节能砌块隐形密框墙体受力性能理论分析

Theory analysis for force transferring performance of energy-saving block and invisible multi-ribbed frame wall

应用Ansys结构有限元分析软件,针对以前建立的节能砌块隐形密框墙体非线性有限元模型,通过参数化分析,研究剪跨比、轴压比和钢筋配筋量对墙体承载力以及刚度的影响,并研究墙体中框格单独的受力性能以及框格与砌块共同作用机理。研究结果表明:随着剪跨比的增加,墙体刚度下降幅度越大,墙体的极限承载力逐渐降低至趋于稳定;随着轴压比的增加,墙体的3个阶段的刚度以及墙体的极限承载力都有所增加;随着配筋量的增加,墙体刚度略有提高,但增幅有限,墙体的极限承载力有不同幅度的提高;纯框格的破坏模式为框架的受弯破坏,在4个角点的弯矩值最大,弯矩起控制作用,在4个角区出现了塑性铰后,结构变为机动体系,承载力下降;隐形密框和砌块的协同工作,有效地减小了框格破坏程度,对肋梁肋柱工作性能有很大的保护作用。

Based on the parametric analysis by means of nonlinear finite element model（FEM） program,the factors which may influence bearing capacity and stiffness of wall were theoretically studied with the created finite element model for energy-saving block and invisible multi-ribbed frame,including shear-span ratio,axial compression ratio and reinforcement;furthermore,single force transferring performance of box grid and interaction between energy-saving block and invisible multi-ribbed frame were studied too.The results show that with the increase of shear-span ratio,the decline of wall stiffness is greater,and the ultimate capacity decreases gradually till to a stable level;with the increase of axial compression ratio,the three-stage-stiffness and the ultimate capacity of wall increase to a certain degree;with the increase of reinforcement,the wall stiffness slightly increases but limited,and the ultimate capacity of the wall increases.Pure box grid failure mode is for frame bending damage,the moment values are the greatest in the four corner areas and the moment plays a main role,the structure becomes a mobile system and bearing capacity decreases after the four corner areas occur to plastic hinges;invisible multi-ribbed frame and block work together to effectively reduce the damage degree of the box grid,which has great protection for the working performance of rib beam and rib column.