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(1 國網(wǎng)河南省電力公司經(jīng)濟技術研究院, 鄭州 450052;2 河南工業(yè)大學土木工程學院, 鄭州 450001)
摘要: 為研究分布式連接全裝配 RC 樓蓋(DCPCD)中板縫連接對樓蓋振動特性的影響,進行了 2 個 DCPCD 試件和 1 個現(xiàn)澆樓蓋試件在四邊簡支條件下的對比試驗. 采用錘擊法對 3 個試件進行模態(tài)試驗,研究板縫連接件對DCPCD 的模態(tài)振型、阻尼比和自振頻率等模態(tài)參數(shù)的影響,并施加多種人行荷載激勵,研究板縫連接件對 DCPCD振動響應的影響. 結果表明:板縫連接件可有效提高 DCPCD 的整體性,降低結構阻尼比,增大自振頻率,大幅降低振動加速度;對基于正交雙向異性板振動理論得出的 DCPCD 自振頻率和峰值加速度的理論方法進行計算對比,與試驗值吻合良好;分析了不同邊界支承條件對 DCPCD 舒適度的影響,可通過改變邊界支承條件使 DCPCD 滿足舒適度要求;基于舒適度和經(jīng)濟性的考慮,建議橫縱向剛度比取值在 0. 3~ 0. 75 之間.
關鍵詞: 全裝配式 RC 樓蓋; 干式連接件; 振動特性試驗; 舒適度; 支承條件; 剛度比
中圖分類號:TU375. 2 文獻標志碼:A 文章編號: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
∗國家自然科學基金(52278172),國網(wǎng)河南省電力公司科技項目(5217L0200005).
第一作者:肖波,碩士,高級工程師,主要從事結構分析與設計,Email:623566119@ qq. com.
[引用本文] 肖波,王文康,龐瑞,等. 板縫連接對全裝配 RC 樓蓋豎向振動特性的影響研究[J]. 建筑結構,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.
