钢筋混凝土梁塑性铰长度变化规律及尺寸效应

发布时间：2019-07-05 18:06

【摘要】：为了研究钢筋混凝土梁塑性铰长度随荷载的变化规律及其尺寸效应,依据15根不同截面尺寸的钢筋混凝土梁单调和低周往复加载试验结果,分别采用4种方法探索了塑性铰长度从屈服点到极限位移点的变化规律,研究了截面尺寸对梁试件塑性铰长度的影响.结果表明:屈服荷载后,随荷载的增加塑性铰长度逐渐增加;塑性铰长度表现出明显的尺寸效应.截面高度由200 mm增加到1 000 mm时,单调试件的峰值荷载点和极限位移点的相对塑性铰长度分别降低了40%和44%,低周往复加载试件则分别降低了38%和40%.在此基础上,提出的考虑截面高度影响系数的塑性铰长度计算值与试验值吻合较好.
文内图片：

图片说明：图７试件ＸＷ３－２截面曲率沿梁高的变化曲线逡逑（方法３）逡逑
[Abstract]:In order to study the variation of plastic hinge length with load and its size effect, based on the monotonic and low cycle reciprocating loading test results of 15 reinforced concrete beams with different section sizes, the variation of plastic hinge length from yield point to limit displacement point is explored by four methods, and the influence of section size on plastic joint length of beam specimen is studied. The results show that after yield load, the length of plastic hinge increases gradually with the increase of load, and the length of plastic hinge shows obvious size effect. When the section height increases from 200 mm to 1 000 mm, the relative plastic hinge length of the peak load point and the limit displacement point of the monotone specimen decreases by 40% and 44%, respectively, while that of the low cycle reciprocating loading specimen decreases by 38% and 40%, respectively. On this basis, the calculated value of plastic hinge length considering the influence coefficient of section height is in good agreement with the experimental value.
【作者单位】：北京工业大学城市与工程安全减灾教育部重点实验室;保定市城乡建筑设计院;石家庄经济学院勘查技术与工程学院;
【基金】：国家自然科学基金资助项目(51178014,50838001) 北京工业大学研究生科技基金资助项目(ykj-2014-10990)
【分类号】：TU375.1

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