Experimental research on seismic performance of BRB concrete frames
Experimental research on seismic performance of BRB concrete frames
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发表时间：
2011
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通讯作者：
Wu Na
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作者：
Wu Na
设计、制作了3种不同截面形式的防屈曲支撑混凝土框架（普通钢筋混凝土梁-单斜支撑、扁梁-单斜支撑、普通钢筋混凝土梁-倒V型支撑），并进行了拟静力试验，研究了3种不同截面形式的防屈曲支撑混凝土框架的抗震性能，包括混凝土构件裂缝、侧向荷载-位移曲线、骨架曲线、切线刚度及其退化、防屈曲支撑荷载-变形曲线等。试验结果表明：防屈曲支撑与混凝土框架能有效地共同抵抗侧向力，体系的荷载-位移曲线饱满、稳定，在较小的层间位移比时，防屈曲支撑能开始屈服耗能，在较大的侧移比时，防屈曲支撑能避免破坏，从而提高了结构的等效粘滞阻尼，降低了结构的地震反应，设计的混凝土节点、预埋件和连接件功能良好、可靠。
Three buckling-restrained brace concrete frames(BRBCF) with different BRB or beam sections,which were normal reinforced concrete beam with monoclinic BRB,flat beam with monoclinic BRB,normal reinforced concrete beam with invert-V BRB,were designed,manufactured and tested by quasi-static test.The seismic performance,including cracks on concrete elements,lateral load-displacement loops,skeleton curves,tangent stiffness and its degradation,and BRB load-deformation curves,were studied.Test results show that the BRB and concrete frame can effectively work together to resist lateral force.The system has plump and stable hysteric load-displacement curves.The BRB can start to dissipate energy by yielding at relatively small story drift ratio,and avoid failure at large lateral drift ratio.It is validated that the equivalent viscous damping can thus be increased and the seismic response be reduced,resulting in an improved structural performance.The designed concrete joints,the embedded parts and the connectors function well and reliably.