型钢再生混凝土柱正截面承载力试验及数值模拟

为研究型钢再生混凝土柱的正截面承载力,对7个试件进行低周反复加载试验,观察了试件的受力过程和破坏形态,获得了试件的承载力和弯矩-转角滞回曲线,分析了再生粗骨料取代率、轴压比和体积配箍率对试件正截面承载力的影响。在试验研究的基础上,利用数值积分法编写型钢再生混凝土柱的正截面承载力分析程序,得到构件的N-M相关曲线及正截面极限承载力,计算结果与试验结果吻合较好。利用数值模拟程序对构件的N-M相关曲线进行参数分析,获得了混凝土强度等级、型钢强度、配钢率和加载角度的影响规律。

TESTING AND NUMERICAL SIMULATION OF THE NORMAL CROSS-SECTION BEARING CAPACITY OF STEEL REINFORCED RECYCLED CONCRETE COLUMNS

In order to study the normal cross-section bearing capacity of steel reinforced recycled concrete columns, 7 specimens were tested under low cyclic reversed loading. The mechanical processes and failure modes were observed, and the bearing capacity of normal cross-section and bending moment-drift angle hysteretic loops were obtained. The influences of the recycled coarse aggregate replacement ratio, axial compression ratio, and stirrup ratio on the normal cross-section bearing capacity were analyzed. Based on the experimental study, an analysis program for normal cross-section bearing capacity was compiled by using a numerical integration method, through which the N-M interaction curve and ultimate strength of steel reinforced recycled concrete columns can be calculated. The theoretical results and experimental results show good agreement. Furthermore, with the program, parametric analysis on N-M interaction curves were carried out, and the laws governing the influence of concrete strength grade, steel strength, steel ratio, and loading angle were obtained.