Experimental Research on Mechanical Properties of Sandwich Wall Panels with Bamboo Shear Connection

2012 ◽  
Vol 166-169 ◽  
pp. 914-918
Author(s):  
Meng Wang

Sandwich wall panels are often used as non-bearing structure and just need to bear lateral wind load. Steel truss is normally used as the shear connectors in the wall panels. Traditional steel connectors are poor thermal insulators and heat is easily been transfer through them. As a result, they lead to enormous energy lose. In order to improve the energy efficiency, composite bamboo connectors, which are ideal thermal insulators, are used to replace steel ones. In this experiment, three full-size models of composite sandwich wall panels were built and their displacement, surface strain, crack load, as well as ultimate strength were determined. Experimental results shows that wall panels with bamboo connection has a relatively better mechanical property than traditional ones.

2016 ◽  
Vol 23 (1) ◽  
pp. 105-112 ◽  
Author(s):  
Josef MACHACEK ◽  
Martin CHARVAT

Longitudinal shear flow in the connection of a bridge steel truss upper chord and a concrete bridge slab is studied both in elastic and plastic stages of loading up to the shear connection collapse. First the distribution of the shear flow with an increasing level of loading is shown as resulted from 3D MNA (materially nonlinear analysis) using ANSYS software package and a former experimental verification. Nevertheless, the flow peaks in elastic stages above truss nodes due to local transfer of forces are crucial for design of the shear connection in bridges. Therefore a simple approximate 2D elastic frame modelling was suggested for subsequent extensive parametric studies. The study covers various loadings including the design loading of bridges and demonstrates importance of rigidity of the shear connec­tion, rigidity of an upper steel truss chord and rigidity of a concrete deck. Temperature effects and a creep of concrete are also studied. The substantial part of the study deals also with concentration of shear connectors in the area of steel truss nodes and influence of the connector densification on distribution of the longitudinal shear along an interface of the steel truss chord and the concrete deck. Eurocode 4 approach and quest to find an optimum design of the shear connection in composite bridge trusses are discussed. Finally the resulting recommendations for a practical design are presented.


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