• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Behavior of normal and high strength confined concrete columns with and without stubs.
【24h】

Behavior of normal and high strength confined concrete columns with and without stubs.

机译：普通和高强度承压混凝土柱（带有和不带有短桩）的行为。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

An experimental research to investigate the behavior of normal-strength concrete (NSC) and high-strength concrete (HSC) columns confined with rectilinear ties was undertaken. Variables considered were axial load level, steel configuration, amount of lateral steel, concrete strength, and presence of stub. The primary objectives of this research were to relate column performance to various design parameters, evaluate the confinement provisions of the ACI Code, and suggest needed changes in the design.; Nine large size specimens, three HSC prismatic and six NSC nonprismatic, were tested under cyclic lateral load while subjected to constant axial load. The HSC specimens were 12 x 12 x 90 in. (305 x 305 x 2,438 mm) whereas NSC specimens were 12 x 12 x 58 in. (305 x 305 x 1,437 mm) columns with 20 x 30 x 32 in. (508 x 762 x 813 mm) stubs. Results of three HSC nonprismatic specimens recently tested at the University of Houston were also effectively used in the analysis. In the test program, applied axial load varied between 0.47f{dollar}sb{lcub}rm c{rcub}spprime{dollar}A{dollar}sb{lcub}rm g{rcub}{dollar} and 0.88f{dollar}sb{lcub}rm c{rcub}spprime{dollar}A{dollar}sb{lcub}rm g{rcub}{dollar}, lateral steel content varied from 1.30% to 3.06%, and concrete strength ranged from 4,540 psi. (31.3 MPa) to 8,570 psi. (59.1 MPa). Three different steel configurations were used.; Test results indicated significant improvement in strength and ductility due to an increase in lateral steel content for both NSC and HSC columns. Ductility reduced drastically due to increase in axial load. Buckling of longitudinal bars and opening of 90{dollar}spcirc{dollar} hooks of crossties affected column performance adversely. HSC columns showed significantly less ductility than NSC columns. The presence of stub imparted flexural strength enhancement (about 20% of theoretical capacity) to the adjacent critical sections. Section moment capacity increased by up to 60% due to confinement in NSC columns. Sheikh and Uzumeri model and modified Kent and Park model predicted test results reasonably well.; The experimental results strongly suggest that the Code required amount of lateral steel may be excessive at low axial load levels but unconservative at high axial load levels. A design procedure was suggested which relates the required amount of lateral steel in tied columns to axial load level and column performance. The proposed method is calibrated against a large number of realistically-sized specimens, which emphasized its reliability. Limiting conditions for the use of certain steel configurations were also suggested.
机译：进行了试验研究以直线关系约束的高强度混凝土（NSC）和高强度混凝土（HSC）柱的性能。所考虑的变量包括轴向载荷水平，钢构型，侧向钢量，混凝土强度和桩端。该研究的主要目标是将色谱柱性能与各种设计参数相关联，评估ACI规范的限制规定，并提出设计中需要进行的更改。在周期性的横向载荷下，在承受恒定轴向载荷的情况下，对9个大尺寸试样（三个HSC棱柱形和六个NSC非棱柱形）进行了测试。 HSC标​​本为12 x 12 x 90 in。（305 x 305 x 2,438 mm），而NSC标本为12 x 12 x 58 in。（305 x 305 x 1,437 mm）立柱，具有20 x 30 x 32 in。（508 x 762 x 813 mm）。最近在休斯敦大学测试的三个HSC非棱柱标本的结果也有效地用于了分析。在测试程序中，施加的轴向载荷在0.47f {dollar} sb {lcub} rm c {rcub} spprime {dollar} A {dollar} sb {lcub} rm g {rcub} {dollar}和0.88f {dollar之间变化sb {lcub} rm c {rcub} spprime {dollar} A {dollar} sb {lcub} rm g {rcub} {dollar}，侧向钢含量为1.30％至3.06％，混凝土强度为4,540 psi。 （31.3 MPa）至8,570 psi。 （59.1 MPa）。使用了三种不同的钢结构。测试结果表明，由于NSC和HSC立柱的侧向钢含量增加，强度和延展性显着提高。由于轴向载荷的增加，延展性大大降低。纵向杆的屈曲和90个十字交叉钩的打开会严重影响色谱柱性能。 HSC色谱柱的延展性明显低于NSC色谱柱。短管的存在使相邻的临界区具有抗弯强度的提高（约为理论容量的20％）。由于限制在NSC色谱柱中，因此截面力矩能力提高了60％。 Sheikh和Uzumeri模型以及改进的Kent和Park模型可以很好地预测测试结果。实验结果强烈表明，在低轴向载荷水平下，规范要求的侧向钢用量可能过多，而在高轴向载荷水平下则不保守。建议了一种设计程序，该程序将系紧柱中所需的侧向钢量与轴向载荷水平和柱性能联系起来。所提出的方法针对大量实际大小的标本进行了校准，从而强调了其可靠性。还建议使用某些钢构型的限制条件。

著录项

  • 作者

    Khoury, Shafik Shawky.;

  • 作者单位

    University of Houston.;

  • 授予单位 University of Houston.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 1991
  • 页码 375 p.
  • 总页数 375
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号