新型土坯墙建筑地震模拟振动台试验研究

Shaking table test study on seismic simulation for new adobe wall buildings

为研究新型土坯墙结构体系的抗震性能。设计制作了一个平面尺寸为3.6 m×3.0 m,层高2.45 m的一层足尺新型土坯墙建筑试验模型进行振动台试验,试验选取El Centro波和云南鲁甸波分别在X、Y向进行单向地震波加载,实测了试验模型在峰值加速度为0.10、0.22、0.40、0.62、0.90 g的地震作用下的频谱特性、加速度反应、位移反应、扭转反应和暗柱钢筋应变反应的规律。研究结果表明:模型仅在超9度罕遇烈度时发生轻微破坏,其他地震激励下未出现明显开裂、破坏现象;随着地震激励增大,模型自振频率无明显变化,加速度放大系数逐渐降低,最大放大系数为屋面处的3.666;层间位移角在峰值加速度为0.62 g时达到最大为1/399;因模型基本均匀对称,其结构整体扭转效应不明显;暗柱钢筋的应变值随地震激励的增大逐渐增加,但钢筋应变值较小,钢筋的性能未能充分发挥。综上所述,该新型土坯墙模型具有良好的抗震性能,研究为扩大土坯建筑应用范围提供了试验依据。

In order to study the seismic performance of the new adobe wall structural system.A one-story foot-scale new adobe wall building test model with plan size of 3.6 m×3.0 m and storey height of 2.45 m was designed and fabricated for the shaking table test,and El Centro waves and Yunnan Ludian(LD)waves were selected for the test to carry out unidirectional loading of seismic waves in the X and Y directions,respectively,and the test model was measured to be under the peak acceleration of 0.10、0.22、0.40、0.62、0.90 g,the spectral characteristics,acceleration response,displacement response,torsion response,and strain response of the dark column reinforcement were measured.The results show that:the model is only slightly damaged in the exceeding 9 degree rarefied intensity,and there is no obvious cracking and damage phenomenon under other seismic excitations.With the increase of seismic excitation,there is no obvious change in the self-resonance frequency of the model,and the acceleration amplification coefficient gradually decreases,with the maximum amplification coefficient of 3.666 at the roof.The angle of the interstorey displacement reaches the maximum of 1/399 when the peak acceleration is 0.62 g.The overall structural torsion is 1.599 at the peak acceleration of 0.62 g,and the displacement angle of 0.62 g reaches the maximum of 1/399.Because of the basic homogeneous symmetry,the structural torsion is 0.666 at the roof.Because the model is basically homogeneous and symmetric,the overall torsional effect of the structure is not obvious.The strain value of the steel reinforcement of the dark columns increases gradually with the increase of the seismic excitation,but the strain value of the steel reinforcement is small and the performance of the steel reinforcement fails to give full play.In summary,the new adobe wall model has good seismic performance,and the study provides a test basis for expanding the application range of adobe buildings.