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
ABSTRACT
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.
