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Design method for steel framed members with variable cross-section considering inelastic earthquake response

考虑非弹性地震反应的变截面钢框架构件设计方法

基本信息

批准号：
07555442
负责人：
KOTOGUCHI Hisao
金额：
$ 0.7万
依托单位：
Daido Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

This project studies the inelastic earthquake response of steel portal frames with variable cross-section numerically and experimentally. The conclusions can be summarized as follows :(1) Experimental study1) Six test specimens for variable cross-section frames were tested up to failure under the condition of constant vertical and alternating horizontal loads.2) The three different collapse modes appeared due to the variable cross-section.3) These test results were arranged to compare with the numerical results.(2) Numerical study1) Transformation matrix of web plates in shear is derived in order to consider the elasto-plastic behavior of beam-to-column connections as well as the vicinity of the center of beam.2) Some appropriate parameters with respect to yielding of beam, columns and connections are defined to classify the collapse modes of frames.3) The collapse mode with the plastic deformation only within the middle cross-section of columns is unfavorable, because the significant cumulative plastic strain leads to the local buckling.4) The center part of beam cannot aid in energy dissipation without heavy damage due to the small resistance force.5) The plasticity of the center of beam depends on the beam span-column depth ratio.6) the damage at the center of beams of steel framed piers in Hyogoken-Nanbu Earthquake is highly related to the difference between the resistance forces of beams with variable cross-section and panel zones.7) The favorable collapse pattern of portal frames is to restrict the plastic deformation within the column base part and panel zones of beam-to-column connections.8) The fundamental idea for designing the variable cross-section is to dissipate energy in the cross-section with large resistant stress-resultants such as column base barts and panel zones.

本项目对变截面钢门式刚架的非弹性地震反应进行了数值模拟和实验研究。主要结论如下：（1）试验研究1）对6个变截面框架试件进行了竖向荷载恒定和水平荷载交替作用下的破坏试验; 2）变截面框架出现了3种不同的破坏模式; 3）将试验结果与数值计算结果进行了对比。(2)数值研究1）推导了腹板受剪时的转换矩阵，以考虑梁柱节点的弹塑性性能以及梁中心附近的弹塑性性能; 2）确定了影响梁屈服的适当参数，3）仅在框架中跨处发生塑性变形的破坏模式，即框架中跨处发生塑性变形的破坏模式;柱截面不利，4）梁中心部位的抗力较小，不能起到消能的作用而不产生严重的破坏; 5）梁中心部位的塑性取决于梁的跨柱高度比; 6）兵库县钢框架桥墩梁中心部位的破坏情况表明，梁中心部位的破坏与梁的跨柱高度比有关。南部地震的发生与变截面梁和板区的抗力差异密切相关。7）门式刚架的有利倒塌模式是限制梁柱连接的柱脚部分和板区的塑性变形。具有大的抵抗应力合成物的截面，如柱脚和面板区域。