Connections Of Shear Walls In Modern Bamboo-wood Structures-Theoretical Analysis And Experimental Study

The capacity of wood frame shear walls is mainly governed by thecharacteristics of the sheathing-to-framing connections, while the use of hold-downanchors also has effect on the mechanical model of shear walls. In this paper, theperformance of connections (sheathing-to-framing connections and hold-downconnections) and the lateral resistance of light-weigh wood frame shear walls withply-bamboo sheathing panels were conducted based on theoretical analysis,experimental research and finite element analysis.Firstly, this thesis established the bearing capacity formula of thesheathing-to-framing connection and the regression models of basic variables whichinfluenced the properties of connections through theoretical analysis. Connections of6d nails and staple nails were tested under monotonic and cyclic loading programs.The results showed that the angle between the loading direction and the grain of theframe had a significant effect on the strength and stiffness degradation after yieldingof the connections; comparing to staple nails,6d nail specimens loaded parallel tograin showed better bearing capacity and ductility, but the hysteretic capacity waslower; the comparison of the experimental results and theoretical analysis showed theaccuracy and applicability of the bearing capacity formula.Secondly, the bearing capacity of the hold-down connection was considered asthe embedding strength parallel to the grain for bolts by the simplified analysis model.The test results also showed the accuracy of this model.Thirdly, by the mechanical model of the fully anchored shear wall, bearingcapacity of the wall was mainly determined by the sheathing-to-framing connectionson the bottom edge of the wall. Twelve shear walls of two types of nails (6d nails andstaple nails) were respectively conducted under monotonic and cyclic loads, testresults indicated that6d nail walls had better ductility than that of staple nail walls,while the hysteretic behavior was similar; the increase of nail spacing on the center ofthe wall had no significant effect on the bearing capacity, but to some extent, couldimprove the ductility.Finally, a shear wall model was established in SAP2000, the multi-linear plasticelement was used to simulate the sheathing-to-framing connection, and the hystereticmodel of the connection used the Pivot model, finite element analysis were similar to the results from tests.