Tạp chí Khoa học CNXD - Số 4/2005 (133)
Ngày tạo : 15/07/2015
Tạp chí Khoa học CNXD - Số 4/2005 (133)
Cơ sở lý thuyết nghiên cứu đánh giá các quá trình địa cơ và
thuỷ địa cơ phát triển trong hệ thống địa kỹ thuật đê sông đồng bằng Bắc bộ
TSKH. Trần Mạnh Liểu; PGS. TS. Đoàn Thế Tường
Phương pháp ma trận độ cứng động lực và ứng dụng trong tính
toán kết cấu hệ thanh
TS. Trần Văn Liên; ThS. Trần Thuỳ Dương
Sử dụng bê tông tự lèn phòng ngừa rỗ bê tông tại các nút đầu
cột nhà cao tầng
ThS. Trương Thị Hồng Thuý
Phương pháp thí nghiệm gia tốc bằng dòng điện ngoài để đánh
giá khả năng chống ăn mòn và bảo vệ bê tông cốt thép
TS. Phạm Văn Khoan; KS. Vũ Thế Phương và CTV
Công trình tường chắn đất có cốt trên vùng núi chịu chuyển
vị kéo cường bức của nền
TS. Nguyễn Hùng Sơn
Một số vấn đề về ô nhiễm và biện pháp bảo vệ môi trường khu
công nghiệp Minh Khai – Vĩnh Tuy
TS. Bùi Sỹ Lý
Sơ đồ ứng suất hình chữ nhật cho bê tông cường độ cao trong
thiết kế kết cấu bê tông cốt thép
TS. Nguyễn Ngọc Bá
Mô phỏng chi phí để lựa chọn các hệ thống sản xuất linh hoạt
TS. Nguyễn Văn Nghiễm
Một số phương pháp tính biến dạng từ biến của bê tông
PGS. TS. Phan Quang Minh; PGS. TS. Lý Trần Cường; ThS. Hoàng Quang Nhu
ABSTRACT
The theoretical basis of
researching and evaluating of geo-mechanical and hydro-geomechanical processes
developed in the Red river delta dyke geotechnical system (pp. 3-8)
Dr. Sc. Tran Manh Lieu, A/Prof. Dr. Doan The
Tuong
This paper analyses the cause, conditions and
mechanism of the development of geo-mechanical and hydro-geomechanical
processes in the Red river delta dyke geotechnical system, establishes the
corresponding calculation and evaluation model, justifies the boundary and
initial conditions for the said model, which is used as a basis for stable
evaluation of the river dyke geotechnical system.
The method of dynamic
stiffness matrix and its applications in calculating of bar and frame
structures (pp. 9-15)
Dr. Tran Van Lien, MEng. Tran Thuy Duong
This paper presents on how to establish the dynamic
stiffness matrix and nodal force vector for bar and frame structures based on
the given analytical function of the free vibration equation of the bar and
beam elements. In theory, the dynamic stiffness method is more precise and more
generalized than the finite element method. In particular cases, the author has
already found the familiar results of the finite element method. This study can
be used in teaching, doing scientific research and making calculations.
Application of SCC to
beam-to-column joints with congested rebars of high-rise buildings (pp. 16-20)
MEng. Truong Thi Hong Thuy
Self Compacting Concrete (SCC) is a highly flowable
concrete that can fill into every corner of a formwork rebars, under it's own
weight and achieve excellent consolidation without the need of any vibration.
This concrete is especially useful for constructing structural elements where
vibrating compaction is difficult such as concrete piles, tall columns,
structures with dense rebars or abnormal forms, etc. This paper presents the
application of SCC to beam-to-column joints with congested rebars of high-rise
buildings in Hanoi.
An evaluation of
accelerated corrosion testing for reinforced concrete by impressed current
technique (pp. 21-26)
Dr. Pham Van Khoan, Eng. Vu The Phuong et al
Accelerated corrosion by means of the impressed current technique is
widely used in concrete durability tests. In this study, five concrete
specimens of the impressed current density level 120 mA/cm2 on the actual
degree of steel reinforcing bar corrosion as well as on the concrete strain
behavior due to expansive corrosion products was experimentally investigated.
The prisms were reinforced by 10 mm diameter reinforcing bars. Corrosion was
induced by means of impressed current using electric power supplies. The
results showed that accelerated corrosion using the impressed current technique
was effective in inducing corrosion of the steel reinforcement in concrete.
Reinforced earth retaining
walls in mountain areas with tensional forced displacement (pp.27-31)
Dr. Nguyen Hung Son
As mentioned before in [1], because of flexibility of
reinforcement, reinforced soil structures are very suitable for mining
subsidence area. They can accept tensional forces appeared in the soil and,
therefore, they are subject to less effect from large displacement and curved
surface of ground.
By analyzing displacement of retaining wall surface and surface of ground
during tensional forced displacement, the effect of ground displacement to
reinforced earth retaining walls and the changes of maximum value of tensional
force in the reinforcement during forced displacement of ground are presented
and estimated in this paper.
Additionally, the tensional and compressed forced displacements of ground are
calculated at the same time with different orders also. Then conclusions and
remarks are presented in this paper.
Some environment pollution
problems and measures for environment protection of Minh Khai-Vinh Tuy
industrial zone (pp.32-36)
Dr. Bui Si Ly
This paper presents the existing state of environment
pollution problems (water, air and solid waste pollution) of Minh Khai -Vinh
Tuy industrial zone and proposes particular measures for protection of the zone
such as: architectural and planning solution, water pollution mitigation
solution, air pollution mitigation solution as well as solid waste pollution
solution .
Equivalent rectangular
stress block for high-strength concrete in design of reinforced concrete
members (pp.37-44)
Dr. Nguyen Ngoc Ba
This paper focuses on the applicability of the
Equivalent Rectangular Stress Block (ERSB) of some advanced design codes to
design of high-strength concrete
members. A large volume of experimental data has been used to evaluate five
ERSBs including the newly issued Eurocode 2. It is recommended that the current
Vietnamese design code TCVN 5574:1991 needs to be experimentally verified to
determine the applicable range of concrete strength. It is also recommended
that the ERSB specified in the Eurocode 2 and some other ERSBs are applicable
for design of HSC members subjected to compression or a combined action of
compression and bending but the ERSB specified in the ACI 318-02 may be
unconservative for design of such members.
Modeling of production cost
for selecting the flexible production system (pp.45-50)
Dr. Nguyen Van Nghiem
As we all know, modern production technique and
organization can create many production abilities by which different production
systems with the same quality of goods and production schedule and different
production costs are formulated. Economically, it is reasonable to develop the
producing systems that can ensure the production quality and schedule at
minimum cost. This paper presents the relationship among: the capability of the
production technology and system, the flexibility of the production system and
the organization of the production technology to find out the best way for
minimizing production cost. Based on this relationship, the author presents the
way to model production cost for selecting the flexible production system.
Some method for predicting
the creep of concrete (pp.51-55)
A/Prof. Dr. Phan Quang Minh, A/Prof. Dr. Ly Tran
Cuong, MEng. Hoang Quang Nhu
Concrete creep and shrinkage produce the most
significant time-dependent effect on deformation and prestress losses. Many
factors influence the magnitude and rate of development of creep, including the
properties of the concrete mixture and its constituents. Creep depends on both
the environment and the size and shape of the members. This paper presents some
models and standard methods to predict creep of concrete structures
