Experimental investigation of impact behaviour of timber formwork beams strengthened with cfrp strips

The formwork systems used in the construction of buildings together with the developing construction technologies have also changed and improved significantly. Especially in the production of high-rise buildings, formwork systems which can be installed quickly, durable to external loads, used more than once, have become a necessity. In the formation of such formwork systems, timber and composite timber are preferred for reasons such as durability, ease of installation, lightness compared to steel systems and easy to use multiple times. The most commonly used structural component in forming such formwork systems are formwork beams and these beams may be damaged due to various reasons during their lifetime. Within the scope of this study, H20 top P type timber formwork beams with 1800 and 2450 mm length which is among the products of DOKA(c) company is damaged under the effect of static loading up to a high load level of 85% of the maximum carrying capacity and after being retrofitted using anchored CFRP strips, performance and behavior of the beams under the influence of various loading types such as static, fatigue and impact are investigated experimentally. Two different lengths of retrofitted timber formwork beams were tested by applying monotonic static, fatigue and impact loading and comments were made about the effects of the retrofit method on performance under different loading types.