By Robin Whittle
A few classes are just realized from blunders yet, it’s less expensive to profit from anyone else’s errors than to need to achieve this out of your personal. Drawing on over fifty years of operating with concrete buildings, Robin Whittle examines the issues which he has visible take place and exhibits how they can were avoided.
The first and biggest a part of the e-book tells the tales of a couple of circumstances the place issues have long past fallacious with concrete buildings. each one case is analyzed to spot its reason and the way it can were avoided. It then appears at how mess ups in structural modelling can result in great difficulties in the event that they usually are not pointed out prior to development is undertaken. past this it examines how agreement preparations can inspire or hinder difficulties within the designing and construction methods. It concludes with an exam of the function examine and improvement in fighting failures.
By picking out the diversities among shoddy economizations and real potency mark downs, this ebook deals discounts within the brief time period which won’t be on the price of a structure’s long term functionality. necessary analyzing if you’re designing or construction concrete constructions and need to prevent difficulties which may be pricey or embarrassing extra down the road.
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Additional info for Failures in Concrete Structures: Case Studies in Reinforced and Prestressed Concrete
35 Use of strut-and-tie model to transfer load to shear key. 13 PILED RAFT FOR TOWER BLOCK The design of the raft assumed that the walls of the two-level basement car park would act with the raft over the piles to transmit the shear and bending forces to the outer piles. The walls of the basement had almost full height openings, placed one above the other, and contained only nominal reinforcement. 36). The mistake was discovered whilst the tower block was being constructed. 37). The new design relied on the composite action of the new and old rafts.
1 Plan view of trough slab. 2 Section through broad beam. 3 Section through ribbed slab at failure. transferred to the top of the beam. Vertical reinforcement should have been provided for this. Links in the broad beam (in addition to any links necessary for shear resistance) could have provided sufficient resistance. 3). Complete collapse was avoided by immediate temporary propping.
Comment — Although this does not represent a very unsafe situation, it does emphasize the importance of the increased reduction factor for deep sections in EC22 . This example also demonstrates the very different approaches of the two codes of practice to shear resistance and especially shear resistance of prestressed sections. 1 FLAT SLAB AND TWO-WAY SLAB BEHAVIOUR A flat slab is defined as a plate supported on individual columns. A two-way slab is a slab supported by beams at each edge. The UK codes of practice differentiate between flat slabs and two-way slabs.