【摘要】 在GSA标准分析法基础上提出两阶段分析法,采用ANSYS/LS-DYNA建立了一个7层底框砌体结构的三维有限元模型,对爆炸荷载作用下底框砌体结构连续倒塌过程进行模拟。根据爆炸荷载引起的结构局部性破坏,对局部采取适当的防爆抗爆措施防止结构的连续倒塌。通过改变砌体材料的强度等级、纵向配筋率、粘贴玻璃纤维复合材料、粘贴钢板、柱网尺寸、墙体开洞以及底框层数,得到底框砌体结构在爆炸荷载作用下的响应规律和破坏情况以及结构墙体中砌体材料、钢筋的应力和位移随时间的变化规律,为底框砌体结构的防爆设计提供理论基础和有价值的参考数据。更多还原

【Abstract】 The three dimensional model of masonry buildings with bottom frames and seven-storey was set up with explicit dynamic analytical software LS-DYNA.GSA criteria analysis method was carried out in the numerical analysis of the masonry buildings with bottom frames’ progressive collapse.There are some disadvantages of GSA criteria analysis method in the aspect of the simulative truth,so two-stage analysis method was created against the disadvantages of GSA criteria analysis method.The structural damage was first at local,and the local damage was the reason why the progressive collapse of the structure happened.If we use some countermeasures to prevent the structural local damages,the progressive collapse of the structure may not happen. Various masonry material strengths,reinforced ratios of the vertical bar,GFRP strengthening, steel plate strengthening,arrangement of columns,wall openings and building storey number of the bottom frames were selected to verify the model.The dynamic response laws and destructive condition of the masonry buildings with bottom frames under explosive shock were obtained.The rule of the stress and the displacement of the masonry and reinforcing bars were given at the same time.All these works offer the theoretical principle and meritorious reference data for anti-explosion design of masonry buildings with bottom frames.更多还原