Journal of Civil Engineering and Management
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EFFICIENCY OF PUMP OPERATION IN HYDRONIC HEATING AND COOLING SYSTEMS
Journal of Civil Engineering and Management - Tập 12 Số 1 - Trang 57-62 - 2006
Developments in pump technology provide new possibilities of improving both the
efficiency and the quality of control of hydronic heating and cooling systems.
Improved pump efficiency and direct flow control can substantially reduce the
drive power to circulation pumps. Measurements show that a simple VSD (variable
speed drive) does not unduly degrade the efficiency of commonly used pumps. An
exam...
PREDICTION OF GOVERNMENT-OWNED BUILDING ENERGY CONSUMPTION BASED ON AN RRELIEFF AND SUPPORT VECTOR MACHINE MODEL
Journal of Civil Engineering and Management - Tập 21 Số 6 - Trang 748-760
Accurate prediction of the energy consumption of government-owned buildings in
the design phase is vital for government agencies, as it enables formulation of
the early phases of development of such buildings with a view to reducing their
environmental impact. The aim of this study was to identify the variables that
are associated with energy consumption in government-owned buildings and to
propos...
SETTING TIMES OF PORTLAND CEMENT–METAKAOLIN–FLY ASH BLENDS / PORTLANDCEMENČIO, METAKAOLINO IR LAKIŲJŲ PELENŲ MIŠINIŲ RIŠIMOSI TERMINAI
Journal of Civil Engineering and Management - Tập 17 Số 1 - Trang 55-62 - 2011
In the present study two pozzolanic materials are used, Metakaolin (MK) and Fly
Ash (PFA), as binary and ternary partial replacement binders with Portland
cement (PC) to investigate their effect on standard consistence and setting
times of paste. To maintain standard consistency for MK–PC pastes increasing w/b
ratios are required with increasing MK levels, whereas PFA has little influence
on consi...
MECHANICAL BEHAVIOUR OF TIMBER‐TO‐CONCRETE CONNECTIONS WITH INCLINED SCREWS
Journal of Civil Engineering and Management - Tập 13 Số 3 - Trang 201-207 - 2007
The purpose of this paper is to adopt the Johansen's yielding theory as a
possibility to predict the ultimate load for timber‐to‐concrete joints using
self‐tapping threaded connectors screwed at an angle into the wood. The ultimate
load‐bearing capacity of a single connector is predicted to be when either the
stresses in the wood reach the plastic failure stress level or when a
combination of plas...
CUSTOMER BEHAVIOR AND DECISION MAKING IN THE REFURBISHMENT INDUSTRY‐A DATA MINING APPROACH
Journal of Civil Engineering and Management - Tập 16 Số 1 - Trang 75-84 - 2010
The study of consumer behavior in the refurbishment industry is crucial to the
business operation of firms, but there is a lack of research in this regard.
With reference to the EKB model specific to consumer behavior, this paper
discusses the relationship among consumption characteristics, firm selection
behavior and satisfaction degree of refurbishment customers. 242 valid
questionnaire copies w...
VERTICAL CAPACITY OF BUCKET FOUNDATIONS IN UNDRAINED SOIL
Journal of Civil Engineering and Management - Tập 20 Số 3 - Trang 360-371 - 2014
Offshore wind turbine structures are traditionally founded on gravity concrete
foundations or mono-piles. Bucket foundations were developed for the offshore
oil and gas industry and are now being used in wind turbine construction. The
loading in this application is characterized by a vertical load due to the
slender construction combined with horizontal forces inducing a large
overturning moment. ...
DAMAGE DIAGNOSIS IN BEAM-LIKE STRUCTURES BY ARTIFICIAL NEURAL NETWORKS
Journal of Civil Engineering and Management - Tập 21 Số 5 - Trang 591-604
Applicability of artificial neural networks is examined in determining the
natural frequencies of intact beams and crack parameters of damaged beams.
Multi-layer perceptron (MLP) and radial basis neural networks (RBNN) are
utilized for training and validation of input data. In the first part of the
study, the first four frequencies of free vibration are predicted based on beam
properties by the ne...
EVALUATING FATIGUE BEHAVIOR OF ASPHALT BINDERS AND MIXES CONTAINING DATE SEED ASH
Journal of Civil Engineering and Management - Tập 23 Số 8 - Trang 1164-1175
Fatigue is one of the most occurring distresses in asphalt pavements. Asphalt
binder plays a critical role in fatigue behavior of asphalt mixes. Modelling
and predicting fatigue behavior of binders will result in more fatigue resistant
mixes. In this research, possibility of using Date Seed Ash alongside two
commonly used additives (namely, a siliceous and a limestone) as bitumen
modifier were in...
ANALYSIS OF STOCHASTIC PROCESS TO MODEL SAFETY RISK IN CONSTRUCTION INDUSTRY
Journal of Civil Engineering and Management - Tập 27 Số 2 - Trang 87-99 - 2021
There are many factors leading to construction safety accident. The rule
presented under the influence of these factors should be a statistical random
rule. To reveal those random rules and study the probability prediction method
of construction safety accident, according to stochastic process theory, general
stochastic process, Markov process and normal process are respectively used to
simulate t...
MULTI-PERSON SELECTION OF THE BEST WIND TURBINE BASED ON THE MULTI-CRITERIA INTEGRATED ADDITIVE-MULTIPLICATIVE UTILITY FUNCTION
Journal of Civil Engineering and Management - Tập 20 Số 4 - Trang 590-599 - 2014
Energy generation and savings is a vital problem for the social and economic
development of a modern world. The construction of wind farms is a challenge of
crucial importance to Lithuania. Offshore wind farms are one of the
possibilities of the multiple use of marine space. Wind energy industry has
become the fastest growing renewable energy in the world. An offshore wind farm
is considered one o...
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