Tạp chí KHCNXD

Tạp chí Khoa học Công nghệ Xây dựng số 2/2012

Ngày tạo : 14/07/2015

Tạp chí Khoa học Công nghệ Xây dựng số 2/2012

PGS.TS. Đoàn Thế Tường
Một số vấn đề địa kỹ thuật môi trường trong xây dựng hầm tầu điện ngầm ở Việt Nam, download
PGS. TS. Trần Chủng, PGS. TS. Võ Văn Thảo, TS. Lê Minh Long, TS. Đỗ Tiến Thịnh, KS. Ngô Mạnh Toàn, ThS. Trần Ngọc Cường, KS. Nguyễn Trung Kiên

Thí nghiệm mối nối nhà công nghiệp hoá chịu tải trọng động đất (phần 2), download
TS. Cao Duy Khôi, ThS. Ngô Hoàng Quân

Hiện tượng co ngắn cột trong thiết kế nhà cao tầng và siêu cao tầng bê tông cốt thép,download
PGS. TS. Nguyễn Xuân Chính, KS. Nguyễn Chí Hiếu

Đánh giá độ tin cậy và tình trạng kỹ thuật của kết cấu xây dựng theo những dấu hiệu mặt ngoài kết cấu, download
NCS. Nguyễn Hồng Hải, PGS. TS. Nguyễn Xuân Chính
Tầng cứng trong nhà cao tầng,download
TS. Đinh Quốc Dân

Thí nghiệm brazilian cho đá dị hướng: cường độ kéo tách,download
TS. Phạm Quyết Thắng

Ứng xử của khối đất gia cố trong xây dựng tường chắn và mố cầu, download
TS. Vũ Đình Luyến
Đặc điểm kỹ thuật trong thi công giàn mái kết cấu thép khẩu độ lớn nhà thi đấu thể dục thể thao thành phố Đà Nẵng, download
TS. Chu Thị Bình
Nghiên cứu thực nghiệm cột ống thép nhồi bê tông trong điều kiện cháy, download


Some problems in geotechnical environment in the underground construction in Vietnam (pp.3-8)
A/Prof. Dr. Doan The Tuong
The paper deals with the geotechnical, economical, social conditions and techno-technical challenge to be taken in consideration in underground construction in Vietnam. A study for procedure of assessing the environmental impact of underground construction also is proposed.
Experimental study on half-precast concrete connection under the action of seismic loading (part 2) (pp.9-17)
A/Prof. Dr. Tran Chung, A/Prof. Dr. Vo Van Thao, Dr. Le Minh Long, Dr. Do Tien Thinh,  Eng. Ngo Manh Toan, MEng. Tran Ngoc Cuong, Eng. Nguyen Trung Kien
From 2009 to 2011, researchers from Vietnam Institute for Building Science and Technology (IBST) have been conducted an experimental study to investigate the mutual affect of connections used in half-precast concrete structure that being developed in Vietnam under the action of seismic loading. Because the content of this study is quite large as well as the limit of this Journal, this study will be published in three issues (1/2012, 2/2012, 3/2012).  In the first issue, selection and design of test specimen and loading system was presented. In this issue, construction and setting up of test specimen, instrumentation system, loading history are presented.
Column shortening in design of tall and super-tall RC buildings (pp.18-22)
Dr. Cao Duy Khoi, MEng. Ngo Hoang Quan
In design of tall buildings and super tall buildings, apart from calculation for columns, beams and slabs, some peculiarities should be well aware of such as column shortening and differential column shortening. These phenomena may cause serious impacts on horizontal load bearing members such as beams-slab system and lead to cracking of non load bearing components like glass walls and partition walls. Theoretical and experimental researches on these issues have been carried out in all over the world since the 70s of the last century. However, the concept of column shortening is still relatively new in Vietnam and receives few necessary attentions.
Considering numbers of typical projects, this article summarizes several issues related to column shortening which might help designers pay more attention to one of the new and essential concerns for high rise buildings design in Vietnam.

Assessment of the reliability and technical conditions of building structures under the signs of tensile surface (pp.23-27)
A/Prof. Dr. Nguyen Xuan Chinh, Eng. Le Chi Hieu
This next article of the same name published in the Journal of Science and Technology building No. 1/2012. In this section, if a cause of work incidents and problems of probability forecasts. Assess the technical status of the building from the impact of an earthquake or fire.
Outriggers braced tall buildings (pp.28-33)
NCS. Nguyen Hong Hai, A/Prof. Dr. Nguyen Xuan Chinh
Modern tall buildings have been becoming more flexible and taller than in the past owing to the growing use of high-strength or lighter-weight materials and advanced construction techniques. As a result, these tall buildings are more sensitive to dynamic excitations by wind or seismic loads. Nowadays, the outrigger braced tall buildings are popular in the world and about 73% of the tall buildings constructed globally from the beginning of 2000 have been adopted core and outrigger system as the lateral load resisting system as per CTBUH report. Therefore, in this paper, the behavior of outrigger bracing tall buildings is summarised and presented although there are many other structural systems available to resist lateral loads.
Brazilian experiment for anisotropic rocks: splitting tensile strength (pp.34-40)
Dr. Dinh Quoc Dan
The Brazilian tensile strength test (splitting tensile test) is a well-known indirect method for determining the tensile strength of rocks and other brittle materials such as rock, concrete. Besides compressive or shear strength, the tensile strength is a key parameter for determining the load bearing capacity of rocks, their deformation, damage and fracturing,  crushing, etc. and is used  to analyze the stability and serviceability of rock structures.
This paper is one of a series of papers related to the Brazilian tests on anisotropic rocks. The experimental research in this paper focus on investigations on the anisotropic strength behavior of rocks in the splitting tensile test, with emphasis was placed on the influence of the spatial position of anisotropic weakness plane to the loading direction on the tensile strength and the failure pattern. A total of 555 indirect tensile strength tests were conducted on four different types of rock samples ranging from nearly isotropic (sandstone) to anisotropic (gneisses, slate). The measured peak strength reveals a strong correlation to the orientation between sample axis and structural plane, but less correlation to the angle between loading direction and structural plane.

Bbahavior of geosynthetic-reinforced soil mass for walls and bridge abutments (pp.41-48)
Dr. Pham Quyet Thang
In current design methods for geosynthetic-reinforced soil (GRS) structures, there is a fundamental design assumption that the reinforcement strength and spacing play an equal role in the performance of a structure such as GRS wall/abutment, i.e., larger reinforcement spacing can be fully compensated by using proportionally stronger reinforcement and lead to the same performance.  This has encouraged designers to use larger reinforcement spacing in conjunction with stronger reinforcement for reducing construction time and cost.   Based on recent studies and equations, however, it is indicated that reinforcement spacing plays a much more significant role in the performance of a GRS structures than reinforcement strength.  In this paper, series of full scale tests on geosynthetic-reinforced soil composite (GRSC) and  an analytical model that is capable of reflecting more accurately the roles of reinforcement spacing and reinforcement strength are presented. 
Using available data from large-scale experiments, it is shown that the analytical model provides a much improved tool for predicting reinforcement forces at failure than the current design equation.

Technical features of execution of big aperture roof steel constructure of Danang sporting hall (pp.49-54)
Dr. Vu Dinh Luyen
After practical supervision of Danang city Sporting event hall, the author of this article presents the features of fabrication, assembly, check and acceptance of the project roof steel structure; Describes some assembly errors, proposes improved methods for repairing the errors on site; Recommends some experiences for execution and supervision of similar projects and puts forward to study some concrete questions in order to perfect design and execution works of big aperture steel structures in Vietnam.
Experimental research of concrete filled steel tube columns in fire conditions (pp.55-61)
Dr. Chu Thi Binh
Concrete filled steel hollow section columns can carry important loads and therefore are used extensively in the construction of high-rise buildings. Ten columns filled with self-compacting concrete embedding another steel profile have been tested in the Fire Engineering Laboratory of the University of Liege - Belgium. The non linear finite element software SAFIR developed at the University of Liege has been used to simulate the thermal and structural behavior under fire conditions. A good agreement between numerical and experimental results has been obtained. This shows that SAFIR code can predict well the behavior of CFSHS columns. This paper gives the tested and simulated results of the research.

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