摘要
针对目前混凝土双向密肋装配整体式空心楼盖刚度和变形计算存在较大误差的问题,对混凝土双向密肋现浇空心楼盖单元、混凝土双向密肋装配整体式空心楼盖单元及无顶板和底板的混凝土肋梁单元进行了静载试验研究。试验结果表明,混凝土双向密肋装配整体式空心楼盖单元的顶板及侧板与现浇混凝土密肋梁粘结良好,预制顶板和底板对试验单元的刚度有明显的贡献,装配整体式单元的受力性能与现浇单元相似。根据试验数据及有限元模拟结果验证了装配整体式单元顶板剪力滞后效应的存在,在此基础上提出了考虑预制顶板和底板作用的楼盖截面刚度计算方法。从双向密肋楼盖的计算方法———查表法和交叉梁法出发,对混凝土双向密肋装配整体式空心楼盖的弹性刚度及支座边界条件进行修正,提出更为精确合理的刚度和变形计算方法。用本文提出的计算方法对已有的足尺楼盖试件进行计算,得出的计算结果与试验结果吻合良好。
In response to the problem that the calculation results for the stiffness and deformation of the assembled monolithic concrete hollow floor with two-way ribs are not accurate enough,this paper made a study on the static load tests of three slab elements,which were a cast-in-situ concrete hollow slab element with two-way ribs,an assembled monolithic slab element and a ribbed beams slab element.The test results indicate that the prefabricated top and side plates of the hollow box have a good bond with cast-in-situ concrete ribs.The roof and floor can make an obvious contribution to the stiffness of the slab element.The mechanical performance of the cast-in-situ concrete hollow slab element with two-way ribs is similar to that of the assembled monolithic slab element.The phenomenon that the shear lag exists in the prefabricated monolithic top plate is confirmed according to the results of test and finite element analysis.A computational method considering the effect of prefabricated top and bottom plates was proposed for the calculation of sectional stiffness of floor slabs.The elastic stiffness and boundary support condition of the new type slabs were revised based on the look-up table method and intersecting beam method of the concrete waffle slabs.Then a new computational method for the calculation of stiffness and deformation which can yield more accurate and reasonable results was proposed.The calculation results of the test specimens using the proposed method agree well with the test results.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2011年第9期75-83,共9页
Journal of Building Structures
基金
国家自然科学基金项目(50978090)
国家"十一五"科技支撑计划项目(2006BAJ02B07)
关键词
双向密肋楼盖
装配整体式
剪力滞后
刚度
concrete waffle slab
assembled monolithic
shear lag
rigidity
作者简介
作者简介：周绪红（1956-），男，湖南南县人，工学博士，教授。E—mail：zhouxuhong@126．com
