EARTHQUAKE RESPONSE BEHAVIOR ON STEEL FRAME WITH PARTIAL-STRENGTH CONNECTIONS AND COLUMN BASE DEFORMATION

为了准确评价结构自密实钢柱试件的抗震性能，进行了自振、强迫振动试验和地震监测。利用天然地震时的反应监测记录，对试件的振动特性进行了识别。辨识出的系统增益近似为线性单自由度系统的理论增益，基于该线性单自由度系统计算的响应与实测响应吻合较好。对外露式钢柱脚进行了双向低周反复静力受弯试验。对19 mm和9 mm厚的端板连接冷弯方钢管柱进行了单轴、双轴线性和双轴循环荷载作用下不同破坏形式（锚栓屈服型和底板屈服型）的试验。滞回线形状、弯矩承载力（包括双轴相互作用面）和旋转承载力 ...更多信息 城市进行了实验研究。此外，为了考虑部分强度连接中x轴和y轴弯矩的相互作用，提出了两种不同的多弹簧模型：底板屈服型和锚屈服型。为了更好地反映露肢柱脚的非线性性能，将露肢柱脚简化为一种部分强度连接，以便于设计过程中更好地反映露肢柱脚的非线性性能。根据以往试验的测试结果，提出了一种表征外露式柱脚弯矩-偏角转动关系的典型折线。同时，针对锚栓屈服型和底板屈服型，提出了将单轴恢复力特征模型扩展为双轴模型来模拟柱脚在双向受弯情况下的弹塑性性能的方法。少

To estimate the seismic behavior of the SHS steel column specimen of structure with accuracy, free vibration, forced vibration tests, and earthquake monitoring were carried out. The response records monitored during natural earthquakes were used to identify the vibration property of the specimen. Identified system gain was approximated by a theoretical gain of linear SDOF system, and the response calculated based on such a linear SDOF system agrees with the monitored response fairly well. A series of test, which is performed on exposed-type steel column bases under static cyclic bi-axial bending, is carried out. Cold-formed square-tube columns with end-plate type connection specimens (19mm and 9mm thickness) with different failure types, anchor bolt yielding type and base plate yielding type, were tested under uni-axial, bi-axial but linear, and bi-axial circular cyclic loading programs. Shape of hysteresis loop, moment capacity including bi-axial interaction surface, and rotation capa … More city are examined experimentally. Moreover, to consider the interaction between the x-axis and y-axis bending moment in a partial-strength connection, we propose two different multi-spring models : one is base plate yielding type and the other is anchor bolt yielding type. In addition, efficiency of the proposed model is examined by comparing it with the test results.In order to reflect the nonlinear behavior of an exposed-type column base to design procedure, the exposed-type column base is modeled as a kind of the partial strength connection. From the test results of the experiments conducted in the past, a typical poly-line to characterize moment vs. drift angle rotation relationship of exposed-type column base is proposed. Also, a method to simulate the inelastic behavior of column base in case of biaxial bending by expanding uni-axial restoring force characteristic model to bi-axial model is proposed, with respect to anchor bolt yielding type and base plate yielding type, respectively. Less