ẢNH HƯỞNG CỦA KHỐI XÂY ĐẾN KHUNG CÓ TƯỜNG CHÈN CÓ VÀ KHÔNG CÓ LỖ MỞ

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Tác giả: Thị Thu Nga Nguyễn, Nam Hưng Trần

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Journal of Science and Technique: Section on Special Construction Engineering, 2023

Mô tả vật lý: tr.84

Bộ sưu tập: Metadata

ID: 333279

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Ảnh hưởng của khối xây chèn đến sự làm việc tổng thể của khung đã được biết đến rộng rãi nhưng trong mô hình phân tích, điều này thường bỏ qua. Trong thực hành tính toán, vì thiếu kỹ thuật mô phỏng kết cấu khung chèn hiệu quả nên kết cấu thường được thiết kế như khung không khối xây và khối xây thì được coi là tải trọng tĩnh. Các nghiên cứu hiện nay chỉ ra rằng kết cấu khung chèn không có lỗ mở cho ứng xử tốt hơn khung không khối xây khi chịu tải trọng tĩnh hoặc động, tuy nhiên khi khối xây chèn có lỗ mở thì mô hình phân tích gặp khó khăn. Trong nghiên cứu này, khối xây chèn được xem như là kết cấu bao che chịu tải trọng. Thủ tục phần tử hữu hạn cho tính chất hiệu dụng của khối xây đàn nhớt có vết nứt dựa trên kỹ thuật đồng nhất được đề xuất để tính đến ảnh hưởng của mật độ vết nứt và thời gian. Đây cũng là phương tiện khá đơn giản để mô phỏng sự làm việc của khung chèn có và không có lỗ mở. Kết quả cho thấy, dưới tác dụng của tải trọng tĩnh, khối xây chèn ngay cả trường hợp không có lỗ mở đều làm giảm đáng kể chuyển vị của khung so với khung không khối xây và khối xây gây ảnh hưởng đáng kể đến sự biến đổi trường ứng suất chính trong khung. Do đó, cần phải tính đến ứng xử của khối xây đàn nhớt có vi vết nứt để đánh giá chính xác hơn sự làm việc tổng thể của khung và khối xây chèn có và không có lỗ mở.The effect of masonry infills on the global response of frames is widely recognized but it is often neglected in the analytical models. Because of lack of effectively technique for modelling the infilled frame, in current practice, the structure is normally designed as a pure frame and masonry is considered as static load. Researches show that an infilled frame structure without opening actually performs better than a bare frame one against statistic or dynamic forces but when masonry infills have opening, however, the analytical model is again difficult. In this study, masonry infills are considered a building envelope with load-bearing function. A finite element procedure for the effective properties of microcracked viscoelastic masonry based on homogenization technique is provided to take into account the influence of crack density and time. It is also recommended as a simple means of modeling the behavior of the masonry infilled frame with and without opening. The results showed that under statistic loads, the masonry infills even in case with opening much reduce the displacement of frame compared with bare frame and the masonry significantly influences the principal stress field upheaval in the frame. This suggests that it is necessary to take into account the behavior of micro-cracked viscoelastic masonry to evaluate more accurately the global response of frames and the masonry infills with and without opening.

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