Đánh giá cơ chế phá hoại và hệ số ứng xử của kết cấu nhà cao tầng bằng bê tông cốt thép chịu động đất

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: THÁI PHONG LÊ, THỊ THANH HƯƠNG NGUYỄN, VĂN THUẦN NGUYỄN, ĐĂNG KHOA PHAN, NGỌC THANH TRẦN

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Xây dựng, 2023

Mô tả vật lý: tr.148

Bộ sưu tập: Metadata

ID: 338098

Thêm vào giỏ Liên kết toàn văn

Nghiên cứu này tiến hành đánh giá cơ chế phá hoại, hệ số ứng xử và hệ số giảm độ cứng của kết cấu nhà nhiều tầng chịu động đất sử dụng phương pháp phân tích tĩnh phi tuyến. Hai kết cấu công trình thực tế bằng bê tông cốt thép tại TP.HCM có quy mô lần lượt là 12 tầng và 20 tầng được khảo sát. Từ kết quả phân tích có thể thấy cơ chế phá hoại của các kết cấu hoàn toàn trái ngược nhau: kết cấu công trình 12 tầng có khớp dẻo hình thành ở cột trước trong khi kết cấu công trình 20 tầng thì khớp dẻo hình thành ở dầm trước. Thêm nữa, hệ số ứng xử được tính toán từ phân tích tĩnh phi tuyến của 2 kết cấu công trình đều cho kết quả cao hơn hệ số ứng xử quy định theo tiêu chuẩn và vì vậy khả năng tiêu tán năng lượng thực tế của kết cấu cao hơn mong đợi. Ngoài ra, hê số giảm độ cứng của các kết cấu công trình cũng được quan sát thấy không giống như qui định. Từ khóa: Động đất
kết cấu nhà nhiều tầng
phân tích phi tuyến
cơ cấu phá hoại
hệ số ứng xử
hệ số giảm độ cứngThis research aims to evaluate the progressive collapse, behavior factor and stiffness scale factor of multi-storey structures under earthquakes using nonlinear static analysis method. Two multi-storey reinforced concrete structures in Ho Chi Minh city, with different number of stories (12 and 20), were carried out to investigate. From the analysis results, the progressive collapse was completely different between two structures: 12 storey building showed the hinge formation at the column first where 20 storey building exhibited the hinge formation at the beam first. In addition, the behavior factors obtained from nonlinear static analysis method were higher than those obtained from design requirements and thus the energy absorption capacity of two structures were higher than expected. On the other hand, the stiffness scale factors were found to be different to design requirements. Keywords: Earthquake
multi-storey structures
nonlinear static analysis
progressive collapse
behavior factor
stiffness scale factor

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