交叉预应力竹木框架抗侧力性能研究-《建筑科学与工程学报》

文章信息/Info

Author(s):: SU Yi, SUN Da-qing, ZONG Sheng-jing, HUANG Dong-sheng; School of Civil Engineering, Nanjing Forestry University

Keywords:: bamboo frame; antilateral performance; prestress; pseudo static experiment; elasto-plastic analysis

摘要:: 针对传统竹木框架抗侧性能不足的特点，提出了一种交叉预应力竹木框架，进行了低周反复试验，并通过有限元软件HYPERMESH和ABAQUS进行了弹塑性分析。结果表明：采用实体螺栓建模能够模拟出竹木框架滞回曲线典型的捏拢特征，但滞回曲线面积和试验相比偏小；采用交叉预应力拉索加固后竹木框架极限承载力提高了1.9倍，水平位移降低到了原来的1/2.7；时程分析中交叉预应力竹木框架最大侧移仅为传统竹木框架的1/5.4；随着拉索直径的增加，框架刚度增加程度逐渐减小，耗能能力逐渐下降；增大预应力能够提高框架刚度，但预应力增大到6 kN以后，预应力对框架刚度没有明显的影响，耗能曲线随着预应力提高呈反U形，具有极值。

Abstract:: According to the characteristics of traditional bamboo frame with less anti-lateral performance, a kind of cross prestressed bamboo frame was presented. Low cyclic loading test was conducted and elasto-plastic analysis was carried out by finite element software HYPERMESH and ABAQUS. The results show that the typical pinching characteristics of hysteresis curves of bamboo frame can be simulated by the modeling of solid bolt,but the hysteresis curve areas are smaller than those of test. When the frame was reinforced by cross prestressed cable, the ultimate bearing capacity increases to 1.9 times and the horizontal displacement reduces to 1/2.7 of the original displacement.The maximum lateral displacement of the cross prestressed bamboo frame is only 1/5.4 of the traditional bamboo frame in time history analysis.With the increase of radius of the cable, the increased degree of stiffness is gradually reduced and the energy consumption is gradually decreased.Increasing the prestress can increase the stiffness, but the prestress increases to 6 kN later,the prestressed size has no significant effect on stiffness,the energy dissipation curve shows the inverse U type, ]which has extreme value.