密肋壁板结构计算模型及静力弹塑性反应分析

Calculation model and nonlinear static analysis for muliti-ribbed slab structure

结合前期密肋复合墙体与密肋壁板结构的试验研究,将密肋复合墙体中砌块等效为均匀受力的斜压杆,推导出等效斜压杆的弹塑性应力-应变公式,提出在等效斜压杆中设置轴向塑性铰,由此建立密肋复合墙体的弹塑性计算模型;研究密肋复合墙体的弹塑性屈服机制;建立密肋壁板结构的弹塑性计算模型,并对结构进行静力弹塑性反应分析;最后提出密肋壁板结构抗震性能评估方法.理论分析和试验表明:采用等效斜压杆模型对密肋复合墙体进行分析能较好的反映墙体"三阶段"破坏特性;建立的结构弹塑性计算模型能较好地模拟密肋壁板结构的真实破坏过程,为结构的抗震性能评估及弹塑性动力反应分析提供简化的力学模型.

According to the previous experimental study of multi-ribbed composite walls and multi-ribbed slab structures, a uniform oblique compression bar under uniaxial compression is employed to be equivalent to the filler block in the multi- ribbed composite wall. On this basis, the formula of elastic-plastic strain-stress for equivalent oblique compression bar is deduced, and the axial plastic hinge of the bar put forward. Then the elastic-plastic mathematical mode of the multi-ribbed composite wall is built. Moreover, the elastic-plastic yielding mechanism of the multi-ribbed composite wall is analyzed. The elastic-plastic calculation model of multi-ribbed slab structure is established, and the static elastic-plastic response analysis on the structure is performed. Finally, the assessment method for the seismic performance of the structure is presented. Theoretical analysis and test research show that adopting equivalent oblique compression bar model for analyzing the multi-ribbed composite wall can better reflect the three-stage damage of the wall. Meanwhile, the elastic-plastic calculation model of multi-ribbed slab structure proposed above can be effectively utilized to simulate the real failure process of the structure, which can provide the simplified mechanical mode for the seismic performance assessment and elastic-plastic dynamic response analysis of the structure.