Temporary Works Toolkit. Part 19: An introduction to the demolition of large stuctures

Many modern office towers are of steel-composite constructione. However, the lightweight nature of steel means a lower modal mass – and vibrations from active sources (e.g. footfall) need be considered carefully during the design stage. This article discusses vibration performance and mitigation based on recent experience in Singapore.

A structure in its permanent state cannot be ‘wished into place’. Appropriate consideration must be given to construction methodology so that permanent works can be optimised, temporary works minimised and trade interfaces simplified. This article presents a list of general, high-level considerations that relate to construction methodology and optimisation of temporary/permanent works, with a number of examples provided.

Current highway bridge designs in the UK tend to favour either composite steel girders with a precast or in situ concrete deck for long spans, or precast concrete beams with an in situ concrete deck for spans of less than 40m. This article considers temporary works, in particular the use of temporary supports, to precast concrete bridge beams during deck construction.