单箱双室耗能支撑钢框架的抗震性能分析

针对既有钢框架结构存在承载力、抗震性能不足等问题,设计了双钢管混凝土缀板耗能支撑和单箱双室耗能支撑,利用ABAQUS软件在同样的位移荷载下计算出来的滞回耗能曲线,证明单箱双室耗能支撑,不仅能简化施工工序,还能具有比双钢管混凝土缀板耗能支撑优越的耗能能力。在此基础上采用SAP2000软件分别建立普通中心支撑框架和单箱双室耗能支撑框架两种结构模型,对其在地震响应中的基底剪力、位移、加速度、支撑轴力和支撑滞回曲线进行对比分析。研究表明:单箱双室耗能支撑对钢框架的耗能减震效果显著。

型钢螺栓连接装配式半刚性梁柱节点弯矩与转角关系研究

现阶段,新型装配式混凝土梁柱节点的设计与其力学抗震性能的研究是预制装配式混凝土结构的研究热点,但关于预制装配式混凝土梁柱节点的半刚性力学性能研究较少。基于有限元软件ABAQUS对型钢螺栓连接梁柱节点及设计12个可能影响节点弯矩-转角曲线因素的试件进行有限元分析,得到节点与试件的弯矩-转角曲线,通过曲线进一步分析节点的半刚性系数与其他半刚性力学性能。

碟型弹簧应用“零保温”淬火工艺的研究

本文通过实验室及工业试验，分析、验证了６０Ｓ１２Ｍｎ钢制的Φ１４０×Φ７０．８×５×９型碟到弹簧应用“零保温”淬火工艺的可行性．在工业试验过程中．提出了通过测量电阴炉恒温后的通电时间来绘制该炉的耗能曲线，从而确定工件的“零保温点”的方法．实践证明这种方法是行之有效的，易于推广．

预应力混合装配式混凝土框架新型节点抗震性能模拟分析

提出一种预应力混合装配式混凝土框架新型节点,利用ABAQUS软件建立1个现浇节点模型、1个预应力直接装配式节点模型和6个预应力混合装配式节点模型,在验证建模方法可靠的基础上,对不同模型进行低周反复荷载下滞回曲线、耗能能力、骨架曲线、延性和刚度退化的对比研究,并分析混凝土强度、耗能角钢强度和厚度对新型节点抗震性能的影响。结果表明,预应力混合装配式混凝土框架新型节点的抗震性能较预应力直接装配式节点有大幅度提升,耗能性能和承载力略低于现浇节点,延性和刚度高于现浇节点;预应力混合装配式混凝土框架新型节点的耗能能力和承载力随预制混凝土梁强度提高而提高,但延性有所下降;提高耗能角钢强度能提高承载力极限和延性,但对耗能性能影响较小;增大耗能钢板厚度能有效提高抗震性能。

Seismic performance of double- skin steel- concrete composite box piers: Part Ⅰ——Bidirectional quasi-static testing

To study the seismic performance of double-skin steelconcrete composite box（ DSCB） piers, a total of 11 DSCB pier specimens were tested under bidirectional cyclic loading. The effects of the loading pattern, the steel plate thickness, the axial load ratio, the slenderness ratio and the aspect ratio were taken into consideration. The damage evolution process and failure modes of the tested specimens are presented in detail. Test results are also discussed in terms of the hysteretic curve, skeleton curve, ductility and energy dissipation capacity of DSCB pier specimens. It can be concluded that the hysteretic performance of DSCB piers in one direction is affected and weakened by the cyclic loading in the other direction. DSCB piers under bidirectional cyclic loading exhibit good performance in terms of load carrying capacity, ductility, and energy dissipation capacity. Overall, DSCB piers can meet the basic aseismic requirements. The research results can be taken as a reference for using DSCB piers as high piers in bridges in strong earthquakeprone areas.

Seismic behaviors of steel reinforced ECC/RC composite columns under low-cyclic loading

To improve the seismic performance of columns, engineered cementitious composite （ECC） is introduced to partially substitute concrete at the base of the columns to form ECC,/reinforced concrete （ RC） composite columns. The mechanical behaviors of the ECC/RC composite columns are numerically studied under low-cyclic loading with the finite element analysis softwareof MSC. MARC. It is found that the ECC/RC composite columns can significantly enhance the load capacity, the ductility ad energy dissipation of columns. Then, the effects of the height of the ECC, the axial compression ratio and the longitudinal reinforcement ratio on the seismic behaviors of the composite columns are parametrically studied. The results show that the ECC/RC composite column with a height of the ECC layer of 0. Sh（h is the height to the cross-section） can achieve similar seismic performance of a full ECC column. The peak load of the composite column increases significantly while the ductility decreases with the increase of the axial compression ratio. Increasing the longitudinal reinforcement ratio within a certain range can improve the ductility and energy dissipation capacity and almost has no effect on load capacity. The aalysis results ae instructive and valuable for reference in designing ECC structures.

Segmentation of electricity market for households in Slovenia

This paper investigates the electricity market for households in Slovenia. The focus is on the investigation of some empirical facts in the Slovenian electricity market for households focusing on market segmentation, market concentration measures, real electricity price developments, and their implications for electrical energy consumption and consumer welfare. The authors apply descriptive statistics, Lorenz curve and Gini coefficient of concentration, and demand function using regression framework on time-series data. The authors found that the market liberalization and entry of new competitors have slightly caused variations in the patterns in real electricity price developments. Households＇ real income and real electricity prices for households are found as the crucial determinants for the electrical energy demands by households.

钢筋混凝土桥墩塑性损伤试验研究

对4种不同配筋率和配箍形式的大尺寸钢筋混凝土桥墩进行低周反复试验。结果显示:不同损伤阶段对滞回曲线、耗能能力以及承载力的影响不同。混凝土保护层剥落、纵向钢筋的压屈可以作为各桥墩承载力下降和耗能能力下降的特征现象。对比构件的保护层混凝土剥落范围以及塑性曲率分布范围,提出等效塑性铰长度的建议式。