夹心秸秆砌块砌体动力特性研究

Study on dynamic characteristics of sandwich concrete block masonry filled with compacted wheat straw block

通过将冷压秸秆压缩块置于混凝土小型空心砌块孔腔内组成的夹心秸秆砌块,具有保温节能、承重等特点。以某夹心秸秆砌块砌体建筑为研究对象,从抗震节能一体化出发,该砌体增设多道芯柱、圈梁。利用超低频测振仪开展了脉动法测试结构振动特性。基于有限元软件建立三维精细化模型采用子空间迭代算法进行模态提取,与振动实测对比误差在7%以内,且振型相似;在此基础之上进行模态扩展分析与反应谱分析,讨论芯柱、圈梁等构造措施对结构振动特性和抗震性能影响,可为同类建筑动力特性研究提供借鉴。

Sandwich masonry units,which is filled with compacted wheat straw block in the block cavity,have strong loading bearing capacities and energy efficiency. One sandwich concrete block masonry building is selected as research object,in which some core columns and ring beams are embedded from the perspective of energy efficiency and seismic safety. The structural vibration characteristics were tested by means of pulsatile test with the use of ultra-low frequency vibrometer. Three-dimensional refinement model is set up by the finite element software and its modal is calculated by the subspace iteration algorithm method. The difference between test results and calculated results are less than 7 percent and the modes are similar. Based on them,modal extended analysis and response spectrum analysis are carried out to discuss the influence of seismic details, such as core column and ring beams,on the dynamic characteristics and seismic performance of the structure. The results and methods can provide beneficial references for study on dynamic characteristics of the masonry.