(1 国网河南省电力公司经济技术研究院, 郑州 450052;2 河南工业大学土木工程学院, 郑州 450001)

摘要: 为研究分布式连接全装配 RC 楼盖(DCPCD)中板缝连接对楼盖振动特性的影响,进行了 2 个 DCPCD 试件和 1 个现浇楼盖试件在四边简支条件下的对比试验. 采用锤击法对 3 个试件进行模态试验,研究板缝连接件对DCPCD 的模态振型、阻尼比和自振频率等模态参数的影响,并施加多种人行荷载激励,研究板缝连接件对 DCPCD振动响应的影响. 结果表明:板缝连接件可有效提高 DCPCD 的整体性,降低结构阻尼比,增大自振频率,大幅降低振动加速度;对基于正交双向异性板振动理论得出的 DCPCD 自振频率和峰值加速度的理论方法进行计算对比,与试验值吻合良好;分析了不同边界支承条件对 DCPCD 舒适度的影响,可通过改变边界支承条件使 DCPCD 满足舒适度要求;基于舒适度和经济性的考虑,建议横纵向刚度比取值在 0. 3~ 0. 75 之间.

关键词: 全装配式 RC 楼盖; 干式连接件; 振动特性试验; 舒适度; 支承条件; 刚度比

中图分类号:TU375. 2 文献标志码:A 文章编号:1002-848X(2023)04-0143-06

DOI:10. 19701 / j. jzjg. LS210103

Research on influence of slab joint connector on vertical vibration characteristics of untopped precast RC floor

XIAO Bo1, WANG Wenkang2, PANG Rui2, JING Chuan1, XU Ke2

(1 State Grid Henan Economic Research Institute, Zhengzhou 450052, China; 2 College of Civil Engineering,Henan University of Technology, Zhengzhou 450001, China)

Abstract: To study the influence of the slab joint connectors in discretely connected precast RC diaphragm (DCPCD) onthe vibration characteristics of the floor, a comparative test of two DCPCD specimens and a cast-in-situ slab specimen underthe condition of four-sided simply supported was carried out. The modal test was carried out on three specimens by thehammering method to study the influence of the slab joint connectors on the modal parameters such as the modal shape,damping ratio and natural frequency of the DCPCD. A variety of pedestrian load excitations were applied to study theinfluence of the slab joint connectors on the vibration response of the DCPCD. The results show that the slab jointconnectors can effectively improve the integrity of the DCPCD, reduce the structural damping ratio, increase the naturalfrequency, and greatly reduce the vibration acceleration. Comparing the theoretical method of DCPCD natural frequencyand peak acceleration based on the vibration theory of orthogonal two-way anisotropic plate, it is in good agreement with theexperimental value. The influence of different boundary support conditions on the serviceability of DCPCD was analyzed,and the DCPCD can meet the serviceability requirements by changing the boundary support conditions. Based onserviceability and economical considerations, it is recommended that the stiffness ratio between the orthogonal slab layingdirection and the slab laying direction be between 0. 3~ 0. 75.

Keywords:untopped precast RC floor; dry connector; vibration characteristic test; serviceability; support condition;stiffness ratio

∗国家自然科学基金(52278172),国网河南省电力公司科技项目(5217L0200005).

第一作者:肖波,硕士,高级工程师,主要从事结构分析与设计,Email:623566119@ qq. com.

[引用本文] 肖波,王文康,庞瑞,等. 板缝连接对全装配 RC 楼盖竖向振动特性的影响研究[J]. 建筑结构,2023,53(4):143-148,73. XIAO Bo,WANG Wenkang,PANG Rui,et al. Research on influence of slab joint connector on verticalvibration characteristics of untopped precast RC floor[J]. Building Structure,2023,53(4):143-148,73.