Tạp chí KHCNXD

Tạp chí Khoa học CNXD - Số 1/2005 (130)

Ngày tạo : 15/07/2015

Tạp chí Khoa học CNXD - Số 1/2005 (130)

·         Viện KHCN Xây dựng và công tác biên soạn các tiêu chuẩn xây dựng
PGS. TS. Cao Duy Tiến

·         Phương pháp xác định quan hệ ứng suất-biến dạng của bê tông chịu nén từ thí nghiệm uốn và nén uốn mẫu có mặt cắt hình tròn
TS. Nguyễn Ngọc Bá

·         Đánh giá độ tin cậy về ổn định cục bộ của thanh thành mỏng chịu nén
ThS. Đỗ Văn Bình ; PGS.TS. Lê Xuân Huỳnh

·         Giới thiệu phương pháp phun vữa trong sửa chữa cọc khoan nhồi có chất lượng không đồng nhất
PGS.TS. Nguyễn Viết Trung ; KS. Nguyễn Thị Tuyết Trinh

·         Xác định tốc độ ăn mòn thép bằng phương pháp điện trở phân cực
KS. Vũ Thế Phương; KS. Trần Nam

·         Hệ thống xử lý hỗn hợp nước thải và khí thải lò hơi cho các cơ sở sản xuất tấm lợp fibro xi măng ở Việt Nam
ThS. Nguyễn Sơn Lâm ; ThS. Nguyễn Trinh Hương

·         Phổ phản ứng gia tốc chuẩn kiến nghị dùng trong thiết kế kháng chấn ở Việt Nam
GS.TSKH. Nguyễn Đăng Bích ; TS. Nguyễn Thế Đệ ; GS.TS. Nguyễn Đình Xuyên ; ThS. Phạm Đình Nguyên

·         Biến đổi kích thước của vật liệu siêu cách nhiệt PU Vietrust thử nghiệm trong môi trường kiềm
ThS. Mai Thanh Nga ; PGS.TS. Lê Xuân Quế

·         Áp lực từ trong ra ngoài tác dụng lên công trình xây dựng do ảnh hưởng của lốc xoáy (vòi rồng)
KS. Nguyễn Ngọc Tình

Vietnam Institute for Building Science and Technology (IBST) with the task of developing building standards and codes (pp.3-4)

A/Prof. Dr. Cao Duy Tien

This paper highlights the role of IBST in the developing of building standards and codes for the purpose of supporting the Vietnam Ministry of Construction in the State management duty with respect to the Construction Industry and in the approaching International standard system for harmonization. During the last year (2004) IBST has developed 10 of 33 Vietnam building standards (TCXDVN) issued by Vietnam MOC. Another 10 important Vietnam building standards and codes scheduled to be developed in 2005 are also stated, showing the great contribution of IBST to the development of the Vietnam Construction Industry.

A method for determining the compressive stress-strain curves of concrete from flexure tests of specimens having circular cross-sections (pp. 5-9).

Dr. Nguyen Ngoc Ba

This paper presents a new method for determining the compressive stress-strain curves of concrete from flexure tests of plain or reinforced concrete specimens having circular cross-sections. This method is based on the strain compatibility and the force and moment equilibrium conditions established on the critical cross-section of the test specimen. This method is applicable to different kinds of tests such as pure flexure tests, tests of columns under constant end eccentricities, or tests of columns under constant neutral axis depth.

Reliability assessment on local buckling of thin-walled members under axial compression (pp.10-16).

MEng. Do Van Binh, A/Prof. Dr. Le Xuan Huynh

This paper presents a study of reliability assessment on local buckling of thin-walled members under axial compression based on the critical stress values calculated by theoretical methods. Random data of geometrical dimensions of the thin-walled member sections were taken in both of the critical stress and reliability assessment calculations. Reliability index (b M) on local buckling of thin-walled members was derived. Effect coefficient (Kxi) of variation of the random data on the geometrical dimensions for the safety margin on local buckling of the thin-walled members was proposed. Numerical examples with the random data of geometrical dimensions of the thin-walled members available on the constructional steel market in Vietnam, were investigated.

Introduction to remedial methods for non- homogeneous piles using Jet Grouting (pp.17-24)

A/Prof.Dr. Nguyen Viet Trung, Eng. Nguyen Thi Tuyet Trinh

This paper introduces remedial methods for non-homogeneous bored piles using Jet Grouting method, especially Column Jet Grouting with jet grouting machine having the triple pipe. This method is effective, applied for remedial works at some building constructions and bridges in Vietnam. Some results are also presented. Based on the tesing results, the effect of the method and prospect of applying this method in Vietnam is confimed.

The measurement of steel corrosion rate by polarization resistance technique (pp. 25-30)

Eng. Vu The Phuong, Eng. Tran Nam.

A simple method is presented to measurement the corrosion rate of steel rebar in reinforcement concrete and steel beam in field structure. The method is based on the determination of polarization resistance of steel. Measurement were done by using potentiostat Gamry PC4/750 computer controled. The technique investigated furnishes results with good precisely and more rapidly, and the technique has been proven feasible for both reinforcement concrete and steel structure.

Combination treatment system for wastewater and toxic gas discharged at fibro cement roofing tile factories (pp. 31-34)

MEng. Nguyen Son Lam, MEng. Nguyen Trinh Huong

This paper introduces the combination treatment system for wastewater and gas discharged at fibro cement roofing tile production factories. Neutralization of wastewater with high pH value by discharge acid gas occurred in coal ash firing in water boiler is taken place in the absorption tower. After the treatment, wastewater and gas discharged into environment meet Vietnamese emission standards (TCVN). The treatment system is economically feasible and can be applied for most roofing tile production factories in Vietnam.

Standard acceleration response spectrum recommended to be applied to design of earthquake resistance in Vietnam (pp. 35-45.)

Prof. DSc. Nguyen Dang Bich, Dr. Nguyen The De, Prof. Dr. Nguyen Dinh Xuyen and MEng. Pham Dinh Nguyen.

The most important question for the design of earthquake resistance for structures and building constructions in the seismic areas of Vietnam is the establishing the Standard acceleration response spectrum. In this paper, the authors present the way to establish the above response spectrum based on the Vietnam seismic data available. The result obtained is reliable, and to some certain extent it is similar to the Standard acceleration response spectrum in the American standard UBS-1997.

The change of geometric parameters of thermal isolating PU Vietrust exposed to alkaline solution (pp. 46-48).

MEng. Mai Thanh Nga, A/Prof. Dr. Le Xuan Que

Porous polyuethane (PU) is a super-light building material widely used for producing ceiling, cladding, thermal isolating partitions in civil and industrial structures. However, the stability and working life of this material has not been studied yet.

This paper presents the expansion test of a thermal isolating building material, called PU Vietrust, exposed to alkaline solutions of pH up to 12, which is similar to the environment in concrete and mortar. It has been found that after 60 days testing at room temperature without stirring, the maximum expansion of dimension of the sides is of some 5%, while that of the volume is of some 7%.

Inside-to-Outside pressure acting on building structures due to tornado (pp. 49-56.)

Eng. Nguyen Ngoc Tinh

When spreading over building structures, there are 3 force components appeared caused by a tornado. one of these components is the inside-to-outside pressure on the structure (if the structure is sealed). This pressure appears because the pressure at the centre of the tornado is very low and the acting duration of the tornado on the building is very short while the initial atmotsphere pressure inside the building is equal to that of the surroundings.

In this paper, based on the available different equations studied by the oversea countries on tornados, the author goes on studying the impact of tornado on building structures and gives an example illustrating the calculation of this impact.

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