方法。通过对各国无粘结预应力筋极限应力的计算值对比表明,在二次效应影响较小的情况下,体外预应力结构可采用无粘结预应力结构的研究成果。Abstract: Seven reinforced concrete beams (two contrast beams and five externally prestressed beams) were tested.The fracture morphology, crack situation, and regularity of changing strain of steel bars and external tendons underdifferent stress of tension control were analyzed through exprerimental data. In order to simulate the conditions ofpractical projects, there were three kinds of test conditions in the experiment: 1 ) before loading prestress was appliedto beam; 2 ) loading to crack, then unloading and prestressing; 3 ) loading to crack, then not unloading andprestressing. Finally, according to ultimate stress theories of unbounded prestressed steel and ultimate condition theorybased on plastic hinge, it was studied the caculative method of ultimate bending moment. It was shown that theresearch achievements of unbounded prestressed structure could also apply to externally prestressed structure whensecond-order effect was small.
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Key words:
- external prestress /
- strengthening /
- anti-flexural capacity
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李延和.高效预应力加固法理论及应用[M].北京:科学出版社,2008. [2] 李晨光.体外预应力结构技术与工程应用[M].北京:中国建筑工业出版社,2008. [3] 牛斌.体外预应力混凝土极限状态分析[J].土木工程学报,2000(3):8-15. [4] 卫龙武,吕志涛,郭彤.建筑物评估、加固与改造[M].南京:江苏科学技术出版社,2006. [5] 孙海,黄鼎业,张平,等.体外预应力连续梁的受力性能研究与非线性分析[J].工业建筑,2000,30(4):34-37. [6] GB503672006混凝土结构加固设计规范[S]. [7] GB5015292混凝土结构试验方法标准[S]. [8] 王天稳.土木工程结构试验[M].武汉:武汉理工大学出版社,2006. [9] JGJ922004无粘结预应力混凝土结构技术规程[S]. -
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