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（太原理工大學(xué)建筑與土木工程學(xué)院，太原 030024）

［摘要］為了研究鋼管與螺栓球組合試件超低周疲勞性能，設(shè)計(jì)了兩端帶螺栓球節(jié)點(diǎn)的管球組合試件模型。對(duì)三種管球組合試件進(jìn)行了大位移循環(huán)加載試驗(yàn)，試驗(yàn)過(guò)程中觀察試件中部塑性變形區(qū)域彎曲、凹陷、開(kāi)裂的發(fā)展歷程及最終破壞形態(tài)；通過(guò)對(duì)試驗(yàn)數(shù)據(jù)的合理分析，研究三種組合試件的滯回曲線、骨架曲線、剛度退化、滯回耗能性能等超低周疲勞性能。試驗(yàn)結(jié)果表明：三種不同螺栓規(guī)格與鋼管規(guī)格的組合試件，鋼管塑性鉸的破壞歷程與破壞形態(tài)都大致相仿，均經(jīng)歷彎曲、凹陷、裂紋、開(kāi)口破壞的過(guò)程，開(kāi)口破壞時(shí)塑性鉸區(qū)域呈橢圓形；每一次循環(huán)加載力卸載為零時(shí)鋼管均出現(xiàn)一定程度的殘余變形，這種變形隨著持續(xù)的循環(huán)加載而不斷累積，呈增長(zhǎng)趨勢(shì)；不同螺栓的組合試件對(duì)骨架曲線非線性起點(diǎn)的承載力影響不大，但對(duì)極限承載力有影響；試件塑性鉸凹陷時(shí)剛度急劇下降，破壞前壓荷載下其剛度基本一致，分別為1.80，1.75，1.85。

［關(guān)鍵詞］螺栓球網(wǎng)格結(jié)構(gòu)；超低周疲勞試驗(yàn)；塑性鉸；骨架曲線；滯回曲線

中圖分類號(hào)：TU399文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)24-0019-05

Experimental research on ultra-low cyclical fatigue of  steel pipe and bolt ball combined specimens

ZHANG Jie, QIAO Yongqiang, LI Haiwang, SONG Xiayun

(College of Architecture and Civil Engineering, Taiyuan  University of Technology, Taiyuan 030024, China)

Abstract:In order to study the ultra-low cyclical fatigue performance of steel pipe and bolt ball combined specimens, a pipe-ball combined specimen model with bolt ball joints at both ends was designed. The large displacement cyclic loading test was carried out on the three kinds of pipe-ball combined specimens. During the experiment, the development process of bending, dent, cracking and the final failure form in the middle of the specimen was observed; through reasonable analysis of the test data, the ultra-low cycle fatigue performance of the three combined specimens, such as hysteresis curve, skeleton curve, stiffness degradation, and hysteretic energy dissipation performance, were studied. The test results show that for three combined specimens of different bolt specifications and steel pipe specifications，the breaking process and breaking pattern of the plastic hinge of the steel pipe are roughly the same, and they all undergo the process of bending, dent, cracking, and opening destruction, when the opening breaks, the plastic hinge area presents an elliptical shape; each time the cycle loading force is unloaded to zero, the steel pipe shows a certain degree of residual deformation, this deformation accumulates continuously with continuous cyclic loading, which presents an increasing trend; the combined specimens of different bolts have little effect on the bearing capacity of the nonlinear starting point of the skeleton curve, but has an influence on ultimate bearing capacity; the stiffness of the plastic hinge of the specimen decreases sharply when it is depressed, the stiffness under the compressive load before breaking is basically the same, which are 1.80, 1.75, 1.85.

Keywords:bolt ball grid structure; ultra-low cycle fatigue test; plastic hinge; skeleton curve； hysteresis curve

*國(guó)家自然科學(xué)基金項(xiàng)目（51578358）。

作者簡(jiǎn)介：張潔，博士研究生，Email:mayzj@126.com；通信作者：李海旺，博士，教授，博士生導(dǎo)師，Email: Ihwtut@126.com。