基于OPENSEEs的螺栓连接预制装配剪力墙简化建模方法

为解决当前螺栓连接装配剪力墙仿真分析依赖实体单元建模造成的求解效率低下问题,本文基于分层壳单元和OPENSEEs中的CoupledZeroLength零长单元提出了螺栓连接预制装配剪力墙结构的简化建模方案,建立了拟静力抗震性能分析数值模型,并通过试验滞回曲线和骨架曲线验证了建模方法的有效性。结果表明该建模方案得到六片剪力墙的屈服荷载和峰值荷载与试验结果误差均在10%以内,滞回曲线的捏拢效应、刚度退化、强度退化特性均和试验吻合良好,剪力墙底部的外侧竖向钢筋应变以及连接钢框的水平和竖向滑移的仿真与试验对比,证实了CoupledZeroLength零长单元可以有效模拟螺栓滑移。这一切表明,简化建模案适用于不同剪跨比下的全装配和半装配预制装配剪力墙的弹塑性分析,可以为进一步研究螺栓连接装配剪力墙在超/高层结构的弹塑性分析提供参考。

Simplified modeling method of bolted-connection precast shear wall based on OPENSEEs

To solve the existing modeling over-reliance on solid elements and the resulting low solution efficiency for the bolted-connection precast shear walls, this paper proposed a simplified modeling method based on multi-layers shell element and the CoupledZeroLength element in OPENSEEs for bolted-connection precast shear wall; furthermore, the corresponding finite element models of quasi-static seismic performance analysis were established; finally, the effectiveness of the modeling method was verified by comparing with the experiment hysteretic curves and skeleton curves. The results show that the deviation of yield load and peak load of the six shear walls obtained by the modeling scheme and tests are within 10%. The pinching effect and stiffness degradation and strength degradation characteristics are in good agreement with the test. The experimental and simulation results were further compared with the external vertical steel bar strain at the bottom of the shear wall and the horizontal and vertical sliding of the connecting steel frame, confirming the applicability of the CoupledZeroLength simulating the bolt slip. This indicates that the simplified modeling method proposed in this paper is suitable for the elastoplastic analysis of of bolted-connection precast shear wall under different shear span ratios, which can be used for further research on the elastoplastic analysis of super/high-rise structures using bolted-connection precast shear wall.