Tạp chí Khoa học Công nghệ Xây dựng số 2/2013
Ngày tạo : 14/07/2015
Tạp chí Khoa học Công nghệ Xây dựng số 2/2013
TS. Vũ Thành Trung, KS. Nguyễn Quỳnh Hoa
Đánh giá profile vận tốc gió
theo các tiêu chuẩn của một số nước, download
TS. Cao Duy Khôi
Nghiên cứu quá trình phá hủy dây chuyền của khung nhiều tầng bê tông cốt thép liền khối bằng phương pháp phân tích động phi tuyến, download
Ths. Nguyễn Huy Long
Phân tích kết quả thí nghiệm thấm theo phương pháp cột nước không đổi tại hiện trường, download
Ths. Nguyễn Công Thắng, TS. Nguyễn Văn Tuấn, PGS.TS Phạm Hữu Hanh, Ths. Nguyễn Trọng lâm
Nghiên cứu chế tạo bê tông chất lượng siêu cao sử dụng hỗn hợp phụ gia khoáng silica fume và tro bay sẵn có ở Việt Nam, download
TS. Phạm Toàn Đức
Nghiên cứu ảnh hưởng của tro tuyển nhiệt điện Hải Phòng tới cường độ, độ chống thấm của bê tông trong điều kiện khí hậu nóng ẩm Việt Nam, download
TS. Nguyễn Quang Minh; Ths. Nguyễn Đăng Hiếu
Xác định độ thẳng đứng của công trình nhà cao tầng bằng công nghệ GPS có tính đến ảnh hưởng của sự rung lắc công trình, download
Ths. Nguyễn Xuân Hòa; Ths. Lê Văn Hùng
Xây
dựng công thức nội suy dị thường độ cao trong hệ tọa độ vuông góc không gian
địa diện chân trời địa phương, download
Abstract
Wind speed profiles: comparative study of
different wind codes (pp.3-11)
Dr. Vu Thanh Trung, Eng.
Nguyen Quynh Hoa
For wind study, a precise knowledge of
the characteristics of the approaching wind is necessary. The approaching wind
characteristics are largely controlled by the roughness of the upwind fetch
over which it had blown. The way that wind speed profiles of the approaching
wind is being taken care of by different wind codes can be very different. This
paper presents a comparative study about wind profiles according to different
wind codes and a set of wind profile (10 minute mean and 3 second gust) is
proposed for Vietnam
wind code.
Progressive collapse of multi-storey
monolithic RC frames in dynamic nonlinear analysis (pp.12-17)
Dr. Cao Duy Khoi
Under specific impacts as progressive
collapse, dynamic effect has the significant influence. However, such influence
has not been studied thoroughly. The researching object of this article is the
“cast-in-situ reinforced multi-storey frames subjected to sudden loss of column
in the 1st floor”. For dynamic effect evaluation, dynamic load
factor (Kdv) is calculated by nonlinear dynamic analyses for frames
with different numbers of floors.
Analyzing
results from field constant head permeability tests (pp.18-23)
MEng. Nguyen Huy Long
Permeability coefficient can be
determined by different testing methods such us laboratory or field tests. In the field permeability
tests, the natural soil conditions such as density, undisturbance,
saturation of the soil, etc., are almost unchanged that gives the test results
more appropriate to
the actual condition. This paper presents the actual field constant head
permeability tests and their analyzed results.
Ultra high performance concrete using the
combination of silica fume and fly ash available in Vietnam (pp.24-31)
MEng. Nguyen
Cong Thang, Dr. Nguyen Van Tuan, Prof. Dr. Pham Huu Hanh, MEng. Nguyen Trong
Lam
Ultra-high performance concrete (UHPC) is
one of the promising concretes with a very high fluidity, a ultra high
strength, a very low permeability, and an excellent durability. However, the
high content of cement in this concrete, normally from 900 to 1000 kg/m3,
can produce negative effect on both the cost and the properties of the
products. Therefore, the use of mineral admixtures to replace cement in
producing UHPC is a good solution in terms of technical, economic and
environmental problems, and this will contribute to sustainable construction development.
This paper presents the preliminary
results of using a combination of silica fume and fly ash available in Vietnam to
produce UHPC. The results show that this combination improves both the
workability and compressive strength of UHPC, which is very important for
development and potential applications of this concrete in construction
industry in Vietnam.
The study influence of Haiphong
thermal power plants ash on compressive
strength and waterpermeability of concrete in Vietnam
humid climatic conditions (pp.32-35)
Dr. Pham Toan Duc
In 2009 Haiphong 1 thermal power plant with
a capacity of 600 MW was officially put into operation but there has been no recruitment
workshops for separating ash from coal ash mixture for reuse.
Quality recruitment ash in a thermal power plant concrete depends on many factors
such as the technological chain of
power plants, technological lines
become separated shop's
products, the quality and origin of coal used for thermal power
plants. Therefore, more research needs to
evaluate a comprehensive recruitment
ash quality and
efficiency of nowhere to bring
it before the line
separating investment into the ash. Within the scope of the article, the authors introduce the
results of his
research while using ash recruitment Haiphong thermal power plant in concrete.
Determination of verticality of
high-rise building using GPS with consideration of the building displacements
(pp.36-41)
Dr. Nguyen Quang Minh, MEng. Nguyen Dang Hieu
This
paper mentions to some issues in determination of the verticality of high-rise
building using GPS. In determining the verticality of the high-rise building,
the effect of oscillations and displacement to the GPS observation during the
measurement is a very important factor which is not yet concerned so far in Vietnam. This
issue is discussed and examined in this paper for the high-rise building
project of Lotte Tower
in Hanoi and
from that a conclusion on the necessity of using GPS to determine the
coordinates for the very top floors of the high-rise building is presented.
Establishment of interpolation formula for the elevation anomalous in the
local topocentric coordinate system (pp.42-45)
MEng. Nguyen Xuan Hoa, MEng. Le Van Hung
When establishing the topocentric coordinate
system for a building, beside the measurement of national coordinates (VN-2000)
to the datum point of control network, it is necessary to transfer the
elevation to some points GPS by differential
leveling in order to determine the anomalous elevation serving as a
basis for establishment of interpolation formula. For a region with average
area and relatively flat terrain, a bilinear function can be used for
interpolating anomalous elevation based on common points.
