038021am a2200421 4500 20260817171220.0 070998 th eng .b11722897 AIT Thesis no. ST-98-22 Torsak Lertsrisakulrat Behavior of precast-prestressed floor planks under concentrated loads Bangkok : Asian Institute of Technology, 1998 49, A3, B98, C24 leaves Thesis : no. ST-98-22 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Civil Engineering Thesis (M.Eng.) - Asian Institute of Technology, 1998 In this study, an experimental investigation on the responses of composite precast prestressed floor planks with cast-in-situ concrete topping to applied concentrated line load at midspan was carried out. Three types of solid precast-prestressed floor plank having cross section of 350x50 mm. were tested on simple span while the thicknesses of concrete topping adopted were 40-60 mm. The purpose of the study is to investigate in details the structural behavior of composite floor planks under different loading conditions. The effects of thicknesses of concrete topping on the structural performance were also investigated. Test results show that when composite floor planks were subjected to concentrated line load, the first cracking loads and flexural stiffnesses were significantly reduced as compared with those subjected to uniformly distributed load. The enlargement of concrete topping thickness resulted in a remarkable improvement of load-carrying capacity of composite floor planks regardless of type of loading applied to the planks. In other words, the first cracking load, flexural stiffness and ultimate load were considerably increased with the increase in thickness of concrete topping. Considering structural safety of composite floor planks, it was also observed that the safety factors were reduced sharply when composite floor planks were subjected to concentrated line load as compared to those subjected to uniformly distributed load. Failure of specimen was observed to be the same as that of underreinforced concrete members. The remarkable ductile behavior could be observed. The propagation of cracks was observed to be similar for both types of loadings except that the composite floor planks subjected to concentrated line load possessed narrower crack propagation zone and closer crack spacings. Prestressed concrete construction Floors, Concrete Pichai Nimityongskul, Chairperson Pennung Warnitchai, Examination Committee Gupta, Satyendra P., Examination committee Government of Germany (DAAD), Scholarship donor Asian Institute of Technology. Thesis ; no. ST-98-22 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B13174 .b11722897 mnait y 240405 0 980907 m a y 0 mnait mnait mnarc 20 40 Barcode : 30050120660369 CREATED : 1997-10-04 RECORD # : i12092575 LPATRON : 1014036 LCHKIN : 2001-07-15 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 3 TOT RENEW : 0 Barcode : 30050120660377 CREATED : 1997-10-04 RECORD # : i12092587 LPATRON : 1011317 LCHKIN : 2000-05-13 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 6 TOT RENEW : 1 Barcode : 30050160006879 CREATED : 2016-03-22 RECORD # : i12901945 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 11371 11371 0 0 0 0 MAIN MAIN mnait 2026-08-17 0 AIT Thesis no. ST-98-22 30050120660369 2026-08-17 17:12:20 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 0 AIT Thesis no. ST-98-22 30050120660377 2026-08-17 17:12:20 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no. ST-98-22 30050160006879 2026-08-17 17:12:20 1 2026-08-17 40