Tạp chí KHCN Xây dựng số 3/2008
Ngày tạo : 15/07/2015
Tạp chí KHCN Xây dựng số 3/2008
GS. TS. Nguyễn Văn Phó, ThS.
Nguyễn Xuân An
Một phương pháp phân tích mờ kết cấu,
KS. Lê Xuân Tùng
Một cách tiếp cận để tính tải trọng động đất bằng
phương pháp phân tích phổ phản ứng theo TCXDVN 375:2006,
ThS. Nguyễn Trường Huy
Một số yêu cầu về khảo sát địa kỹ thuật phục vụ
thiết kế và xây dựng công trình ngầm đô thị,
TS. Trần Minh Đức
Kết quả khảo sát một cự thạch Hàng Gòn,
TS. Phạm Văn Khoan, TS. Nguyễn Nam
Thắng
Giới thiệu giải pháp chống ăn mòn clorua cốt thép
trong bê tông ở môi trường biển Việt Nam bằng chất ức chế canxinitơrit,
ThS. Bùi Thị Thanh Huyền, TS. Hoàng Thị Bích Thuỷ, TS. Lê Thu Quý
Nghiên cứu sự làm việc của hệ anôt bằng lớp kẽm phun
trên bề mặt bê tông trong hệ thống bảo vệ catôt,
ThS. Hoàng Anh Giang
Giám sát chất lượng xây lắp các bộ phận công trình
có yêu cầu khả năng chịu lửa,
KS. Lê Văn Hùng
Giải pháp hợp lý khi chuyển trục lên cao trong thi
công các toà nhà có chiều cao lớn,
KS. Ngô Văn Hiếu
Phương án quan trắc độ lún đê chắn sóng Dung Quất,
ABSTRACT
A method for
structural fuzzy analysis (pp. 3-8)
Prof.
Dr. Nguyen Van Pho, MEng. Nguyen Xuan An
In
this paper, a new method for structural fuzzy analysis is proposed.
Analytical process include 6 steps, as follows: Structural Modelingà inputà
structural fuzzy analysis à output à defuzzifier àapplication.
The
analysis on the basis of the regression and fuzzy analysis is replaced by
deterministic analysis.
To illustrate the proposed method, a simply supported beam is subjected to a
concentrated live load P and a uniformly distributed dead load q is considered.
An approach to modal response spectrum method for
determining determine earthquake load according to TCXDVN 375:2006 (pp. 9-12)
Eng. Le Xuan Tung
TCXDVN
375-2006: Design of structures for earthquake resistance is compiled on the
basis of accepting Eurocode 8 to give supplementary or replace Vietnamese
specific parts (National Annex–NA). Nowadays, we can forecast earthquake and
build acceleration zoning map over the national territory. When applying the
standard, the motion of the earthquake at a specific point on the surface is
shown in elastic acceleration reaction spectrum. Reaction spectrum method (RSM)
is applied effectively to analysis internal force and deformation in linear
elastic behaviour of structure. The content of this analysis is based on the
principle sum action from oscillation that is based on behaviour analysis of
free oscillation composition.
Some requirements on geotechnical engineering
investigation for designing and constructing urban underground structures (pp.
13-16)
MEng.
Nguyen Truong Huy
For
urban underground structures, geotechnical engineering condition pays a
very important role in designing, constructing and
exploiting. This paper presents some technical requirements concerning geotechnical
engineering investigation such as scope and volume of investigating work;
the depth, position and distance of boreholes, and so on...
Investigation results of the Hang Gon stone tomb
(pp. 17-21)
Dr.
Tran Minh Duc
Stone
tomb is a stone structure used to burry death body by ancient people. In Vietnam and
many other places all over the world, there are many stone toms with an
existing time up to thousands of years. The stone tomb in Hang Gon commune,
Long Khanh town, Dong Nai provinve of Vietnam
is the biggest tomb in the South-East Asia.
In
this paper, the author presents the results obtained from an investigation of
the Hang Gon stone tomb including: material’s compositions of the tomb, the
environment around the tomb, and an impact assessment of the environment to the
tomb. Investigated results will be used for the purpose of effectively
restoring and promoting the value this type of monument.
Introduction of chloride-induced corrosion
protection solution for reinforcement in Vietnam
marine structures with corrosion inhibitor of calcium nitride (pp. 22-25)
Dr. Pham Van KHoan, Dr. Nguyen Nam Thang
In
Vietnam
marine environment, due to the hot-humid climate condition containing a high
chloride ion content (Cl-), RC structures have been quickly corroding and
destroying. Results of actual investigations show that after a short time
being operated, rusted reinforcements (at different level) were found in
marine structures. Therefore, the existing state of corrosion should be clearly
understand and corrosion protection solutions should be found out.
In
this paper, the authors introduce a chloride-induced corrosion protection
solution for reinforcement in Vietnam
marine structures with corrosion inhibitor of calcium nitride (CN). The
solution is extracted from results of a Minitrsy-level technical-economical
project named “Anti-corrosion and protection of concrete and reinforced
concrete structures in marine environment completed in November 2003.
Studying the behaviour of zinc layer spraying
over concrete surfaces used as anodes in cathodic protection systems (pp.
26-30)
MEng.
Bui Thi Thanh Huyen, Dr. Hoang thi bich thuy, Dr. Le Thu Quy
One
of the most effective methods to protect reinforcing steel from corrosion is to
use sprayed zinc layer as anodes in cathodic protection systems. This paper
deals with a study on some spraying parameters and electrochemical behaviours
of sprayed zinc layer onto concrete.
The results of research show that arc-sprayed zinc layer is deposited on the
external concrete surface of specimens with the maximum bonding strength at the
optimal sprayed technical parameters such as P = 4 atm, L = 20 cm and U = 16 V.
Sprayed zinc layer over concrete surface can meet requirements as anodes in the
cathodic protection system for steel in cyclically submerged concrete.
Self-dissolved rate of the zinc layer at the wet period is few times greater
than the rate at the dry period.
Quality supervising the fabrication of building
components and products that own a fire resistance (pp. 31-37)
MEng.
Hoang Anh Giang
This
paper presents the concepts of fire resistance of building components and
building products, major factors that may effect their fire resistance are
mentioned as well. Moreover, this article outlines the relevant information
should be applied during the execution of specific building component or
product that is required a fire resistance.
Rational solution for transferring structural
exes from ground level to higher levels in constructing buildings with big
height (pp. 38-44)
Eng. Le Van Hung
In
the world, there have been many tall buildings with heights up to 400-500m.
However in Vietnam
the tallest one is only 120m high. It insinuates that Vietnam is in
the biginning period of constructing building with big height. Therefore, there
are so many subjects relating to this matter that should be sudied and applied.
In
this paper, the author presents the selection of solutions (methods) for
transferring structural exes from ground level to higher levels in constructing
buildings with big height in order to ensure that the vericality of the
building as well as the exact location of the building items are satisfied.
Three methods for transferring co-ordinates from ground level to higher levels
are presented and compared in the paper, using theodolite, total station and
GPS technology. By comparision advantages and disadvantages of these methods,
the paper shows the way to select the best rational solution (method) for
surveying when constructing buildings with big height in the conclusion.
Settlement
monitoring solution for the Dung Quat break-water (pp. 45-51)
Eng. Ngo Van Hieu
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 points out the
settling causes, the settlement constituents of the break-water (settlement of
the soil and that of materials) and proposes a settlement monitoring solution
that is considered to be the most suitable for the break-water. The solution
was approved by the Dung Quat refinery project Management Board and is has been
being applied.
