Áp dụng quy trình cải tạo động đất toàn diện cho các công trình thép sử dụng bộ giảm chấn nhớt phi tuyến

International Journal of Civil Engineering - Tập 17 - Trang 1261-1279 - 2018
Mohammad Bahmani1, Seyed Mehdi Zahrai2
1Department of Civil Engineering, Arak Branch, Islamic Azad University, Arak, Iran
2Center of excellence for Engineering and Management of Civil Infrastructures, School of Civil Engineering, The University of Tehran, Tehran, Iran

Tóm tắt

Nghiên cứu này trình bày việc áp dụng một phương pháp mới để xác định các đặc tính của bộ giảm chấn nhớt phi tuyến (NLVDs). Đồng thời, nghiên cứu cũng xác định mức độ cải tạo tối ưu (ORL), bằng cách cung cấp một công thức mới và đơn giản mà không cần tính toán phức tạp. Tỷ lệ dịch chuyển giữa các tầng được coi là tham số hiệu quả để tính toán chi phí thất bại của cấu trúc và xác định các trạng thái giới hạn. Để xác định ORL trong các cấu trúc thép thấp, trung bình và cao tầng, ba cấu trúc chuẩn có đặc tính động học khác nhau đã được nghiên cứu. Ngoài ra, để xác thực kết quả trong các khu vực khác nhau với các mức độ nguy hiểm động đất khác nhau, các bản ghi động đất đại diện cho ba mức độ nguy hiểm động đất đã được sử dụng trong phân tích lịch sử theo thời gian. Dựa trên các kết quả số liệu từ các phân tích lịch sử theo thời gian phi tuyến, quy trình thiết kế toàn diện này có thể được sử dụng hiệu quả để thực hiện thiết kế chịu động đất cho các công trình thép với NLVDs, từ đó đáp ứng các mục tiêu hiệu suất cấu trúc cho bất kỳ bản ghi động đất nào ở bất kỳ cường độ nào. Đáng chú ý, việc sử dụng quy trình thiết kế toàn diện làm giảm tỷ lệ dịch chuyển giữa các tầng xuống dưới 0.7 ở hầu hết các tầng của tòa nhà, cho thấy rằng tòa nhà vẫn ở trạng thái có thể sử dụng ngay lập tức dưới các bản ghi động đất đã áp dụng. Hơn nữa, nó có thể giảm hiệu quả chi phí vòng đời và thiết lập sự cân bằng giữa chi phí cải tạo và chi phí giảm thiểu thất bại một khi việc cải tạo cấu trúc được thực hiện.

Từ khóa

#bộ giảm chấn nhớt phi tuyến #cải tạo động đất #độ dịch chuyển giữa các tầng #cấu trúc thép #chi phí vòng đời

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