摘要
预应力混凝土双T板是国内现行规范明确规定需进行性能检测试验的重点大型构件,其试验方法和检测指标是装配式混凝土结构构件检测中的难题。结合某全装配式停车楼项目,采用合理的支撑装置和分级加载方式,对4组共12个非标准预应力混凝土双T板进行了承载力、挠度及抗裂性能的检验。在试验基础上,从"设计需求"和"设计性能"两个方面,对预应力混凝土双T板的性能检测试验方法进行了对比分析,结果表明,所有试件荷载加载值均达荷载设计值约1.55倍,实测开裂荷载约是理论计算值的1.13~1.38倍,且皆高于1.17倍荷载标准值,小跨度和大跨度板的挠度分别为设计限值的13%~20%,53%~56%,基本全部满足"设计需求"检验标准。指出相关图集、规范中以"设计性能"为基础的检验思路对于实际工程应用要求过严,建议对于"设计性能"远大于"设计需求"的小跨构件采用基于"设计需求"的指标进行检验。
Prestressed concrete double tee slab is a key large-scale component that needs to be tested according to current domestic codes.Its test method and test index are difficult problems in the detection of components of prefabricated concrete structures.Combining with a fully prefabricated parking building project,the bearing capacity,deflection and crack resistance of four groups of 12 non-standard prestressed concrete double tee slabs were tested using reasonable supporting devices and multi-stage loading method.On the basis of the test,the performance testing methods of double tee slabs were compared and analyzed from two aspects of"design requirement"and"design performance".The results show that the load loading values of all specimens reach about 1.55 times of the load design values,and the measured cracking loads are about1.13~1.38 times of the theoretical values,and are all higher than the 1.17 times of load standard values.The deflections of small-span and large-span slabs are 13%~20%and 53%~56%of the design limits respectively,which basically meet the test standard of"design requirement".It is pointed out that the test ideas based on"design performance"in relevant construction drawings and specifications are too strict for practical engineering applications.It is suggested that the indexes based on"design requirement"can be used to test small-span components which have far greater"design performance"than the"design requirement".
作者
廖显东
马昕煦
李鑫
陈永亮
Liao Xiandong;Ma Xinxu;Li Xin;Chen Yongliang(China Construction Eighth Engineering Division Co.,Ltd.,Shanghai 200122,China)
出处
《建筑结构》
CSCD
北大核心
2019年第22期80-87,共8页
Building Structure
基金
“十三五”国家重点研发计划(2016YFC0701704)
中国建筑股份有限公司课题(CSCEC-2015-Z-11)
关键词
装配式
双T板
性能试验
加载方式
检测指标
prefabricated
double tee slab
performance test
loading pattern
test index
