Advanced Theory of Concrete Structures Chapter 3 Bond and Anchorage Yong Zhou College of Civil Engineering,Tongji University 土亦工程学院 yongzhou@tongji.edu.cn COLLEGEOPCVILINGAINETRING
Yong Zhou College of Civil Engineering, Tongji University yongzhou@tongji.edu.cn Chapter 3 Bond and Anchorage Advanced Theory of Concrete Structures
3.1 Introduction Why should we research bond and anchorage? External loads一Concrete-？→Reinforcement Prerequisite of composite structure Detailing requirement 土水工程学院
2 3.1 Introduction ◼ Why should we research bond and anchorage? External loads Concrete ? Reinforcement Prerequisite of composite structure Detailing requirement C T V P
3.1 Introduction N d.tdk=do、·πd2/4 Ha (6) N T= d dos A dx ,+dc. True bond stress (c) o,+do, In-and-out stress (d) Bond stress will not exist unless the steel (e) Os +do 圭 stresses change between any two sections 土本工程学院 3
3 3 3.1 Introduction dx d d s 4 = / 4 2 d dx d d = s True bond stress In-and-out stress Bond stress will not exist unless the steel stresses change between any two sections
3.1 Introduction T= M Y h T2= M2 M+AM rh rh M △M △T= M=M+AM M rh △r AT V T= T=T+AT T △x4s rhus Average bond stress 土本工程学院
4 4 3.1 Introduction P P M T2=T1+T T1 x M2=M1+M M1 h M T s 1 1 = 2 1 2 s s M M M T h h + = = h M T s = s s s T V x h = = Average bond stress
3.1 Introduction (a)before cracking after cracking (a) 2 1 21 12 (b) (b) (c) (d) T 2 M M+dM M+dM Anchoring os+dos os+dos Local bond: bond:ensure the dx improve energy concerted action dissipation of concrete and 目土本工程幸院 capacity of reinforcement concrete
5 3.1 Introduction before cracking after cracking Local bond: improve energy dissipation capacity of concrete Anchoring bond: ensure the concerted action of concrete and reinforcement