Tạp chí KHCNXD

Tạp chí Khoa học CNXD - Số 1/2006

Ngày tạo : 15/07/2015

Tạp chí Khoa học CNXD - Số 1/2006

Vai trò của cốt liệu mịn bột đá vôi trong hỗn hợp bê tông tự lèn, download
TS. Nguyễn Như Quý

Phương pháp tính tác động của lốc xoáy (vòi rồng) lên công trình xây dựng ở Mỹ và đề xuất cách tính ở Việt Nam,
KS. Nguyễn Ngọc Tình

Thí nghiệm xác định ảnh hưởng của khối lượng nền tới tần số dao động riêng của tấm trên nền đàn hồi,download
PGS. TS. Đỗ Kiến Quốc; KS. Khổng Trọng Toàn

Sự làm việc sau khi nứt của kết cấu dùng vữa cốt sợi: khảo sát bằng thực nghiệm và phương pháp số
ThS. Trần Quốc Thành; TS. Trần Bá Việt và CTV

Nghiên cứu mối quan hệ giữa mô đun đàn hồi và độ rỗng của vật liệu mẫu
ThS. Trần Bảo Việt; GS. TS. Nguyễn Viết Trung

Cải tạo đất nền công trình bằng phương pháp trộn vôi và ứng dụng cho đất bazan khu vực Nông Cống, Thanh Hoá, 

Chất kết dính có lượng dùng nước thấp - khả năng sản xuất và sử dụng ở Việt Nam,
ThS.Nguyễn Tiến Thành; TS. Hoàng Minh Đức

Quan trắc độ lún đê chắn sóng Dung Quất,
TS. Ngô Văn Hợi

Thiết kế tối ưu tiết diện trong kết cấu dàn thép bằng phương pháp phần tử hữu hạn thông qua việc giải quyết bài toán qui hoạch phi tuyến,
ThS. Nguyễn Hữu Thịnh
The role of limestone powder in self-compacting concrete mix (pp.3-6)
Dr. Nguyen Nhu Quy
For the last decade in Vietnam as well as in other countries of the world, there are number of research works that have been carried out in the field of self-compacting concrete (SCC) due to its advantages over the conventional concrete. Among these advantages is its ability to fill up formworks without any compaction effort. Compared to the conventional concrete mix, the SCC one contains larger amount powder. Therefore one part of powder should be replaced by fine filler. The result of these studies is further to make clear the nature of SCC. By varying the cement to limestone powder ratio, the design strength of SCC can be adjusted. It is also concluded that the lower cement content the stronger effect of limestone powder on the strength of SCC.

The method of calculating tornado effects on structures applied in the USA and the proposed method for applying to Viet nam (pp. 7-14)
Eng. Nguyen Ngoc Tinh
In this paper, the method of calculating tornado effects on structure that is being applied in the United States is presented. Based on that, the author proposes a method for applying to Viet nam. In the proposed method, some basic parameters are modified in order to increase the accuracy and to match with the applying conditions in Vietnam.
An experiment to determine the influence of the foundation mass on vibrating frequency of plates on foundation (pp. 15-18)
A/Prof. Dr. Do Kien Quoc. Eng. Khong Trong Toan
Until now, in dynamic analysis of concrete plate on foundation, the mass of foundation has not been considered. The authors of this paper have experimentally studied the influence of the foundation participating in the vibration of the plate. The results have proved that the influence of the foundation mass on vibrating frequency of the plate is significant so that it is necessary to consider in analysis. The study is meaningful in the dynamic analysis of the plate on elastic foundation.
Post-crack behaviour of structures using fibre reinforced mortar: experimental and numerical investigations (pp. 19-23)
MEng. Tran Quoc Thanh, Dr. Ahmed Toumi, Dr. Naclet Turatsinze, Dr. Tran Ba Viet
The paper focuses on cracking propagation in structures using fibre-reinforced mortar (FRM). Thus the major influence of the interlocking between the two cracking surfaces is investigated. The work associates experiment and simulation with the purpose of quantifying the interlocking for relevant and efficient cracking modelling. Direct tension tests of notched FRM specimens were firstly conducted to obtain its tensile strength and its residual normal stress - crack width relationship. Its Young's modulus was determined from compression tests. The structural behaviour of the FRM was investigated by the three-point static bending tests on prism specimens. The crack propagation was monitored using a video-microscope with a maximum enlargement of x175. The identified and quantified parameters were used to model the above-mentioned bending tests. Numerical calculations were performed using CAST3M code developed in France by CEA (Centre for Atomic Energy). The comparison of modelling and experiment results shows a good agreement and proves the important role of interlocking on the cracking mechanism.

Studying on the relationship between elastic modulus and porosity of the model material (pp. 24-31)
MEng. Tran Bao viet, Prof. Dr. Nguyen Viet Trung
In the article, a mathematical model was presented to establish the relationship between elastic modulus and porosity of the model material and the method of fabrication of material constitued of glass marbles.
Improving engineering soil by mixing with lime and the application of the method to bazan soil of Nong Cong district, Thanh Hoa (pp. 32-34)

MEng. Nguyen Hoai Nam, MEng. Nguyen Van Ta
Based on the analysis of physical, chemical and reactions taken place in the soil-lime mixture, the paper explains the varying process of physical and mechanical properties of clayey soil mixed with lime. Based on that, the authors present the ability of improving the soil by mixing it with lime and introduces the result obtained by applying this method to the bazan soil in Nong Cong district, Thanh Hoa province.

Binder with low water requirement - the production and application availability in Viet Nam (pp. 35-37)
MEng. Nguyen Tien Thanh, Dr. Hoang Minh Duc

Binder with low water reqiurement, a product of the mechanical-chemical activation of cement system is a high performance new generation binder. Making and using this binder provide effective way to solve not only technical, economical but also ecological problems. Basic concept of binder with low water requirement, analysis of the production and application availability in Viet Nam are shown in this paper.

Monitoring the settlement of Dung Quat break-water (pp. 38-40)
Dr. Ngo Van Hoi
Dung Quat break-water is one of the important construction items built in the Dung Quat bay. According to the soil investigation results, the geological conditions of the soil in the bay is very complicated so the break-water is susceptible to settlement during being constructed as well as operated. In this paper, the author analyzes the settling causes, the settlement constituents of the break-water and proposes a settlement monitoring solution for the break-water aiming at three purposes : simple, effective and accurate.

Optimal design of cross sections in steel truss system by finite element method and solution of nonlinear programming problem (pp. 41-47)

MEng. Nguyen Huu Thinh
This paper presents an automatical optimal design of cross sections with shape of tubular in steel truss systems by researching and applying: simplex algorithm, nonlinear programming based on a sequence of linear programs and finite element analysis.

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