On Improved Seismic Brace considering Rehabilitation of Safe Shelter

在基于性能的抗震设计中，本研究提出了一种强度、屈服后的塑性变形能力和地震荷载作用下的能量吸收能力都可以很容易地评估的支撑。拟议的支撑包括一个细长的杆，两端是张力连接的，包括一个斜面垫圈和楔形垫圈。支架中不会发生弯曲。为了验证楔体的作用机理和性能，对一个单层托架进行了水平加载试验。加载试验和振动台试验的结果和结论如下：(1)楔体的滑移位移达到最大时，存在完美的弹塑性滞回现象；(2)层剪应力；强度和吸能能力易于评估。(3)地震后的塑性变形能力可以通过校核楔体的总滑动位移来评估。(4)这种支撑可以很容易地实现基于性能的设计。

This research proposes a brace whose strength, plastic deformation capacity remaining after yield and energy absorption capacity under seismic loading can be easily evaluated for performance-based seismic design. The proposed brace consists of a slender rod with tensile-connected ends incorporating a beveled washer and wedge. There is no buckling in the brace. The wedge slides between a washer and stand so as to prevent brace looseness due to axial plastic deformation under repeated loading.To verify the brace's mechanism and performance, repeated horizontal loading tests were performed on a one-story bay frame with a tensile-connected brace having a wedge device.Results and conclusions obtained from the loading tests and shaking table tests are summarized as follows.(1)Perfect elasto-plastic hysteresis was observed until the wedge's sliding displacement reached its maximum.(2)Story shear stress, strength and energy absorption capacity were easily evaluated.(3)Plastic deformation capacity remaining after an earthquake can be evaluated by checking the wedge's total sliding displacement.(4)Performance-based design can be easily achieved with this brace.