【摘要】 抗震夯土墙结构是一种面向小型民居的建筑结构形式,已推广应用于云南、四川等传统夯土聚集地区。为进一步研究其抗震性能,设计制作了1个平面尺寸为3.6 m×3.0 m、层高为2.45 m的抗震夯土墙结构试验模型并开展振动台试验研究。试验中选取El Centro波、鲁甸(LD)波,分别在X、Y向输入,得到结构在峰值加速度为0.10g、0.22g、0.40g、0.62g以及0.90g的地震激励下的模型频谱特性、加速度、位移、扭转角和钢筋应变变化。研究结果表明:随着地震激励增大,试验模型自振频率变化不大,X向为5.371～6.348 Hz,Y向为7.813 Hz(未出现变化);最大动力放大系数对应屋面处,在1.403～2.336间;模型在峰值加速度0.10g、0.22g、0.40g、0.62g以及0.90g的地震激励下,最大层间位移角分别为1/1 506、1/1 081、1/655、1/388和1/289;经一系列地震激励作用后,试验模型出现少量裂缝,但未出现有损安全的破坏,表明该结构体系具有很好的抗震性能,能够满足现行建筑抗震设计规范的要求。更多还原

【Abstract】 The seismic-resistant rammed earth wall structure is a novel building structure designed for small house.The structure has been promoted and implemented in traditional rammed earth regions, such as Yunnan and Sichuan.A test model, intended to an in-depth investigation of the seismic performance of the structure, was designed and analyzed with a plan size of 3. 6 m×3. 0 m and a floor height of 2. 45 m. In the experiment, El Centro waves and Ludian(LD) waves were applied as ground motion inputs in the X and Y directions, respectively. The model spectral characteristics, acceleration response, displacement response, torsion response and rebar strain variation of the structure were measured under seismic excitations with peak accelerations of 0. 10g, 0. 22g, 0. 40g, 0. 62g and 0. 90g. The results indicate that as seismic excitation increases, the self-resonance frequency of the experimental model exhibits minimal variation. In the X direction, it ranges from 5. 371 Hz to 6. 348 Hz, while in the Y direction, it remains constant at 7. 813 Hz. The maximum dynamic amplification coefficient occurs at the roof, ranging from 1. 403to 2. 336. Under seismic excitations with peak accelerations of 0. 10g, 0. 22g, 0. 40g, 0. 62g, and 0. 90g, the maximum inter-story displacement angles of the model are 1/1 506, 1/1 081, 1/655, 1/388, and 1/289,respectively. After a series of seismic excitations, a small number of cracks were observed in the test model, but no structural damage compromising safety occurred. This indicates that the structural system has good seismic performance and meets the requirements of code for seismic design of buildings.更多还原