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Prevention of Damages to Concrete Gutters – Considerations on the Design of Expansion Joints In the last few years at some airports cracking was observed in concrete gutters, which are implemented in large areas as drainage. In order to reveal the influences on this cracking both laboratory investigations as well as numerical analyses referring the expansion joints and the gutters were carried out. The main focus was on the stiffness of the joint filling materials. Due to seasonal variations in temperature concrete pavements casted in wintertime tend to expand by higher temperatures in summer, whereas the deformations of the free edges can amount up to 5 to 10 mm. Such deformations should be met without any restrain. If this can not be ensured, horizontal pressures on the side‐walls of the gutters are raised. These pressures mainly depend on the stiffness of the joint filling material. In the adequate laboratory tests the stress‐strain‐relations for various materials was determined. For the mostly used bituminous soft board a comparatively stiff behaviour was proved. Thus the observed cracking mostly can be correlated with restraint stresses raised by such joint filling material.  相似文献   

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Damages to Parking Decks with insufficient reinforcement unable to limit crack width During construction of parking decks the reinforcement to limit crack widths is often measured and placed insufficiently. This lack of construction normally leads to uncontrollable crack formation. In order to guarantee the durability of the building during its service life precaution and restoration is necessary, i. e. the coating of the parking surface with crack bridging systems, possibly in combination with preceding filling actions of the cracks. With it the efficiency of the actions has to be aligned to the expected width of the cracks. In order to capture the change of crack width caused by weather in a realistic way, the changes should be measured under load and during changing temperatures. Relying on this research data, a realistic estimation of the expected crack width can be done.  相似文献   

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《Bautechnik》2000,77(6):444-444
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