CFRP筋鋼筋混凝土剪力墻自復(fù)位性能試驗研究

趙軍 趙齊 陳紀偉

摘要：通過對1片鋼筋混凝土剪力墻和4片配有碳纖維增強聚合物（CFRP）筋的剪力墻的低周反復(fù)荷載試驗，在分析試驗中測得的裂縫寬度、裂縫的發(fā)展和分布形態(tài)、側(cè)向變形的基礎(chǔ)上，研究了在鋼筋混凝土剪力墻的適當(dāng)位置部分或全部配置CFRP筋對剪力墻的殘余裂縫和殘余變形等自復(fù)位性能的影響規(guī)律。研究結(jié)果表明：與普通鋼筋混凝土剪力墻相比，配有CFRP筋的剪力墻的開裂荷載較低，裂縫較多，裂縫分布分布范圍較廣，墻體的最大裂縫寬度、殘余裂縫寬度和側(cè)向殘余變形分別降低了60%、70%和90%，說明在剪力墻中合理配置CFRP筋能使剪力墻具有優(yōu)異的自復(fù)位性能。

關(guān)鍵詞：剪力墻；碳纖維增強聚合物筋；自復(fù)位；裂縫寬度；殘余裂縫；殘余變形

中圖分類號：TU352

文獻標(biāo)志碼：A 文章編號：1674-4764（2016）03-0018-07

Abstract：One shear wall totally reinforced with steel bars and the other four shear walls partly or totally reinforced by CFRP bars in the longitudinal direction were tested under the reversed cyclic loading. Based on the analysis of the crack width， crack distribution and lateral deformation of the five shear walls， the influence rules of the reinforcement methods of partly or totally reinforced by CFRP bars on the self-centering performance such as residual crack and residual deformation of reinforced concrete shear walls were researched. The results showed that the crack loads of the shear walls with CFRP bars were lower than that of reinforced concrete shear wall. The shear walls with CFRP bars had more cracks and more extensive crack distribution. The maximum crack widths， residual crack widths and residual deformations decreased by 60%， 70%， and 90%， respectively， which indicated the shear walls reinforced by CFRP bars had excellent self-centering performance.

Keywords：shear wall；CFRP bar；self-centering；crack width；residual crack；residual deformation

鋼筋混凝土剪力墻是高層建筑中常用的抗側(cè)力構(gòu)件，其力學(xué)性能對整體結(jié)構(gòu)的抗震性能至關(guān)重要。目前，中國高層建筑結(jié)構(gòu)抗震設(shè)計遵循“小震不壞、中震可修、大震不倒”的原則，由于地震作用具有明顯的不確定性，結(jié)構(gòu)在地震作用下的受力情況也比較復(fù)雜，結(jié)構(gòu)的抗震設(shè)計仍然不夠完善。按照現(xiàn)行設(shè)計規(guī)范設(shè)計的房屋建筑在遭遇罕遇地震后雖然主體結(jié)構(gòu)不會發(fā)生倒塌造成大量的人員傷亡，但結(jié)構(gòu)在強烈的地震作用下必然會產(chǎn)生一定程度的損傷[1-2]。長期以來，中國在剪力墻結(jié)構(gòu)設(shè)計時，要求剪力墻具有良好的變形能力，使結(jié)構(gòu)在遭受地震作用時，通過產(chǎn)生足夠的變形來提高其抗震能力?！?br>