宽扁梁现浇空心楼板竖向受力性能研究  

Study on vertical mechanical performance of cast-in-situ hollow floor with wide flat beam

作　　者：吕伟荣[1] 姚帅 李强[1] 吴彬 陈林[1] 石卫华[1] LU Weirong;YAO Shuai;LI Qiang;WU Bin;CHEN Lin;SHI Weihua(College of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学土木工程学院,湘潭411201

出　　处：《建筑结构》2020年第15期63-68,共6页Building Structure

基　　金：国家自然科学基金面上项目(51578235,51378202);国家自然科学基金青年项目(51608191)。

摘　　要：通过对湖南某高层建筑中局部两开间布置带宽扁梁的大跨度现浇空心楼板进行现场水箱加载试验,研究空心楼板在竖向荷载作用下的竖向位移、裂缝开展及分布特征,同时引入空心层分层壳模型对该空心楼板进行了有限元受力性能分析。结果表明,在设计活荷载作用下,带宽扁梁的大跨度现浇空心楼板具有足够的抗弯刚度和抗裂能力,能够满足现行规范正常使用极限状态的要求。但由于宽扁梁与空心楼板刚度比为1.5,宽扁梁对空心楼板无法形成有效嵌固而导致竖向荷载作用下,两开间试验现浇空心楼板的竖向位移曲线、裂缝分布与单块板基本相似。分析结果亦表明,空心层分层壳模型能较好地实现对空心楼板受力性能的模拟,当宽扁梁高与空心楼板厚度比hb/hs≥2时,宽扁梁可实现对空心楼板的有效约束,可供实际工程选用。On-site water tank loading test was carried out on a large-span cast-in-situ hollow floor with wide flat beams in two-space of a high-rise building in Hunan province to study the vertical displacement,crack development and distribution characteristics of the hollow floor under vertical load,the layered shell model of hollow layer was introduced to carry out finite element stress performance analysis of the hollow floor.The results show that the large-span cast-in-situ hollow floor with wide flat beams has sufficient bending stiffness and crack resistance under the design live load,and can meet the requirements of the normal use limit state of the current code.Due to the rigidity ratio of the wide flat beam to the hollow floor is 1.5,the wide flat beam cannot form an effective embedding on the hollow floor slab,and therefore led to that under the vertical load,the vertical displacement curve and crack distribution of the cast-in-situ hollow floor in the two-space test are basically similar to the single slab.The results of the analysis indicate that the hollow layered shell model can simulate well the performance of the hollow floor slab and it can be used for practical projects when the wide flat beam can effectively constrain the hollow floor as the ratio of the height of the wide flat beam to the thickness of the hollow floor(hb/hs)is greater than or equal to 2.

关 键 词：宽扁梁 大跨度空心楼板 水箱加载试验 空心层分层模型 

分 类 号：TU375.2[建筑科学—结构工程]