Steel reinforcing, dynamic

The allowable strength of materials is higher under dynamic loads, which produce high strain rates, than under static loads. This results in higher resistance to dynamic loads. The most important increases are in the compression strength of concrete and the yield strength of the steel reinforcement. 

Dynamic Strength. The dynamic design strengths for steel reinforcing and concrete are equal to their static design strengths times the appropriate Dynamic Increase Factor (DIF). 

Static wick test results on a wickproof steel cord reinforced neoprene rubber fabric for sonar dome rubber windows (SDRWs) on US navy vessels are presented. A dynamic water wicking test was developed to model actual operating conditions of the SDRWs. All fabric samples believed to be wickproof failed this test. The effects of mechanical flexure on other mechanical properties of steel reinforced rubber fabric are discussed. 11 refs. 

This chapter provides material properties and response criteria necessary to design facilities constructed of reinforced concrete, reinforced masonry, structural stcc and cold formed steel. Static and dynamic properties are covered for the materials used in these facilities. Allowable response criteria are covered for both... 

Values for dynamic increase factors are presented in a variety of references although most are based on the same data source. Additional data has been produced in various test programs but has not been assembled into a central source. Much of the data that has been published is based on high strain rate tests and many of the recommended values are arbitrarily chosen. Table 5.A.1 provides recommended DIFs for reinforced concrete and masonry and Tabic 5.A.2 contains values for structural steel, cold-formed steel and aluminum. 

Biofilm study was carried out in the drinking water supply system DWSS"Yovkovtsy , that supply with water the region of Veliko Tamovo, and in the laboratory model of water distribution system. Some experiments were performed 1) to determine microbiological composition of biofilm samples scraped from mild steel or reinforced concrete s main pipe line and concrete tank of DWSS Yovkovtsy 2) to study biofilm formation process on test pipe from PVC, PE, stainless steel and carbon steel in a laboratory model of drinking water distribution system under flow velocity 0,006 cm/s. 3) to study dynamics of biofilm formation process on polypropylene, the pipe material used during the last years in Bulgaria, in a model water distribution system under flow velocities 0.3 m/s, 0.5 m/s, 0.7 m/s and 1 m/s. 

The test results show that the RPC possesses high bond strength, dynamic modulus, and bond durability as compared with other concretes. The adhesion between the RPC and the steel is also much greater than that for the other concretes. It would be interesting to verify the consequences of this improved adhesion in reinforced concrete structures. 

The neutralization of concrete leads to reduction of the corrosion protective function of concrete against reinforcing steel, and has an important influence on the durability of reinforced concrete structures. The neutralization is influenced by various factors (concentration of CO2 gas, type of concrete, water-to-cement ratio(W/C), water content, type of finishes and their thickness and permeability, temperature and humidity conditions, etc.). From the physicochemical point of view, this process can be considered to be the diffusion of CO2 inwards into concrete from the surface, accompanied by the conversion of Ca(0H)2 into CaC03. In this context, -unsteady state dynamics has been done for the progress of neutralization of concrete in order to rationally understand the process and the influence of finishes on the process (, . ... 

Huettner [141] discusses the role of carbon fiber composites in state-of-the-art ceramics in surgery, such as reinforced carbon shaft endoprosthesis, and finds that cfrp is suitable for the construction of endoprosthesis shafts having high static and dynamic strength. Claes [142] describes experimental investigations on hip prostheses with carbon fiber reinforced carbon shafts with ceramic heads, finding cfrp more suitable than stainless steel. 

In this study, six-story piloti reinforced concrete (RC) frames are experimentally tested, in order to examine the effectiveness of steel dampers in reducing the structural damage. Two sets of structural models are compared to each other through substructure pseudo-dynamic tests. 

Generic Safety Issue (GSI) B-05 in NUREG-0933 (Reference 1), identifies two concerns relating to containment design. First, that sufficient information is not available to predict the behavior of two-way reinforced concrete slabs and second, that the structural design of a steel containment vessel subjected to unsymmetrical dynamic loadings may be governed by the instability of the shell. 

Recent developments of plastic stents have aimed to improve the resistance of plastic stents to external compression forces. Therefore, metal has been incorporated into the plastic material of the stent. One of the latest developments is the dynamic bifurcation stent made of silicone (Freitag et al. 1994). This Dynamic stent (Riisch, Kernen, Germany) is reinforced with horseshoe-shaped steel struts. A posteriorly located flexible membrane allows dynamic compression of the stent during coughing, whereas the steel struts prevent airway compression from external forces. Theoretically, this stent mimics the mechanical dynamics of the normal trachea. The distal end is a Y shape which rides on the carina to prevent distal migration. 

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