Tạp chí KHCNXD

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

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