构造柱约束的混凝土小砌块墙体抗震性能的试验研究

通过对4片不同构造形式的混凝土小砌块足尺墙片在低周反复荷载作用下的恢复力试验,观测墙体在荷载作用下开裂和破坏的发展过程,研究了不同构造措施和不同结构类型的墙体的破坏形态、钢筋应变及墙体变形能力,得到墙体的开裂荷载和极限荷载。试验表明:墙体的开裂位移非常小,即使墙体能承受较大的水平荷载也很容易开裂;构造柱约束小砌块墙体能有效地提高墙体的承载力和抗震性能,增强变形能力,防止开洞墙体的脆性破坏;加水平钢丝网片和配筋带可以进一步提高墙体的延性。试验还表明墙体在开洞后极限承载力下降较多,需要有相应的加强措施,以提高其延性和抗震能力。

An experimental study on the seismic behavior of small concrete block walls confined by tie columns and beams

In order to study the failure mode,seismic behavior and deformation capacity,four full-size small concrete block walls with different structural details are tested under low cyclic loadings.Based on the laboratory experiment,the cracking and damage process of the walls are studied and the initial cracking load and the ultimate load for the walls are determined.The strain of the reinforcing bars are recorded and analyzed.The test results indicate that the walls are easy to crack even if they can take rather large horizontal loads.Tie steel fabric sheets and columns can improve the seismic behavior,and enhance deformation capacity to prevent brittle failure of walls with openings on them.The ultimate loads of the walls are reduced because of the door holes,and strengthening measures should be taken in order to improve the ductility and earthquake resistance capacity.