Ứng xử động học phi tuyến kết cấu khung liên hợp chịu tải trọng động đất

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Tác giả: NGỌC KHOA HỒ, THỊ PHƯƠNG LOAN LÊ, VĂN THỰC LƯU, CHÍ CÔNG VŨ

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Xây dựng, 2024

Mô tả vật lý: tr.66

Bộ sưu tập: Báo, Tạp chí

ID: 392714

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Bài báo đề xuất một phương pháp mới sử dụng hàm ổn định và mô hình dẻo phân tán để nghiên cứu ứng xử động học phi đàn hồi phi tuyến tính của kết cấu khung CFST chịu tải trọng động đất bằng ngôn ngữ lập trình Fortran. Ưu thế của phương pháp này là khả năng nghiên cứu chính xác ứng xử phi tuyến chỉ với một phần tử dầm cột trên cấu kiện thay vì sử dụng các phần tử khối và tấm vỏ như truyền thống, từ đó giúp cải thiện hiệu suất trong quá trình phân tích mô hình. Thuật giải phi tuyến dựa vào phương pháp tích phân trực tiếp Newmark-β đã được phát triển để giải các phương trình vi phân chủ đạo của chuyển động. Ma trận độ cứng phần tử được tích phân thông qua khung tích phân số Gauss-Lobatto trong khi ảnh hưởng phi tuyến hình học P-δ và P- ∆ được xem xét thông qua việc áp dụng hàm ổn định và ma trận hình học tương ứng. Độ tin cậy và tính chính xác của phương pháp đề xuất được kiểm chứng thông qua việc so sánh kết quả phân tích với kết quả từ chương trình Abaqus. Kết quả đã chứng minh rằng việc sử dụng phần tử dầm cột trong phương pháp đề xuất mang lại kết quả chính xác, đồng thời giảm đáng kể tài nguyên tính toán. Đối với kết cấu khung CFST, thời gian phân tích bằng phương pháp đề xuất đã giảm gần 128 lần so với chương trình Abaqus. Do đó, phương pháp này hứa hẹn là một công cụ hữu ích cho thực hành thiết kế và phân tích kết cấu CFST chịu tải trọng động đất. Từ khóa: Phân tích phi tuyến
thép nhồi bê tông
phần tử dầm cột
mô hình dẻo phân tán
ứng xử động học
tải động đất.This paper proposes a new method using stability functions and a distributed plasticity model to analyze the dynamic nonlinear inelastic behaviors of concrete-filled steel tubular (CFST) composite framed structures subjected to seismic loads via the Fortran programming language. The advantage of this method is the ability to accurately study the nonlinear behavior using only one beam-column element per member instead of using solid and shell elements as in traditional methods, thereby improving the model analysis time. A nonlinear algorithm based on the Newmark-β direct integration scheme has been developed to solve the governing differential equations of motion. The element stiffness matrix is integrated through the Gauss-Lobatto numerical integration scheme, while the nonlinear geometric effects P-Δ and P-δ are considered using stability functions and corresponding geometric matrices. The reliability and accuracy of the proposed method are verified by comparing the analysis results with those obtained from Abaqus. The results demonstrate that, by using beam-column elements for simulation, the proposed method provides accurate results, while significantly reducing computational time. For the CFST framed structure, the analysis time using the proposed method has been reduced by almost 128 times compared to the Abaqus program. Therefore, the proposed method promises to be a useful tool for the practice of designing and analyzing CFST structures subjected to seismic loads. Keywords: Nonlinear inelastic analysis
CFST
Beam-column element
distributed plasticity model
dynamic behaviors
seismic loads.

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