中南大学学报（自然科学版）2018，Vol.49Issue(5)：1244-1253,10.DOI:10.11817/j.issn.1672-7207.2018.05.028
单层体外预应力钢筋混凝土框架抗倒塌试验研究
Experimental study on collapse performance of one-story reinforced concrete frames using external prestressing tendons
摘要
Abstract
Experimental study of two single-story two-span reinforced concrete (RC) frames using external prestressing tendons was carried out to study the collapse behavior after middle-column loss. The applied load process of model frame was analyzed. A method for analyzing variation of external prestressing tendon stresses based on the structural deformation was proposed and the formula for calculating ultimate load of RC frames using external prestressing tendons was derived. The results show that progressive collapse of RC frames using external prestressing tendons after middle column loss involves four stages, i.e., elastic stage, elastic-plastic stage, compression concrete damage stage and catenary stage, in which the structure sustains and redistributes loads through the mechanism of hinge action and catenary action. Collapse resistance of RC frames with external prestressing tendons under catenary mechanism is mainly determined by the stiffness and strength of the horizontal restraint of the column. When restraint is weak, collapse resistance of RC frames with external prestressing tendons decreases with the increase of vertical displacement. External prestressing tendons improve cracking load, the peak load in arch stage and ultimate load in catenary stage of RC frames. The calculated results from the proposed formula is in good agreement with the test results, indicating that the formula can be used to estimate ultimate bearing capacity of the catenary action.关键词
体外预应力钢筋混凝土框架/连续倒塌/静力试验/悬链线作用/预应力Key words
RC frames using external prestressing tendons/progressive collapse/static test/catenary action/prestressing分类
建筑与水利引用本文复制引用
范云蕾,王杰,王皓磊..单层体外预应力钢筋混凝土框架抗倒塌试验研究[J].中南大学学报（自然科学版）,2018,49(5):1244-1253,10.基金项目
国家自然科学基金资助项目(51308556)(Project(51308556)supported by the National Natural Science Foundation of China) （51308556）
