加气混凝土承重墙抗震性能试验与有限元分析

Finite Element Analysis and Seismic Performance Tests of an Aerated Concrete Bearing Wall

在加气混凝土墙体抗震性能试验基础上,采用有限元软件ABAQUS对加气混凝土承重墙进行分离式建模计算,并通过spring2连接来考虑砌块与粘结剂滑移关系,并将承载力-位移曲线结果与加气混凝土承重墙体试验曲线进行对比,在初步验证模拟可行的情况下,进行参数分析来研究垂直正应力、砌块强度、粘结剂强度等参数变化对墙体承载力、变形能力的影响,研究得出轴压比在0.15-0.33间,墙片破坏形式为剪压破坏;砌块强度的变化对墙片水平承载能力的影响较为明显;而粘结剂强度的增加,对墙片水平承载能力的影响不明显,但有可能降低墙片在极限荷载下的水平位移,上述研究成果为加气混凝土承重墙进一步试验研究与抗震计算提供必要依据。

Based on the seismic performance test,an aerated concrete bearing wall was modeling separately considering the relative slip between the block and the mortar by element type SPRING2 in the finite element software ABAQUS.The FEA result and the test results of the curves of aerated concrete bearing wall was com-pared.After the feasibility of simulations was verified,further parametric analyses were studied about the vari-ation of vertical normal stress,block strength,and adhesive strength,influencing the bearing capacity and de-formation of an aerated concrete wall.It can be concluded that the wall damage is shear compression failure when axial load ratio ranges from 0.15 to 0.33;changes of block strength level have obvious impact on the wall horizontal bearing capacity,and improvements of adhesive strength have little impact to wall horizontal bearing capacity,possibly reducing the horizontal displacement of ultimate load.The above researches provide necessary basis for the further experimental study and seismic calculations.