Flexural and Shear Strength of Prestressed Precast Hollow-Core Slabs

被引:39
作者
Rahman, M. K. [1 ]
Baluch, M. H. [2 ]
Said, M. K. [2 ]
Shazali, M. A. [3 ]
机构
[1] King Fahd Univ Petr & Minerals, Res Inst, Dhahran 31261, Saudi Arabia
[2] King Fahd Univ Petr & Minerals, Dept Civil Engn, Dhahran 31261, Saudi Arabia
[3] Ind Contractors Co Ltd, INCO Precast Engn, Khobar, Saudi Arabia
来源
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING | 2012年 / 37卷 / 02期
关键词
Hollow-core slab; Flexural strength; Shear strength; Shear span to depth ratio; Full-scale load tests; Flexure-shear; Web-shear; Prestressed concrete;
D O I
10.1007/s13369-012-0175-8
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Prestressed, precast hollow-core slabs are used extensively for floor and roofing systems in precast concrete construction in Saudi Arabia. Design of these precast structural units is based on ultimate load-carrying capacity of these members. Full-scale load tests were conducted on prestressed precast hollow-core slabs with different shear span to depth (a/d) ratio, which were loaded to failure to ascertain the ultimate load-carrying capacity of these slabs. A total of 15 slab specimens, 5 and 2.5 m in span and having three different depths, 200, 250 and 300 mm were tested to failure using four-point load test. It was interesting to note that the failure mode of hollow-core slabs changed from pure flexure mode to flexure-shear mode for slabs with depth greater than 200 mm. The web shear cracking strength of PPHC slabs decreased with an increase in depth of the slab. A transition from flexure-shear to web shear failure as a function of a/d was noted in the load tests. The analysis of the experimental results showed that the existing ACI code equations underestimated the flexure-shear strength of these hollow-core slabs. Based on regression analysis of experimental data, a modification is proposed in the existing ACI code equation which can capture accurately the mode of failure and ultimate load-carrying capacity of these slabs.
引用
收藏
页码:443 / 455
页数:13
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