多层砖房裂缝的根源（The root of the cracks in multi-storey brick houses）.docVIP

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多层砖房裂缝的根源（The root of the cracks in multi-storey brick houses）.doc

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多层砖房裂缝的根源（The root of the cracks in multi-storey brick houses）

多层砖房裂缝的根源（The root of the cracks in multi-storey brick houses） The root of the cracks in the multi-storey brick house 2005-6-21 [large medium small] [printing] The multi-storey brick houses usually crack, especially in the northern regions, where the climate is dry, the annual temperature difference is large, and the temperature difference in the summer days is larger. After three years, even longer, the wall cracks and cracks form in the form of oblique cracks, vertical cracks, horizontal cracks, and eight character cracks. It affects the function and aesthetics of the building, which can reduce the safety of the structure and the poor seismic performance. Therefore, it is very important to prevent cracking of brick walls, but the causes of cracks are more complex. A summary of the investment and prevention measures. Keywords: block cracks 1. Material characteristics 1) brick masonry is a brittle material, its ultimate strain is very small, it is only one over ten of the concrete, tensile strength and general wall for the unreinforced masonry (local Rachel reinforcement is only tectonic Settings), anti-cracking performance is poor, and masonry internal stress distribution is very uneven, so easy to produce cracks in tensile stress area, this is one of the main reasons. The dispersion of brick and mortar strength is larger, which makes the masonry strength less uniform. The masonry in the dry natural environment, its shrinkage deformation is larger, resulting in the wall cracking. The soil quality of brick clay is poor at present, the average machine brick does not meet the requirement of anti-freeze performance, and after 1-2 winters, it is cracked. 2. Construction factors (1) construction speed too fast, some a layer on Monday, even faster, at this time the strength of the masonry has yet to reach the design intensity, and rapid deformation of foundation, soil stress is backward, the uneven settlement of foundation soil early to produce. Inconsistency within the