Tạp chí KHCN Xây dựng số 4/2009
Ngày tạo : 15/07/2015
Tạp chí KHCN Xây dựng số 4/2009
ThS. Vũ Thành Trung, GS. Yukio Tamura, PGS.
Akihito Yoshida
Nghiên
cứu xác định tải trọng gió lên các tấm che nắng có độ rỗng khác nhau bằng ổng
thổi khí động,
ThS.
Phan Văn Quảng, TS. Otani Shunsuke, PGS.TS. Ohami Hoichi
Khảo sát sự tắt dần động trong phân tích
đáp ứng phi tuyến bằng mô hình hệ số tắt dần tỷ lệ với độ cứng tức thời,
ThS. Lê
Trung Phong
Về các
tính năng cơ lý của vật liệu dùng cho kết cấu bê tông cốt thép trong một số
tiêu chuẩn hiện hành,
PGS.TS. Trần Đức Hạ
Các
giải pháp tổng hợp cải thiện môi trường nước hồ đô thị,
PGS.TS. Bùi Sỹ Lý, KS.
Bùi Thị Hiếu
Nghiên
cứu giải pháp thông gió làm mát đoạn nhiệt áp suất dương để chống nóng và cải
thiện môi trường lao động,
KS. Tạ Xuân Hoà, KS.
Nguyễn Tuấn Anh
Một số
giải pháp tiết kiệm năng lượng cho hệ thống thông gió và điều hoà không khí
trong công trình xây dựng tại Việt Nam,
ThS. Đoàn Văn Động
Nghiên
cứu đề xuất dây chuyền công nghệ xử lý nước thải bệnh viện huyện Mường La – Sơn
La,
ThS.
Khương Văn Huân
Đánh
giá cường độ bê tông trên các công trình thuỷ lợi khu vực đồng bằng
sông Cửu Long,
KS. Tống Thị Hạnh,
PGS.TS.Trương Quang Hiếu
Đề
xuất giải pháp đánh giá độ ổn định mốc chuẩn dựa vào kết quả bình sai dãy chênh
cao đo nhiều chu kỳ,
KS. Trần Ngọc Đông
Khảo
sát phương pháp đo kiểm tra lưới trục thi công nhà cao tầng bằng công nghệ GPS,
ABSTRACTS
Studying to determine wind loading on
porous sunshade roof cover sheets with differential porosities using wind
tunnel (pp. 3- 8)
MEng. Vu thanh trung, Prof. Yukio
tamura, A/Prof. Akihito
Yoshida
Porous sunshade roof cover
sheets are used to reduce temperatures inside buildings. This paper describes a
parametric wind tunnel study carried out to investigate the influence of
porosity on wind loadings. The mean, fluctuating (rms), maximum peak and
minimum peak wind pressure distributions over the surfaces of a porous sunshade
roof cover sheet were measured for porosities of 0%, 5% and 10% (ratio of area
of orifices to area of porous sunshade roof cover sheet). The results show that
the porous sunshade roof cover sheet with no porosity (0%) had the highest wind
loading, and that those with porosities of 5% and 10% were most effective in
reducing wind loading.
Discussion on tangent
stiffness-proportional damping in nonlinear response analysis (pp. 9-12)
MEng. Phan van quang, Dr. OTANI Shunsuke, A/Prof.Dr. OHAMI Koichi
This research is presented
for two calculating methods of tangent stiffness-proportional damping in
nonlinear response analysis. In continuous damping force model, the damping
force is considered proportional to the instant velocity. In discontinuous
damping force model, the increment of damping force is considered proportional
to the increment of instant velocity. The properties and the damping efficiency
of the two models is analyzed and compared with each others.
About the physical-mechanical
properties of materials used for reinforced concrete structures specified in
some current standards (pp. 13-22)
MEng. LE Trung Phong
The Vietnam
standard TCXDVN 375:2006 is mainly established based on the Eurocode 8
regarding to seismic loads and actions. To apply this standard, all the
materials and structures used shall comply with EN 1992-1-1:2004. In this
paper, the author describes the regulations specified in EN 1992-1-1:2004 and
TCXDVN 356:2005 and then proposes necessary recommendations for designing
structures under seismic loads according to TCXDVN 356:2005. In addition, the
author also present a study on the available steel types and their
manufacturers as well as applicable levels of the relevant standards.
Integrated technical solution
for improving the quality of water environment of urban lakes (pp. 23-28)
A/Prof.Dr. Tran Duc Ha
On the basis of a study on
the origination, function and characteristic of urban lakes located in
different ecological regions, the Ministry of Construction-level research theme
(code: RDMT 15-06) assessed the impacts of urbanization on water environment of
urban lakes. This paper presents a integrated technical measure for improving
lake water quality and for conserving the urban landscape, such as: artificial
oxygen supply, wastewater dilution, aquatic macrophyte cultivation. The
integrated solution composing technical and management measures is proposed.
Research on positive pressure
adiabatic vaporization ventilation for heat resistant and labour environmental
improvement (pp. 29-31)
A/Prof.Dr. Bui Sy Ly, Eng. Bui Thi
Hieu
Labour
environment of most industrial zones and enterprises are facing with various
pollution levels. According to monitoring results, 66% of enterprises are
polluted by heating. But most of them neither have any heat resistant
ventilation system nor have improper ventilation system so their workers always
work in high temperature and humidity environment. During summer, temperature
of some areas of the workshops is higher than outside from 5 to 80C. Working
with high labour intensity, long time period in severe working condition have
been impacted seriously to worker health and reducing their labour
productivity. Hence, the research aims to recommend the new ventilation system,
which is low capita investment and operational and maintenance costs and
suitable with mentioned practical situation.
Some energy saving solutions for
the ventilation and air-conditioning systems in building structures in Vietnam
(pp. 32-36)
Eng. ta xuan hoa, Eng.
nguyen tuan anh
According
to an investigation on energy consumptions in buildings, the electrical energy
consumed by the ventilation and air-conditioning systems is about 70%-90% the
total consumed energy. Therefore, energy saving for the ventilation and
air-conditioning systems is the most important question.
In this paper, the authors
present some energy saving solutions for the ventilation and air-conditioning
systems in building structures, including: energy saving solution in the stage of architectural
design, in the stage of design of ventilation and air-conditioning systems,
during the construction stage and during the operation and exploitation
process.
Studying to propose the
technological line for treating the waste water discharged by the Muong La
district hospital – Son La province (pp. 37- 41)
MEng. Doan Van Dong
The Muong La district
hospital – Son La province has some 100 sick-beds. Due to the lack of treating,
the waste water discharged from the hospital contains much organic substances,
sediments, pathogenic microbe.. that have been and are making the surrounding
environment polluted.
In this paper, the author presents a study for selecting the technological line
for treating the waste water discharged by the Muong La hospital, the design,
construction of the line and transfer of the treating technology that uses
biological filters with a capacity of 60m3 per day.
Assessment of concrete strength
change in hydraulic structures located in the Mekong
river delta (pp. 42-47)
MEng. Khuong Van
Huan
The Mekong river
delta with area is about 390.000 square kilometer. Sixty percent (60%) of
this area affected by sulfate acidity and salinity intrusion. Hydraulic
reinforced concrete structures, constructed in these areas have signs of high
corrosion. Based on studying results, it is shown that the strength of concrete
is decreased higher in acid environment than those in salty environment. After
30 years, concrete in acid environment will be unable to use due to the
degradation of concrete.
In this paper, the author presents an assessment of concrete compressive
strength change in hydraulic structures in order to determine the remaining
compressive strength and propose recommendations on technical solutions for
ensuring the corrosion resistance of concrete structures in the said area.
Proposal of a solution for
assessing the stability of benchmarks in the basic network based on the
adjustment result of periods (pp. 48-50)
Eng.Tong Thi
Hanh, A/Prof.Dr. Truong
Quang Hieu
In this paper, the authors
propose one way to assess the stability subsidence benchmark measured by
periods based on statistical hypothesis testing with distribution D– Simon.
Investigation of measuring
methods for checking the geodetic network for construction of high-rise
buildings with GPS technology (pp. 51-54)
Eng. Tran Ngoc Dong
High-rise buildings have
been are being increasingly built in big cities such as Hanoi, HCMC and many
other city in Vietnam as a indispensable tendency. In the surveying work for
construction of high-rise buildings, to ensure the verticality of the building
is a matter of great importance in order not to influence on the bearing
capacity of the building.
In this paper, the author presents an investigation on measuring methods for
checking the geodetic network for construction of high-rise buildings
established by the Contractor with GPS technology in terms of the geodetic
network reliability.
