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针对密肋复合墙的特殊构造形式与破坏特点,提出了以水平薄弱层为分割面推导墙体受剪承载力的水平薄弱层破坏准则概念,并对其破坏机理进行了分析。以水平薄弱层破坏准则为基础,结合约束状态下填充砌块试件的荷载试验,采用理论与经验相结合的方法建立了密肋复合墙受剪承载力计算式,并利用不同框格数量密肋复合墙模型试验数据进行了验证,完善了墙体受剪承载力计算方法。研究表明:密肋复合墙的肋梁受剪作用及所受竖向荷载作用由计算式中肋柱受剪承载力、框格约束效应影响系数及压剪复合受力影响系数予以反映,其计算原理更加符合该类墙体的实际受力特点与破坏特征;依据水平薄弱层破坏准则建立的密肋复合墙受剪承载力计算式,物理意义明确,计算过程简便,满足一般工程精度要求。
According to the special structure and failure characteristics of multi-ribbed composite wall, the concept of failure criterion of horizontal weak layer which derives the shear capacity of the wall by using the horizontal weak layer as the dividing plane is proposed and the failure mechanism is analyzed. Based on the failure criterion of horizontal weak layer and combined with the load test of the filled block specimen under the restrained condition, the formula of shear capacity of multi-ribbed composite wall is established by the combination of theory and experience. Rib composite wall model test data to verify, improve the calculation method of shear strength of the wall. The results show that the shear effect and the vertical load of the ribbed beam in the multi-ribbed composite wall are reflected by the shear capacity of the ribbed columns, the influence coefficient of the gridding restraint effect and the combined effect of the compression and shear force. The principle is more in line with the actual stress characteristics and failure characteristics of the wall. According to the failure criterion of horizontal weak layer, the calculation formula of shear capacity of the multi-ribbed composite wall is clear, the physical meaning is clear, the calculation process is simple, and the accuracy of general engineering is met.