Prediction of Elastic-Softening-Debonding behavior for CFRP Tendon-Adhesively bonded anchors
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The mechanical behaviors of RC plates with opening strengthened by the CFRP(Carbon Fiber Reinforced Polymer) are studied.The strengthening effects are analyzed by comparing the cracking load,the ultimate load,the flexural deformation and the failure type of these members.The main parameters considered are the thickness of CFRP,the size and the location of the opening.The results indicate that the ultimate capacity can be improved significantly as well as the ultimate deformation and the cracking load can also be increased.
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In tendon transfer surgeries sufficient stability of the tenorrhaphy is essential. In addition to the choice of a suitable technique, adequate overlap of donor and recipient tendons must be ensured. The aim of this study was to investigate the tensile strength with regard to tendon overlap of a recently published tenorrhaphy, termed Woven-Fridén (WF) tenorrhaphy, which displayed higher tensile strength and lower bulk when compared to the established Pulvertaft technique. For this purpose, WF tenorrhaphies with 1.5 cm, 2 cm, and 3 cm tendon overlap were performed and subsequently tested for different biomechanical properties by tensile testing. Among others, the parameters of ultimate load and stiffness were collected. Native tendons served as controls. A formula was derived to quantify the relation between tendon overlap and ultimate load. We observed that sufficient tensile strength (mean ultimate load of 217 N) is already given with a 2 cm tendon overlap. In addition, with more than 3 cm overlap length only little additional tensile strength is to be expected as the calculated ultimate load of 4 cm overlap (397 N) is approaching the plateau of the maximal ultimate load of 435 N (native tendons).
Biomechanics
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One of the most important design approaches in the repairing/strengthening details is using CFRP (Carbon Fiber Reinforced Polymer) to delay the debonding of the CFRP strips/plates from the surface to take full advantage of the CFRP reinforcement. Compared to non-anchored strips, research studies regarding bond-slip models developed for fan type CFRP anchors and anchored CFRP strips to strengthen details are limited in the related literature review. However, in studies on this subject, anchors are placed at 90° to the axial tensile force applied to the CFRP strips. The ultimate load-bearing capacity and bond-slip models of CFRP strips with the different angled CFRP fan type anchor under axial tensile force have not been found in the literature review. Within the study's scope, 28 angled CFRP strip test specimens were produced and then tested under the effect of monotonically increasing axial tensile force with an experimental setup designed by the authors. The variables examined in this study were the concrete compressive power, the CFRP strip's width, the number of the CFRP anchor fan type, and the angle of the anchor placed on the CFRP strip. As a result of the study, an equation was proposed for calculating the ultimate load-bearing capacity of angled anchored CFRP strips and angled anchored CFRP strips. Finally, a new proposal for the bond-slip model was developed. It is thought that the new interface bond-slip model developed for CFRP strips with different angles will make an important contribution to the literature. It can be used in finite element analysis to realistically analyze the capacities and load-displacement behavior of reinforced concrete structural elements by strengthening such strips.
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The performance of fiber reinforced polymer (FRP) composites at high temperatures is a serious concern that needs investigation before the incorporation of these composites into important engineering structures. This article presents an experimental study on the tensile properties of carbon fiber reinforced polymer (CFRP) sheets, hybrid carbon/glass fiber reinforced polymer (C/GFRP) sheets and hybrid carbon/basalt fiber reinforced polymer (C/BFRP) sheets at different temperatures. The specimens of FRP sheets were tested at temperatures ranging from 16 to 200°C, while corresponding dry fiber sheets (without resin impregnation) were tested at 16°C as a reference. The test results show that the tensile strength of carbon fibers in different FRP sheets decreases significantly with increasing temperature, and remains almost stable at an ultimate value (3000 MPa) after the polymer exceeds its glass transition temperature (T g ), which is higher than the tensile strength of the non-impregnated fiber sheets at room temperature. At elevated temperatures, the hybridization of fibers can reduce the scatter of the tensile strengths of CFRP composites. Additionally, the tensile strength of CFRP sheets with different dimensions is significantly different, but size dependence is independent of temperature. Furthermore, elevated temperature also influences the failure modes of FRP composites.
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A total of 9 pieces of unstrengthened and strengthened two-way reinforced concrete(RC)slabs were tested under the concentrated load.The failure types and mechanical properties of the specimens bonded external Carbon Fiber Reinforced Polymer(CFRP),steel strips or CFRP and steel combined strips were investigated.The influences of the different reinforcement methods,the dosage of CFRP and strip spacing on the cracking load,ultimate strength,stiffness and ductility were analyzed.The test results indicated that strengthening two-way RC slabs with CFRP and steel combined strips was effective in greatly improving the cracking load,the ultimate load capacity and the bending stiffness.The combination strengthening slabs also behave well ductility.In a certain range,with the dosage of CFRP increasing,the combination strengthening slabs showed an increasing trend in the ultimate load capacity and bending stiffness,while had a decreasing trend in ductility.With the strip spacing increasing,the combination strengthening slabs had a decreasing trend in cracking load and ductility,while had no change on bending stiffness.
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