外框密肋复合墙抗剪机理及承载力计算

在外框密肋复合墙低周反复荷载试验的基础上,对墙体的抗剪机理进行了分析;依据极限平衡理论引入砌体抗剪承载力影响系数和框格承载力影响系数,同时考虑RC框格与填充砌块之间的相互作用;提出了外框密肋复合墙抗剪承载力计算公式;本文公式计算结果与试验结果、有限元数值模拟结果进行了比较。研究表明:本文基于水平薄弱层破坏建立的外框密肋复合墙抗剪公式较传统基于斜截面破坏建立的抗剪公式具有更明确的物理意义;本文公式计算精度较高,与试验结果、有限元数值模拟结果相差不到10%。

Shear mechanism and capacity calculation for the multi-grid composite wall with outer frame

The multi-grid composite wall with outer frame is one type seismic walls consisting of internal RC composite wall and outer frame,and is important member of load-bearing and resistances to lateral force in the frame-composite wall structures.Study the shear mechanism and capacity calculation method of the multi-grid composite wall with outer frame is the premise for seismic design of the structure.Firstly,based on the experiments,shear mechanism of the wall is analyzed.Secondly,according to the ultimate balance theory,formula for calculating the shear load-bearing capacity of the frame-composite wall is proposed,and comparison to the formula of homogeneous material wall is made.Finally,the accuracy of the formula is verified by the test and finite element simulation results.The research results obtained indicate that the formula proposed has more definite physical meaning than the formula which is established according to oblique section failure mechanism.It is accurate and simple,and can be used in practice for designing the frame-composite wall structures as a reference.