Tạp chí Khoa học CNXD - Số 1/2005 (130)
Ngày tạo : 14/07/2015
Tạp chí Khoa học CNXD - Số 1/2005 (130)
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Viện
KHCN Xây dựng và công tác biên soạn các tiêu chuẩn xây dựng
PGS. TS. Cao Duy Tiến
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Phương
pháp xác định quan hệ ứng suất-biến dạng của bê tông chịu nén từ thí nghiệm uốn
và nén uốn mẫu có mặt cắt hình tròn
TS. Nguyễn Ngọc Bá
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Đánh
giá độ tin cậy về ổn định cục bộ của thanh thành mỏng chịu nén
ThS. Đỗ Văn Bình ; PGS.TS. Lê Xuân Huỳnh
·
Giới
thiệu phương pháp phun vữa trong sửa chữa cọc khoan nhồi có chất lượng không
đồng nhất
PGS.TS. Nguyễn Viết Trung ; KS. Nguyễn Thị Tuyết Trinh
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Xác
định tốc độ ăn mòn thép bằng phương pháp điện trở phân cực
KS. Vũ Thế Phương; KS. Trần Nam
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Hệ
thống xử lý hỗn hợp nước thải và khí thải lò hơi cho các cơ sở sản xuất tấm lợp
fibro xi măng ở Việt Nam
ThS. Nguyễn Sơn Lâm ; ThS. Nguyễn Trinh Hương
·
Phổ
phản ứng gia tốc chuẩn kiến nghị dùng trong thiết kế kháng chấn ở Việt Nam
GS.TSKH. Nguyễn Đăng Bích ; TS. Nguyễn Thế Đệ ; GS.TS. Nguyễn Đình
Xuyên ; ThS. Phạm Đình Nguyên
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Biến
đổi kích thước của vật liệu siêu cách nhiệt PU Vietrust thử nghiệm trong môi
trường kiềm
ThS. Mai Thanh Nga ; PGS.TS. Lê Xuân Quế
·
Áp
lực từ trong ra ngoài tác dụng lên công trình xây dựng do ảnh hưởng của lốc
xoáy (vòi rồng)
KS. Nguyễn Ngọc Tình
Vietnam Institute for
Building Science and Technology (IBST) with the task of developing building
standards and codes (pp.3-4)
A/Prof. Dr. Cao Duy Tien
This paper highlights the role of
IBST in the developing of building standards and codes for the purpose of
supporting the Vietnam Ministry of Construction in the State management duty
with respect to the Construction Industry and in the approaching International
standard system for harmonization. During the last year (2004) IBST has
developed 10 of 33 Vietnam
building standards (TCXDVN) issued by Vietnam MOC. Another 10 important Vietnam
building standards and codes scheduled to be developed in 2005 are also stated,
showing the great contribution of IBST to the development of the Vietnam
Construction Industry.
A method for
determining the compressive stress-strain curves of concrete from flexure tests
of specimens having circular cross-sections (pp. 5-9).
Dr. Nguyen Ngoc Ba
This paper presents a new method for
determining the compressive stress-strain curves of concrete from flexure tests
of plain or reinforced concrete specimens having circular cross-sections. This
method is based on the strain compatibility and the force and moment
equilibrium conditions established on the critical cross-section of the test
specimen. This method is applicable to different kinds of tests such as pure
flexure tests, tests of columns under constant end eccentricities, or tests of
columns under constant neutral axis depth.
Reliability assessment
on local buckling of thin-walled members under axial compression (pp.10-16).
MEng. Do Van Binh, A/Prof. Dr. Le Xuan
Huynh
This paper presents a study of
reliability assessment on local buckling of thin-walled members under axial
compression based on the critical stress values calculated by theoretical
methods. Random data of geometrical dimensions of the thin-walled member
sections were taken in both of the critical stress and reliability assessment
calculations. Reliability index (b M) on local buckling of thin-walled members
was derived. Effect coefficient (Kxi) of variation of the random data on the
geometrical dimensions for the safety margin on local buckling of the thin-walled
members was proposed. Numerical examples with the random data of geometrical
dimensions of the thin-walled members available on the constructional steel
market in Vietnam,
were investigated.
Introduction to
remedial methods for non- homogeneous piles using Jet Grouting (pp.17-24)
A/Prof.Dr. Nguyen Viet Trung, Eng.
Nguyen Thi Tuyet Trinh
This paper introduces remedial
methods for non-homogeneous bored piles using Jet Grouting method, especially
Column Jet Grouting with jet grouting machine having the triple pipe. This
method is effective, applied for remedial works at some building constructions
and bridges in Vietnam.
Some results are also presented. Based on the tesing results, the effect of the
method and prospect of applying this method in Vietnam is confimed.
The measurement of
steel corrosion rate by polarization resistance technique (pp. 25-30)
Eng. Vu The Phuong, Eng. Tran Nam.
A simple method is presented to
measurement the corrosion rate of steel rebar in reinforcement concrete and
steel beam in field structure. The method is based on the determination of
polarization resistance of steel. Measurement were done by using potentiostat
Gamry PC4/750 computer controled. The technique investigated furnishes results
with good precisely and more rapidly, and the technique has been proven
feasible for both reinforcement concrete and steel structure.
Combination treatment
system for wastewater and toxic gas discharged at fibro cement roofing tile
factories (pp. 31-34)
MEng. Nguyen Son Lam,
MEng. Nguyen Trinh Huong
This paper introduces the
combination treatment system for wastewater and gas discharged at fibro cement
roofing tile production factories. Neutralization of wastewater with high pH
value by discharge acid gas occurred in coal ash firing in water boiler is
taken place in the absorption tower. After the treatment, wastewater and gas
discharged into environment meet Vietnamese emission standards (TCVN). The
treatment system is economically feasible and can be applied for most roofing
tile production factories in Vietnam.
Standard acceleration
response spectrum recommended to be applied to design of earthquake resistance
in Vietnam (pp. 35-45.)
Prof. DSc. Nguyen Dang Bich, Dr. Nguyen The De, Prof. Dr. Nguyen Dinh Xuyen and MEng. Pham Dinh Nguyen.
The most important question for the
design of earthquake resistance for structures and building constructions in
the seismic areas of Vietnam
is the establishing the Standard acceleration response spectrum. In this paper,
the authors present the way to establish the above response spectrum based on
the Vietnam
seismic data available. The result obtained is reliable, and to some certain
extent it is similar to the Standard acceleration response spectrum in the
American standard UBS-1997.
The change of
geometric parameters of thermal isolating PU Vietrust exposed to alkaline
solution
(pp. 46-48).
MEng. Mai Thanh Nga, A/Prof. Dr. Le Xuan
Que
Porous polyuethane (PU) is a
super-light building material widely used for producing ceiling, cladding,
thermal isolating partitions in civil and industrial structures. However, the
stability and working life of this material has not been studied yet.
This paper presents the expansion
test of a thermal isolating building material, called PU Vietrust, exposed to
alkaline solutions of pH up to 12, which is similar to the environment in
concrete and mortar. It has been found that after 60 days testing at room
temperature without stirring, the maximum expansion of dimension of the sides
is of some 5%, while that of the volume is of some 7%.
Inside-to-Outside
pressure acting on building structures due to tornado (pp. 49-56.)
Eng. Nguyen Ngoc Tinh
When spreading over building
structures, there are 3 force components appeared caused by a tornado. one of
these components is the inside-to-outside pressure on the structure (if the
structure is sealed). This pressure appears because the pressure at the centre
of the tornado is very low and the acting duration of the tornado on the
building is very short while the initial atmotsphere pressure inside the
building is equal to that of the surroundings.
In
this paper, based on the available different equations studied by the oversea
countries on tornados, the author goes on studying the impact of tornado on
building structures and gives an example illustrating the calculation of this
impact.
