Mott MacDonald

About: Mott MacDonald is a company organization based out in London, United Kingdom. It is known for research contribution in the topics: Electric power system & Wind power. The organization has 586 authors who have published 529 publications receiving 9801 citations. The organization is also known as: Mott MacDonald Group & MMD.

Engineering Management of the Tamar Bridge

Abstract: The Tamar Bridge (Fig. 1) was constructed within the period 1959–61 as a private toll crossing for the Tamar Bridge and Torpoint Ferry Joint Committee, comprising representatives of the Cornwall County Council and the Plymouth City Council. Since the end of the maintenance period, the engineers responsible for the design and supervision of construction (Mott, Hay and Anderson) have been retained by the joint committee to undertake an annual inspection of the bridge and its immediate approaches, and to report and make recommendations on any necessary maintenance. Apartfrom small or ad hoc items arranged through the joint engineers, the county surveyor of Cornwall and the City Engineer of Plymouth, subsequent works have invariably been arranged and supervised by those same consultants who, through close liaison with the bridge owners and their staff, have effectively provided a professional service for the long-term management of maintenance activities by forecasting financial commitments and arranging the operations around the increasingly restrictive limitations imposed by traffic densities.

Summarizing the opportunities of engineering geological models and modelling

Abstract: A cikk celja, hogy a melyepitesi mernokgeologiaban, elsősorban az alagutepitesnel hasznalatos numerikus modellezeseket bemutassa, azok előnyeit es hatranyait elemezze es ismertesse a geotechnikai modellalkotas lepeseit es kapcsolatat a mernokgeologiai modellel. A cikk kiter a kőzetmechanikai modellezesben kulcsszerepet jatszo izotropia, homogenitas, illetve kontinuitas kerdesere is. Elsősorban kőzetmechanikai szempontbol elemzi a numerikus modellalkotasok lehetősegeit, de a bemutatott elmeletek ertelemszerűen kiterjeszthetőek a talajmechanikai viszonyokra is.

New Criteria for Assessing the Local Wind Environment at the Pedestrian Level and the Applications

Abstract: The wind environment is a stochastic phenomenon. To deal with this stochastic feature, this chapter introduces the use of exceedance probability analysis to evaluate the properties of the wind. Two representative indices were adopted: the local purging flow rate (LPFR) and the space-averaged kinetic energy of the wind (KE). The former was used to express the ability of airflow to exhaust contaminants generated within a given space, and the latter was used to represent the ability of airflow to cool the human body. The local air change rate (LACR), defined as the local purging flow rate per volume of void space, was used as the ventilation index for application. The exceedance probability (EP) was calculated based on the wind speed distributions described by the Weibull function for 16 azimuths to indicate the exceedance probability of a given air change rate. The exceedance probability of the kinetic energy of the wind in the void space was also evaluated in the same manner as the local air change rate. Acceptable values of the exceedance probability for both the local air change rate and the space-averaged kinetic energy of the wind in the void space were suggested based on acceptable indoor environmental indices.

Simplified stress-strain models applied to data from triaxial and pressuremeter tests on London Clay

Abstract: The Mobilisable Strength Design (MSD) philosophy has been used in various applications related to underground construction, e.g. for analysis of deep foundation and retaining wall performance. MSD requires simple models for the stress-strain behaviour of soils. The use of a mobilisation factor on undrained strength to limit soil mobilisation was introduced in BS8002 in 1994. To assist with MSD calculations, the mobilisation strain framework (MSF) has been developed to allow geotechnical engineers to account for the non-linear behaviour of fine-grained soils in routine geotechnical design. In this paper, triaxial and pressuremeter test data from the London Clay deposit are analysed, using the MSF, to study the effects of anisotropy on both the mobilisation strains and non-linearity exponent. The implications for design of underground constructions are also discussed.