Prestressed Concrete Design, Second Edition

by Hurst,M.K.

• ISBN13: 9780419218005
• ISBN10: 0419218009
• Edition: 2nd
• Format: Hardcover
• Copyright: 1998-05-14
• Publisher: CRC Press

Summary

This edition provides up-to-date guidance on the detailed design of prestressed concrete structures. All major topics are dealt with, including prestressed flat slabs, an important and growing application in the design of buildings.

Table of Contents

Preface	xi
Symbols	xii
Basic principles	1	(28)
Introduction	1	(5)
Methods of prestressing	6	(3)
Structural behaviour	9	(3)
Internal equilibrium	12	(4)
Deflected tendons	16	(2)
Integral behaviour	18	(1)
Forces exerted by tendons	19	(4)
Loss of prestress force	23	(1)
Degrees of prestressing	24	(1)
Safety	25	(4)
Problems	25	(4)
Properties of materials	29	(13)
Strength of concrete	29	(1)
Modulus of elasticity of concrete	30	(2)
Creep of concrete	32	(1)
Shrinkage of concrete	32	(2)
Lightweight concrete	34	(1)
Steel for prestressing	34	(2)
Relaxation of steel	36	(1)
Stress-strain curves for steel	37	(3)
Corrosion of steel	40	(2)
Limit state design	42	(15)
Introduction	42	(1)
Limit states	42	(2)
Characteristic loads and strengths	44	(2)
Partial factors of safety	46	(2)
Stress--strain curves	48	(1)
Loading cases	49	(2)
Allowable stresses	51	(1)
Fire resistance	51	(2)
Fatigue	53	(1)
Durability	54	(1)
Vibration	55	(2)
Loss of prestress force	57	(22)
Introduction	57	(1)
Elastic shortening	58	(3)
Friction	61	(6)
Anchorage draw-in	67	(1)
Variation of initial prestress force along a member	67	(3)
Long-term losses	70	(3)
Total prestress losses	73	(1)
Measurement of prestress force	73	(3)
Initial overtensioning	76	(3)
Problems	76	(3)
Analysis of sections	79	(28)
Introduction	79	(1)
Serviceability limit state	80	(3)
Additional steel stress due to bending	83	(1)
Post-cracking behaviour	84	(2)
Ultimate load behaviour	86	(4)
Variation of steel stress	90	(1)
Design ultimate strength	91	(3)
Simplified concrete stress block	94	(1)
Design charts	94	(2)
Untensioned reinforcement	96	(1)
Cracked members	97	(3)
Members with unbonded tendons	100	(7)
Problems	103	(4)
Deflections	107	(13)
Limits to deflection	107	(1)
Short-term deflections of uncracked members	108	(4)
Long-term deflections	112	(1)
Deflections of cracked members	113	(4)
Load balancing	117	(1)
Load--deflection curves	118	(2)
Problems	119	(1)
Shear	120	(6)
Introduction	120	(1)
Design shear resistance	120	(6)
Prestressing systems and anchorages	126	(16)
Pretensioning systems	126	(1)
Post-tensioning systems	127	(6)
Bursting forces in anchorage zones	133	(5)
Transmission lengths in pretensioned members	138	(4)
Design of members	142	(28)
Introduction	142	(1)
Basic inequalities	142	(4)
Design of prestress force	146	(3)
Magnel diagram	149	(2)
Cable zone	151	(3)
Minimum prestress force	154	(2)
Ultimate strength design	156	(1)
Cracked members	157	(4)
Choice of section	161	(1)
Flow charts for design	162	(1)
Detailing	163	(7)
Problems	166	(4)
Composite construction	170	(21)
Introduction	170	(1)
Serviceability limit state	170	(4)
Ultimate strength	174	(2)
Horizontal shear	176	(3)
Vertical shear	179	(1)
Deflections	180	(2)
Differential movements	182	(4)
Propping and continuity	186	(2)
Design of composite members	188	(3)
Problems	189	(2)
Indeterminate structures	191	(20)
Introduction	191	(1)
Secondary moments	191	(9)
Linear transformation and concordancy	200	(4)
Ultimate load behaviour	204	(7)
Problems	208	(3)
Prestressed flat slabs	211	(23)
Introduction	211	(1)
Two-way load balancing	211	(3)
Equivalent-frame analysis	214	(3)
Design and detailing	217	(8)
Ultimate strength	225	(2)
Shear resistance	227	(7)
Design examples	234	(18)
Introduction	234	(18)
Example 13.1	235	(8)
Example 13.2	243	(9)
Solutions to problems	252	(2)
Bibliography	254	(2)
Index	256