为研究意杨旋切板胶合木(laminated veneer lumber,LVL)正交肋梁箱型楼盖竖向动力特性和人致激励响应规律,对6个足尺箱型楼盖进行了模态测试和人致振动试验。基于振动响应(峰值加速度和加速度振级)结果,分析了箱型楼盖的构造形式和人致荷载工况对楼盖振动响应的影响。结果表明:刨花板(oriented strand board,OSB)厚度、肋梁高度和短肋梁间距分别为18.3、285 mm和600 mm的箱型楼盖具有最大的第一阶自振频率和阻尼比,呈现最优动力特性;箱型楼盖的峰值加速度随着OSB覆面板数量和肋梁高度的增加而减小,随着OSB覆面板厚度和短肋梁间距的增大而增大;随着步频和行走人数的增加,楼盖的峰值加速度逐渐增大;当步频相同时,箱型楼盖在单人跳跃下的峰值加速度比原地踏步或连续行走时的大。提出了箱型楼盖一阶自振频率和在单人行走或跳跃下峰值加速度的计算方法,计算值与试验值吻合良好。
Abstract
To study the vertical dynamic characteristics and the law of human-induced excitation response of poplar laminated veneer lumber (LVL) orthogonal ribbed box floor, six full-scale poplar LVL orthogonal ribbed box floors were tested by the modal test and the human-induced vibration test. Based on the peak acceleration and acceleration vibration level, the effects of the configurations of the box floor and the human-induced load conditions on the vibration response were analyzed. The results indicate that the box floor with the thickness of the oriented strand board (OSB) slab, the height of the rib beam, and the distance of the short rib beams of 18.3 mm, 285 mm, and 600 mm exhibits the largest first-order natural vibration frequency and damping ratio, as well as the best dynamic characteristics.The peak acceleration of box floors decreases with increasement of the OSB slab numbers and the height of rib beams, whereas it increases with increasement of the thickness of OSB slabs and the spacing of the shorter rib. The peak acceleration increases with increasement of the stride frequency and the number of people walking.When the stride frequency is the same, the peak acceleration of the box floor under the one-person jumping is larger than that of stepping in place or continuous walking. The calculating method for the first-order natural frequency and the peak acceleration of the box floor under one-person walking or jumping are carried out, and the calculated results agree well with the experimental results.
关键词
正交肋梁箱型楼盖 /
意杨LVL /
环境激励 /
人致荷载激励 /
振动特性
{{custom_keyword}} /
Key words
orthogonal ribbed box floor /
poplar LVL /
environmental excitation /
pedestrian load excitation /
vibration characteristic
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 张占宜, 周海宾. 木楼盖人致振动性能浅谈[J]. 林产工业, 2020, 57(7): 19-23. (ZHANG Zhanyi, ZHOU Haibin. A tentative analysis on human-induced vibration performances of timber floors[J]. China Forest Products Industry, 2020, 57(7): 19-23. (in Chinese))
[2] JARNEROE K, BRANDT A, OLSSON A. Vibration properties of a timber floor assessed in laboratory and during construction [J]. Engineering Structures, 2015, 82(1): 44-54.
[3] AL-FOQAHA’A A A, COFER W F, FRIDLEY K J. Vibration design criterion for wood floors exposed to normal human activities [J]. Journal of Structural Engineering, 1999, 125(12): 1401-1406.
[4] STEFAN BERNARD E. Dynamic serviceability in lightweight engineered timber floors [J]. Journal of Structural Engineering, 2008, 134(2): 258-268.
[5] EBADI M M, DOUDAK G, SMITH I. Evaluation of floor vibration caused by human walking in a large glulam beam and deck floor [J]. Engineering Structures, 2019, 196: 109349.
[6] HUANG H Y, GAO Y, CHANG W S. Human-induced vibration of cross-laminated timber (CLT) floor under different boundary conditions [J]. Engineering Structures, 2020, 204: 110016.
[7] XIONG H B, KANG J H, LU X L. Field testing and investigation of the dynamic performance and comfort of timber floors [J]. Journal of Asian Architecture and Building Engineering, 2011, 10(2): 407-412.
[8] WECKENDORF J, USSHER E, SMITH I. Dynamic response of CLT plate systems in the context of timber and hybrid construction [J]. Composite Structures, 2016, 157:412-423.
[9] SKINNER J, MARTINS C, BREGULLA J, et al. Concrete upgrade to improve the vibration response of timber floors [J]. Proceedings of the Institution of Civil Engineers-Structures and Buildings, 2014, 167 (9): 559-568.
[10]DOS SANTOS P G G, DE JESUS MARTINS C E, SKINNER J, et al. Modal frequencies of a reinforced timber-concrete composite floor: testing and modeling [J]. Journal of Structural Engineering, 2015, 141(11): 04015029.
[11]YEOH D, FRAGIACOMO M, DE FRANCESCHI M, et al. State of the art on timber-concrete composite structures: literature review [J]. Journal of Structural Engineering, 2011, 137(10): 1085-1095.
[12]RIJAL R, SAMALI B, SHRESTHA R, et al.Experimental and analytical study on dynamic performance of timber-concrete composite beams [J]. Construction and Building Materials, 2015, 75: 46-53.
[13]NOR HAYATI A G, BRUCE D, MASSIMO F. Vibration susceptibility of multi-span LVL-concrete composite floors[C]∥11th World Conference on Timber Engineering. Trentino, Italy: Tress and Timber Institute, National Research Council, 2010: 361-367.
[14]DAVID O, CRISTIANO L. Experimental and numerical study on the bending response of a prefabricated composite CLT-steel floor module [J]. Engineering Structures, 2022, 260: 114278.
[15]AYESHA S, MD ABDULLAH A M, FARHAD A, et al.Cross-laminated timber-concrete composite structural floor system: a state-of-the-art review [J]. Engineering Failure Analysis, 2021,130:130105766.
[16]无疵小试样木材物理力学性质试验方法: GB/T 1927—2021 [S]. 北京: 中国标准出版社, 2021. (Test methods for physical and mechanical properties of small clear wood specimens: GB/T 1927—2021 [S]. Beijing: Standards Press of China, 2021. (in Chinese))
[17]金属材料 拉伸试验:第1部分: 室温试验方法: GB/T 228.1—2021 [S]. 北京: 中国标准出版社, 2021. (Metallic materials: tensile testing: part 1: method of test at room temperature: GB/T 228.1—2021 [S]. Beijing: Standards Press of China, 2021. (in Chinese))
[18]AISC/CISC. Steel design guide series 11: floor vibrations due to human activity [S]. Chicago: American Institute of Steel Construction, 1997: 8-13.
[19]孙崇芳. 新型全预制装配式楼盖竖向振动舒适度研究[D]. 南京: 东南大学, 2012: 20-23. (SUN Chongfang. Study on vertical vibration comfort of a new full-fabricated floor[D]. Nanjing: Southeast University, 2012: 20-23. (in Chinese))
[20]ISO. Evaluation of human exposure to whole-body vibration-continuous and shock-induced vibration in buildings:International standard 2631-2[S]. Geneva, Switzerland:International Standards Organization, 2003.
[21]高层建筑混凝土结构技术规程: JGJ 3—2010 [S]. 北京: 中国建筑工业出版社, 2010. (Technical specification for concrete structures of high-rise building: JGJ 3—2010 [S]. Beijing: China Architecture & Building Press, 2010. (in Chinese))
[22]European Committee for Standardization. General rules and rules for buildings: EN 1995-1-1: 2004 [S]. Brussels: European Committee for Standardization, 2004.
[23]高层民用建筑钢结构技术规程: JGJ 99—2015[S]. 北京: 中国建筑工业出版社, 2016. (Technical specification for steel structure of tall building: JGJ 99—2015 [S]. Beijing: China Architecture & Building Press, 2016. (in Chinese))
[24]钢-混凝土组合楼盖结构设计与施工规程: YB 9238—1992 [S]. 北京: 冶金工业出版社, 1992. (Design and construction specifications for steel-concrete composite floors: YB 9238—1992 [S]. Beijing: Metallurgical Industry Press, 1992. (in Chinese))
[25]木结构设计标准: GB 50005—2017[S]. 北京: 中国建筑工业出版社, 2017. (Standard for design of timber structures: GB 50005—2017 [S]. Beijing: China Architecture & Building Press, 2017. (in Chinese))
[26]陈隽, 王浩祺, 彭怡欣. 行走激励的傅里叶级数模型及其参数的实验研究[J]. 振动与冲击, 2014, 33(8): 11-15. (CHEN Jun, WANG Haoqi, PENG Yixin. Experimental investigation on Fourier-series model of walking load and its coefficients [J]. Journal of Vibration and Shock, 2014, 33(8): 11-15. (in Chinese))
[27]CHEN J, LI G, RACIC V. Acceleration response spectrum for predicting floor vibration due to occupants jumping [J]. Engineering Structures, 2016, 112: 71-80.
[28]刘军进, 肖从真, 潘宠平, 等. 跳跃和行走激励下的楼盖竖向振动反应分析[J]. 建筑结构, 2008, 38(11): 108-110. (LIU Junjin, XIAO Congzhen, PAN Chongping, et al. Investigation on response of floor vibration under jumping and walking excitation[J]. Building Structure, 2008, 38(11): 108-110. (in Chinese))
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
基金
国家自然科学基金项目(51878590)。
{{custom_fund}}
PDF(3436 KB)
京公网安备 11010802041942号 网络出版服务许可证（署）网出证（京）字第373号 出版物经营许可证：新出发京批字第版240007号 技术支持：北京玛格泰克科技发展有限公司 51La
