竖向钢板带加固砖砌体轴心受压性能试验研究  

Experimental investigation on axial compressive performance of brick masonry strengthened by vertical steel strips

作　　者：敬登虎[1] 叶辛 鲍宁 JING Denghu;YE Xin;BAO Ning(School of Civil Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学土木工程学院,江苏南京211189

出　　处：《建筑结构学报》2022年第12期102-112,共11页Journal of Building Structures

基　　金：江苏省自然科学基金项目(BK20171361);国家自然科学基金项目(52178118)。

摘　　要：采用正交钢板带加固砖砌体墙可以有效提高其受力性能,但竖向钢板带受压时易发生局部屈曲。为研究竖向钢板带与砖砌体的协同受压工作机理,对竖向钢板带加固砖砌体的轴心受压性能进行试验研究,设计了1个未加固试件和9个竖向钢板带加固试件,影响参数包括钢板带宽度、钢板带厚度、钢板带中预压应力,分析了试件的开裂与峰值荷载、荷载-位移曲线、钢板带的应变及其所承担荷载的变化规律。结果表明:竖向钢板带加固砖砌体可以有效提高其峰值荷载和轴向刚度;螺栓杆对孔壁的挤压力会使得砖砌体提前出现裂缝;钢板带中施加预压应力可提高加固砖砌体的开裂荷载,但较大的预压应力会降低峰值荷载;加固砖砌体的荷载-位移曲线呈二次抛物线型;在预压应力和截面尺寸适当的情况下,增加钢板带的宽度或厚度可取得同样的加固效果。最后,提出了竖向钢板带加固砖砌体的轴心受压承载力计算方法,其对峰值荷载具有较好的预测精度。Strengthening a brick masonry wall with orthogonal steel strips can effectively improve its mechanical performance, but the vertical steel strips often suffer local buckling after being compressed. In order to study the cooperative compression mechanism between the vertical steel strips and brick masonry, the axial compressive performance of brick masonry strengthened by vertical steel strips was experimentally studied. One unstrengthened specimen and nine strengthened specimens using vertical steel strips were designed. The test parameters included the width and thickness of the steel strips as well as the pre-compression stress in the steel strips. The cracking and peak loads, load-displacement curves, development of strains and loads in the steel strips were analyzed. The results show that the peak load and axial stiffness of brick masonry strengthened by vertical steel strips can be effectively improved. The squeezing force of bolt rods on the hole wall would make the brick masonry crack in advance. The pre-compression stress applied in the steel strips can increase the cracking load of the strengthened specimen, but a larger pre-compression stress would reduce the peak load. The load-displacement curve of the strengthened specimen is of a quadratic parabolic shape. With appropriate pre-compression stress and section size, increasing the width or thickness of the steel strips can achieve the same strengthening effect. Finally, the calculation method to predict the axially compressive bearing capacity of brick masonry strengthened by vertical steel strips was proposed, which can provide close prediction of the peak load.

关 键 词：砖砌体 竖向钢板带 预压应力 轴心受压试验 局部屈曲 

分 类 号：TU365[建筑科学—结构工程] TU317.1