Đánh giá độ tin cậy trong ứng xử của dầm bê tông cốt thép chịu uốn

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: ĐÌNH NHÂN ĐÀO, QUỐC THANH NGÔ, DUY QUÂN PHẠM

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Xây dựng, 2024

Mô tả vật lý: tr.227

Bộ sưu tập: Báo, Tạp chí

ID: 452805

Thêm vào giỏ Liên kết toàn văn

Đánh giá độ tin cậy (ĐTC) trong ứng xử của dầm bê tông cốt thép (BTCT) chịu uốn, cung cấp góc nhìn cụ thể, về mức độ ảnh hưởng của độ biến động của một số biến thiết kế đến cường độ chịu uốn của tiết diện dầm BTCT. Trên cơ sở đó khảo sát ĐTC của cấu kiện dầm cũng như phân bố xác suất chuyển vị của nó. Phương pháp phân tích bậc nhất (gọi tắt là FORM) [1] và phương pháp Monte Carlo sẽ được sử dụng để đánh giá ĐTC. Cả phân tích tuyến tính và phân tích phi tuyến đều được sử dụng để đánh giá. Kết quả phân tích độ nhạy xác định các biến ảnh hưởng lớn đến dầm là: cường độ bê tông (Rb), tải trọng (P), cường độ thép (Rs), diện tích thép (As). Đánh giá ĐTC bằng phương pháp Monte Carlo kết hợp phân tích phi tuyến cho ra ĐTC nhỏ nhất so với các phương pháp còn lại. Kết quả phân tích và xây dựng phân phối xác suất chuyển vị lớn nhất của dầm khảo sát thì hệ số biến động về chuyển vị khá bé, bằng 7,1%. Từ khóa: Độ tin cậy
phân tích bậc nhất
phương pháp Monte Carlo
phân tích phi tuyến
phân tích tuyến tính, chuyển vị.The research evaluates the reliability of bent-reinforced concrete beams, in order to provide a specific view on the influence of the variation of some design variables on the flexural strength of the reinforced concrete beam section. From this, the research continues to carry out a survey of the reliability of the reinforced concrete beam structures as well as its displacement probability distribution. In this paper, there are two methods used to evaluate the reliability: The First Order Reliability Method (FORM) and Monte Carlo Method. Besides, researchers also use the linear analysis and nonlinear analysis for the evaluation. The results of sensitivity analysis identify variables that greatly affect the beam including concrete strength (Rb), loading capacity (P), steel strength (Rs), and steel area (As). Evaluating the reliability by Monte Carlo method combined with nonlinear analysis has given the smallest reliability compared with the other methods. The results of analyzing and constructing the maximum displacement probability distribution of the beam being investigated have showed that the coefficient of variation in displacement is quite low, only 7.1%. Key word: Reliability
the first order reliability method
monte Carlo method
linear analysis
Nonlinear analysis
displacement.

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