Effect of vertical load under cyclic lateral load test for evaluating sugi CLT wall panel

Abstract

Structural performance of shear walls to resist against wind and seismic loading is evaluated by applying static or cyclic load testing. IS021581 specifies the static and cyclic lateral load test for shear wall. ISO defines two method of lateral load test. Method 1 shows the boundary conditions are designed to produce mainly the shear response of the wall. Method 2 shows the boundary conditions are designed to produce mainly the rocking (rigid body rotation of the wall) or combined shear-rocking response of the wall reflecting the intended actual construction details of joints connecting the wall to bottom and top boundaries. Cross Laminated Timber panels (also known as CLT or X-LAM) are relatively new building material and high rigidity and strength compared to sheathing materials. It is possible to apply to low-rise residential buildings from the multi-story timber buildings. In Japan manufacturer has been already trying to produce Sugi CLT. Sugi (Cryptomeria japonica) is most popular softwood in Japan. In this report shows effect of vertical load based on IS021581 method 2 under cyclic lateral load test of Sugi CLT. Vertical load applied three condition, 15kN/m, 30kN/m and without vertical load. Stiffness of CLT wall panel against horizontal load shows higher on vertical load. However maximum strength increase due to vertical load was smaller than the stiffness.