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DOI£º10.11918/j.issn.0367-6234.2015.02.001

·ÖÀàºÅ:TU378.1

»ù½ðÏîÄ¿:¹ú¼Ò×ÔÈ»¿Æѧ»ù½ð(51378146);¹ú¼Ò½ÌÓý²¿****½±Àø¼Æ»®(2009-37);½ÌÓý²¿²©Ê¿µã»ù½ð(20132302110064).



Internal force redistribution of unbonded prestressed concrete edge supported slabs

WANG Xiaodong^1,2,ZHENG Wenzhong¹,WANG Ying¹

(1. Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology), Ministry of Education, 150090 Harbin, China; 2.School of Civil Engineering,Harbin University of Science and Technology,150001 Harbin,China)

Abstract:

Design method of stress increment in unbonded tendons and moment redistribution in codes as GB50010¡¢JGJ92 and ACI318 were mainly applied to linear members. The investigation of stress increment in unbonded tendons and the inner force redistribution of prestressed concrete edge-supported two-way slabs is few. Therefore, the finite element was modeled by ABAQUS soft-ware for unbonded prestressed concrete edge-supported two-way slabs, and the stress increment in unbonded tendons and moment redistribution of prestressed concrete edge-supported two-way slabs were studied, which were influenced by the grade of non-prestressing reinforcement and combined reinforcement index in critical section of support. It is shown that at serviceability state the stress increment in tendons increases with the higher combined reinforcement index and higher yield strength of non-prestressing reinforcements. At ultimate limit state the stress increment in tendons increases with the lower combined reinforcement index and higher yield strength of non-prestressing reinforcements. The moment redistribution coefficient reduces with the higher combined reinforcement index and higher yield strength of non-prestressing reinforcements. Calculation formulas of stress increment in tendons and moment redistribution coefficient in critical section of support are proposed, which provides basis for design of unbonded prestressed concrete edge-supported two-way slabs.

Key words:  prestressed concrete  edge-supported two-way slab  finite element  stress increment in tendon  moment redistribution coefficient