- 摘 要
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(1 湖南大学土木工程学院, 长沙 410082; 2 广西华蓝设计集团有限公司, 南宁 530011)
[摘要]在已完成的16根无粘结预应力混凝土梁低周反复荷载试验的基础上,对其中2根对称布置无粘结预应力筋混凝土梁进行了分析,建立了对称布置无粘结预应力筋混凝土梁的弯矩曲率恢复力模型。基于此恢复力模型,采用虚梁法编制程序计算了对称布置无粘结预应力筋混凝土梁的弯矩挠度滞回曲线,分析了日本学者MUGURUMA H所做的对称布置无粘结预应力筋混凝土梁的弯矩挠度滞回曲线,计算结果和试验结果吻合良好。弯矩\|曲率恢复力模型的建立为对称布置无粘结预应力筋混凝土梁的抗震性能研究奠定了基础,具有理论和工程实际意义。
[关键词]对称布置无粘结预应力筋混凝土梁; 低周反复荷载; 弯矩曲率恢复力模型; 弯矩挠度滞回曲线
中图分类号:TU378.2 文献标识码:A 文章编号:1002-848X(2015)04-0068-05
Research on restoring force model of unbonded prestressed concrete beams with symmetrical tendons
Tang Changhui1, Liu Dongming1, Li Yun2
(1 College of Civil Engineering, Hunan University, Changsha 410082, China;2 Guangxi Hualan Group Co., Ltd., Nanning 530011, China)
Abstract:Based on completed tests of sixteen unbonded prestressed concrete beams under low cyclic reversed loading, two unbonded prestressed concrete beams with symmetrical tendons were analyzed. The momentcurvature restoring force model of unbonded prestressed concrete beams with symmetrical tendons was presented on the base of the experiment. According to the model, a program was developed with virtual beam method. Using the program, momentdeflection hysteretic loops of the two tested beams and unbonded prestressed concrete beams with symmetrical tendons tested by Hiroshi MUGURUMA H were calculated analyzed. The calculation results agree reasonably with experiment result.The momentcurvature
restoring force model can provide theoretical basis for researching the seismic performance of unbonded prestressed concrete beams with symmetrical tendons and has theory and actual project significance.
Keywords:unbonded prestressed concrete beam with symmetrical tendon; low cyclic loading; momentcurvature restoring force model; momentdeflection hysteretic loop
*国家自然科学基金项目(51278179)。
作者简介:唐昌辉,博士,副教授,Email:tchui2010@126.com。
参考文献
[1]JGJ 140—2004 预应力混凝土结构抗震设计规程[S].北京:中国建筑工业出版社, 2004.
[2]JGJ 92—2004 无粘结预应力混凝土结构技术规程[S].北京:中国建筑工业出版社,2005.
[3]PARK R, THOMPSON K J. Cyclic load tests on prestressed and partially prestressed beamcolumn joints [J]. Journal of PCI, 1977, 22(5): 84110.
[4]MUGURUMA H. 第3種プレストレストコンクリート梁の力学的性質に関する基礎研究[J]. Proceedings of JCI, 1980, 2 (1): 381384.
[5]唐昌辉.无粘结预应力混凝土梁和型钢混凝土柱的试验与研究[D].长沙:湖南大学,2003.
[6]唐昌辉,叶林,赵铸.无粘结部分预应力混凝土梁恢复力模型的研究[J].自然灾害学报,2014, 23(1): 202209.
[7]张曙.无粘结部分预应力混凝土梁强度、裂缝和变形的研究[D].长沙:湖南大学,1986.
[8]唐昌辉,易伟建,沈蒲生,等.低周反复荷载作用下无粘结部分预应力混凝土梁受弯性能的试验研究[J].建筑结构学报, 2003, 24(1): 1925.
[9]BLAKELY R, PARK R. Prestressed concrete sections with cyclic flexure[J]. Journal of the Structural Division, ASCE, 1973, 99(8): 17171743.
[10]吕西林,金国芳,吴晓涵.钢筋混凝土结构非线性有限元理论与应用[M].上海:同济大学出版社, 2002.