基于能量平衡的含减震外挂墙板钢筋混凝土框架结构的设计方法研究

STUDY ON ASEISMIC DESIGN OF RC FRAME STRUCTURE WITH ENERGY DISSIPATIVE OUTDOOR-WALL CLADDING PANELS BASED ON ENERGY EQUILIBRIUM

含减震外挂墙板钢筋混凝土框架结构在墙板与主体结构间引入U形钢板消能器,可有效利用两者间的相对水平变形耗散地震能量,从而提高结构的抗震性能。该新型结构通过合理的性能化设计,可以使得作为预期损伤部位的U型钢板消能器和框架梁、柱端塑性铰在设防烈度地震和罕遇地震下先后屈服耗散地震能量,使主体结构在设防烈度地震下保持弹性,罕遇地震下保持低损伤,从而具有良好的韧性。在已有研究的基础上,提出了适用于该种结构的基于能量平衡的实用抗震设计方法。采用该方法,设计了一栋8层含减震外挂墙板钢筋混凝土框架结构,并对其进行设防烈度地震和罕遇地震下的弹塑性时程分析。结果表明:所设计结构能够实现不同水准地震作用下的预期性能目标,该设计方法具有合理性和可行性。

The reinforced concrete(RC)frame structure with energy-dissipative outdoor-wall cladding panels(EDCP)is a new kind of structural system,in which the U-shaped steel dampers(USDs)are used to connect the cladding panels and the frame structure.The USDs can utilize the relative slip between the panels and frame to dissipate seismic energy,and thus enhance the aseismic performance of structure.The USDs and plastic hinges of beams and columns can successively yield and dissipate seismic energy under the action of fortification and rare earthquakes through rational performance-based design,which means that the main structure can remain elastic under earthquakes and low-damage under rare earthquakes,and thus has a satisfactory resilience.An energy equilibrium-based practical seismic design procedure was proposed for such structure based on the previous study,and the procedure was used to design an 8-story RC frame structure with energy-dissipative outdoor-wall cladding panels.Moreover,nonlinear time-history analysis under the action of fortification or rare earthquakes were conducted to verify the aseismic performance of the structure.The results indicated that the structure could achieve the expected performance objectives under the action of different earthquake intensities and the proposed design procedure was reasonable and feasible.