预应力平板-异形柱结构抗震性能试验研究
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摘要
目前关于混凝土异形柱、短肢剪力墙及节点的抗震性能研究工作已开展得较为充分,但对它们与无黏结预应力平板所组成的整体结构的抗震性能还不甚清楚,为此采用拟静力试验方法对2个六柱一板单层整体结构模型在水平低周反复荷载作用下的开裂破坏全过程,以及各项抗震性能指标进行了试验研究。模型缩尺比例为1∶2.5,2个试件的板采用了不同的预应力筋布置方式,异形柱和短肢墙采用了不同的抗震等级、截面尺寸和配筋率。结果表明:2个试件的各构件开裂时间和裂缝程度有所不同,但各构件的屈服破坏顺序是一致的,都形成了梁端塑性铰-板屈服铰线屈服机构,最终为延性破坏。滞回环具有典型的梭形特征,后期抗力与刚度下降平缓,变形和耗能能力良好,梁柱节点构造措施可靠,一字形短肢墙的早期裂缝控制应进一步研究,建议对其采用较高的抗震等级设计。
Now the study on the concrete column with special section shape,the short-leg wall and the joint is extensively developed.However,when they are considered with the unbonded prestressed slab together,the seismic performance of the whole structure has not been enough clarified.So we adopted the pseudostatic test to study and analyze the whole crackingfailure process and each seismic performance index,based on two 1∶2.5-scale single-floor structure models of six columns-one slab under low-frequency reversed cyclic loading.The prestressed reinforcements in two specimen slabs were adopted with different collocations.The column with special section shape and the short-leg wall have different seismic grades,section dimensions and reinforcement ratios.The result indicates that the crazing time and the crack degree of each member for two specimens are different,but the yield failure order of each member is same,all form yield mechanism with beam end plasticity hinge and slab yield hinge line,and finally is ductile failure.The hysteretic loops present the typical shuttle-form character,the resistance and the rigidity decline gently,and the deformation and the capacity of dissipating energy are all right.The tectonic measure of beam-column joint is dependable;the control of forepart crack should be more studied for "—" shaped short-leg wall,and the authors suggest adopting higher seismic grade to design it.
Now the study on the concrete column with special section shape,the short-leg wall and the joint is extensively developed.However,when they are considered with the unbonded prestressed slab together,the seismic performance of the whole structure has not been enough clarified.So we adopted the pseudostatic test to study and analyze the whole crackingfailure process and each seismic performance index,based on two 1∶2.5-scale single-floor structure models of six columns-one slab under low-frequency reversed cyclic loading.The prestressed reinforcements in two specimen slabs were adopted with different collocations.The column with special section shape and the short-leg wall have different seismic grades,section dimensions and reinforcement ratios.The result indicates that the crazing time and the crack degree of each member for two specimens are different,but the yield failure order of each member is same,all form yield mechanism with beam end plasticity hinge and slab yield hinge line,and finally is ductile failure.The hysteretic loops present the typical shuttle-form character,the resistance and the rigidity decline gently,and the deformation and the capacity of dissipating energy are all right.The tectonic measure of beam-column joint is dependable;the control of forepart crack should be more studied for "—" shaped short-leg wall,and the authors suggest adopting higher seismic grade to design it.
引文
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[14]扬建军,王金,王茂,等.现浇钢筋混凝土空心无梁楼盖在不同荷载工况下受力性能试验研究[J].铁道科学与工程学报,2004,1(2):88-91.
[15]吕志涛.现代预应力设计[M].北京:中国建筑工业出版社,1998.
[16]JGJ92-2004.无黏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.
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[18]GB50011-2001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[2]黑龙江龙电置业公司.无黏结预应力创造大空间灵活分隔住宅[J].建筑学报,2001,(7):50-51.
[3]曹万林,王光远,吴建有,等.周期反复荷载作用下钢筋混凝土十字形柱的性能[J].地震工程与工程振动,1994,14(3):60-67.
[4]曹万林,王光远,庞国新,等.轻质填充墙异型柱边框架抗震性能试验研究[J].地震工程与工程振动,1997,17(2):106-112.
[5]肖建庄,黄珏,李杰,等.异型柱框架结构抗震设计研究[J].地震工程与工程振动,2003,23(2):85-88.
[6]李青宁,王宁,蔡卫宁.T形短肢剪力墙弹塑性模型及地震反应分析[J].地震工程与工程振动,2004,24(2):69-74.
[7]Hawkins N M.Lateral load resistance of unbonded post-tensioned flat plate construction[J].PCI Journal.,1981,26(1):94-115.
[8]Franklin S O.The Punching Behavior of Unbonded Post-Tensioned Flat Plates[C].The Institution of Civil Engineers,1982,73:609-631.
[9]陶学康,王逸,陈文义,等.无黏结部分预应力带状布束的九柱四板荷载试验[J].建筑结构,1995(7):38-42.
[10]房贞政,陈国栋.大开间无黏结预应力混凝土板的模型试验[J].建筑结构,1999(8):7-9.
[11]扬建军,成洁筠,王金,等.现浇混凝土空心楼盖的试验研究[J].建筑结构,2006,36(3):71-74.
[12]郑文忠,詹界东.不同预应力筋布筋形式双向板的受力性能及承载力计算[J].土木工程学报,2002,35(6):48-52.
[13]吴转琴,李佩勋,尚仁杰,等.现浇预应力复合楼盖结构试验研究[J].工业建筑增刊,2002,77-84.
[14]扬建军,王金,王茂,等.现浇钢筋混凝土空心无梁楼盖在不同荷载工况下受力性能试验研究[J].铁道科学与工程学报,2004,1(2):88-91.
[15]吕志涛.现代预应力设计[M].北京:中国建筑工业出版社,1998.
[16]JGJ92-2004.无黏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.
[17]陈定外,译.结构用欧洲规范—混凝土结构设计[S].北京:中国建筑科学研究院结构所,1995.
[18]GB50011-2001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
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