Highway Bridge

364379750616967106

Introduction

During the entire life cycle of highway bridge design, construction, operation and demolition, it will not only consume a lot of resources and cause a lot of pollutant discharge, but also cause expensive economic losses. In order to meet the sustainable development requirements of bridge engineering construction, it is of great significance to carry out comprehensive quantitative analysis of the environmental impact of the whole life cycle of highway bridges.

In the analysis of Assignment 2, when comparing piers formed of the following 5 different materials,

5cf8df176a118bc488d1303b3660c04

 

478b1c9b02bda3ab07bf0c74f653dad

f64b351d9157aba3765e3c18651bedf

it was determined that the option with the least emissions during its  lifetime is Option  1. The most important parts of the LCA are shown below.

Goal & scope of the LCA

According to the life cycle assessment framework provided by the International Standards Organization (ISO), combined with the characteristics of bridges as a special building structure, the stage scope of LCA of bridge piers in highway bridges is determined to include the processing and production of raw materials, construction, operation and maintenance, and disposal and demolition four stages. Since there is not a large amount of resource energy input and pollutant output in the preliminary engineering design stage, this paper does not consider the impact of the bridge pier on the environment in the design stage. The boundary of the bridge life cycle system intuitively reflects the evaluation content and scope of each life stage, as shown in
Figure .
%e5%9b%be%e7%89%87

Figure 1  :Life Cycle System Boundary for Bridge Piers

 Life Cycle Inventory of piers

When the required material quantity and pavement structure type are determined, the pavement energy consumption can be evaluated through the life cycle inventory.

For the piers in the highway bridge, the research object of this paper, the main construction materials considered include different kinds of steel, stone, cement, fly ash, aggregate, etc.

The parameters that would be required to calculate the material quantities of the pier are the following:

d4425b7d6c5f438a0bc87597f182b68

Figure 2:required building materials

Life Cycle Cost Analysis

Bridge piers consume natural resources and energy in various forms such as construction materials and equipment during their life cycle. In the construction process, there are many problems such as huge resource consumption in the raw material preparation stage, serious pollution in the construction stage, frequent maintenance during use, and short service life. Environmental costs mainly refer to environmental burdens, such as the consumption of non-renewable raw materials and energy, and the discharge of pollutants into the atmosphere, soil and water, including CO2, SO2, NOx, dust and solid waste, noise and loss of biodiversity Wait.

This paper will analyze the Energy, CO2, NOx and SO2 produced in the whole life cycle of the pier.

93c2035c53c5fa4f16c043a86eef68a

579260fa6c05e8ce70ad0e95632847a

Figure 3:Life Cycle Inventory Results for Pier Materials

Result Analysis – AHP

In this system, the AHP method will be used to divide the various factors in the complex problem into interconnected and orderly levels to make them organized, and to compare the elements of the first level for quantitative description.

 %e5%9b%be%e7%89%87

 For a deeper understanding of projects, follow the different civil engineering systems in an integrated context; Dam and Pavement. All these products are included in the overall integrated maintenance plan and are being evaluated to define the impact of integration on integration life cycle analysis through multi-objective optimized integrated maintenance plan.

Quellenverzeichnis

[1]Life Cycle Assessment (LCA)—Definition of Goals and Scope,Silva, Diogo Aparecido Lopes,Cham: Springer International Publishing,Life Cycle Engineering and Management of Products, 2021, p.45-69