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Deflection test and modal analysis of lightweight timber floors

Journal of Bioresources and Bioproducts 2021年第3期6卷 266-278页

作者： Xinyue Zhao Yujie Huang Haiyan Fu Yunlu Wang Zheng Wang Usama Sayed College of Materials and Engineering Nanjing Forestry UniversityNanjing210037China College of Civil Engineering Nanjing Forestry UniversityNanjing210037China

In order to meet the objective requirements of the safety and comfort of the modern lightweight timber floors,and strengthen the research on the coupling performance of the lightweight timber floors vibration characteristics and the building comfort,this article discusses the floor of a two-story prefabricated lightweight timber building demonstration *** this paper,the floor structure of a two-story light-weight wooden house has been carried out on structural calculation modal and experimental modal,static uniform load and concentrated load deflection value *** evaluation of the deflection value of the floor structure,the mode shape,the coupling of the fundamental frequency mode parameters,and the vibration comfort were also *** results show that the fundamental frequency simulation value,one-way modal test value and two-way modal test value of the floor structure all meet the requirements of BS-6472(BS6472-1:2008).That is,the floor structure is not lower than 8 Hz design requirements,and meets the frequency of BS-6472(BS6472-1:2008).The weighted root mean square acceleration is lower than the requirement of 0.45 m/s^(2);the first three natural frequencies of the floor structure calculated by the finite element simulation are 16.413,31.847 and 48.921 Hz,and the fundamental frequency mode is the bending vibration in the length and width *** second order is the bending mode in the length direction,and the third order is the bending mode in the width *** fundamental frequency of the two-way modal test of the floor structure is the first-order bending mode in the X direction;and the second-order natural frequency is the second-order bending vibration shape in the X *** the uniform load is mainly the weight of floor own,the simulated maximum deflection value is 1.0658 mm;the simulation is performed according to the standard value of 0.566 kN/m for the uniform load of the floor design,and the simulation is the largest.

关键词： Lightweight timber structure building floor structure Static load test Test mode Calculation mode Building comfort

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Experimental study of low-temperature electrical radiant floor heating system

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Journal of Southeast University(English Edition) 2010年第2期26卷 287-291页

作者：孔祥强李瑛胡松涛山东科技大学机械电子工程学院青岛266510 青岛理工大学环境与市政工程学院青岛266033

To evaluate the thermal performance of a low-temperature electrical radiant floor heating system,an experimental facility equipped with a constant temperature chamber and different specimen floors is designed and *** heating cable is installed in the floor slab with a unit-rated power of 30 W/***-four different schemes are worked out and tested,which include three kinds of composite floor structures and eight kinds of cable *** cable distances are 30,40,50,60,80,100,130,150 *** main affective factors of the thermal performance and their influencing regularity are *** experimental results show that the system has good stability and reliability,and the ratio of the radiation heat-transfer rate to the gross heat-transfer rate is greater than 50%.When the floor structure and the cable distance are fixed,the gross heat-transfer rate of the upper floor surface has a maximum value at an optimal cable *** the experimental conditions in this paper,the optimal cable distance is 50 mm.

关键词： electrical radiant floor heating floor structure cable distance thermal performance

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