桩基静载试验之钢铰线锚杆横梁反力装置测试技术的研究与应用     

李广平  徐天平  吴伟衡  李浩年  毛良基 《岩土力学》2003,(Z1)

依据《建筑桩基技术规范》[1](JGJ94-94)和美国《桩基轴向抗压静载标准试验方法》[2](ASTMD1143),探讨了桩基静载试验之钢铰线锚杆横梁反力装置的测试技术,并成功的解决了某外资工地桩基静载试验的技术难题。  相似文献   

TGY系列钢筋混凝土液压破碎钳的研制     

宋殿兰 《探矿工程》2003,30(6):29-30

根据墙体的厚度与破碎力的大小，利用优化设计与等强度原理，设计了钳体与钳口韵合理结构，计算了液压系统的流量与压力；通过计算机模拟，确定了液压系统执行机构的结构与性能参数。设计的TGY系列液压破碎钳在钢筋混凝土结构改造与拆除工程中应用取得了较好效果。  相似文献   

Seismic performance evaluation of steel arch bridges against major earthquakes. Part 2: simplified verification procedure     

Zhihao Lu  Tsutomu Usami  Hanbin Ge 《地震工程与结构动力学》2004,33(14):1355-1372

The performance‐based philosophy has been accepted as a more reasonable design concept for engineering structures. For this purpose, capacity evaluation and demand prediction procedures for civil engineering structures under earthquake excitations are of great significance. This work presents a displacement‐based seismic performance verification procedure including capacity and seismic demand predictions for steel arch bridges and investigates its applicability. Pushover analyses is employed as a basis in this method to investigate the structure's behaviors. A failure criterion for steel members accounting for the effect of local buckling is involved and an equivalent single‐degree‐of‐freedom (ESDOF) system with a simplified bilinear hysteretic model formulated using pushover analyses results is introduced to estimate the displacement capacity and maximum demand of steel arch bridges under major earthquakes. To check the accuracy of the proposed method, seismic capacities and demands from multi‐degree‐of‐freedom (MDOF) time‐history analyses with Level‐II design earthquake record inputs modeling major earthquakes are used as benchmarks for comparison. By a case study, it is clarified that the proposed prediction procedure can give accurate estimations of displacement capacities and demands of the steel arch bridge in the transverse direction, while insufficient for the longitudinal direction, which confirms the conclusion drawn in other structure types about the applicability of pushover analyses. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

钢模台车油缸式行走装置的设计          下载免费PDF全文

方德平  赵志航 《探矿工程》2004,31(12):26-27

钢模台车传统的链条式行走装置易发生故障，而且经常耽误生产。利用油缸推动原理设计的油缸式行走装置，经在本溪市三架岭公路隧道的1年使用，证明其能够满足钢模台车行走的要求，未发生一次故障，说明油缸式行走装置是可行的，而且可靠性好。  相似文献   

钻杆接头材料激光相变硬化层的组织和硬度研究          下载免费PDF全文

刘丽  吴东江  孙友宏  李守春  庄娟 《探矿工程》2002,(6):17-19

采用功率为2kW、扫描速度为100mm/min的工艺参数对钻杆接头材料30CrMnSiA钢进行了表面相变硬化处理，研究了相变层的组织和硬度特征，实验结果表明,30CrMnSiA钢表面相变硬化层分为完全淬硬层，过渡层和受热影响的基体组织，硬化层的显微组织明显细化，其表面层的硬度比高频淬火的硬度提高了30%，淬硬层深度达1.7mm，比高频淬火深度提高近1倍。  相似文献   

Cyclic analysis and capacity prediction of concrete‐filled steel box columns     

K. A. S. Susantha  Hanbin Ge  Tsutomu Usami 《地震工程与结构动力学》2002,31(2):195-216

Concrete‐filled steel columns have been widely used in civil and architectural constructions throughout the world in recent years. This study is concerned with the cyclic elastoplastic analysis and capacity prediction of concrete‐filled steel columns having thick‐ and thin‐walled stiffened box‐shaped sections. An analytical procedure for determining the ultimate state of the concrete‐filled steel column is proposed based on the fiber analysis technique. Strength and ductility predictions are made by means of a new failure criterion. This is proposed based on the average failure strain of concrete and steel at critical regions. A recently developed monotonic stress–strain relation for confined concrete is modified so that it can be used in the analysis of thin‐ or thick‐walled section columns with stiffeners. A simple cyclic rule is introduced into this model in order to be used in cyclic analysis. Material non‐linearity of steel is represented by the modified two surface model developed at Nagoya University. The predictions are then compared with the existing experimental results and found to exhibit satisfactory agreement. Both small‐ and large‐scaled columns are considered in the comparisons. Copyright © 2001 John Wiley & Sons, Ltd.  相似文献   

不对称钢骨混凝土梁抗弯刚度的试验研究   总被引：1，自引：0，他引：1  

陈忠汉  邵永健  朱聘儒  殷志文 《世界地震工程》2001,17(1):103-105

文章在5根不对称钢骨混凝土梁试验研究的基础上，利用现行规范[1]中对称钢骨混凝土梁截面抗弯刚度的计算公式，提出了不对称钢骨混凝土梁截面抗弯刚度的计算方法，建立了相应的计算公式。结果表明，按照本文公式得到的计算值与实测值吻合良好。  相似文献   

钢管-钢管混凝土复合拱桥动力特性分析   总被引：13，自引：0，他引：13  

孙潮  陈宝春  陈水盛 《地震工程与工程振动》2001,21(2):48-52

福建省福鼎市山前大桥是一座应用钢管－钢管混凝土复合拱桥概念设计成的试验桥，本文以它作为研究对象，进行了动力特性的测试和计算，并讨论了主要结构参数对其动力特性的影响，为此类桥梁的设计提供参考。  相似文献   

配筋钢纤维混凝土叠合梁正截面承载力试验研究     

徐礼华 《武汉大学学报(信息科学版)》1991,(4)

本文通过17根叠合梁的试验研究,分析了钢纤维的掺入对叠合梁正截面承载力的影响;探讨了配筋钢纤维混凝土叠合梁正截面承载力计算公式。其验算结果与实测值符合良好。  相似文献   

跨海桥基海上大口径钻孔施工技术          下载免费PDF全文

顾元威 《探矿工程》1994,(5):5-7

青岛女姑山跨海桥墩基础，采用大口径海上钻孔灌注桩施工，结合工程实践，分析了海潮对地压的影响与钢护筒埋设最佳值；探讨了海上施工泥浆循环系统的合理布设；海水泥浆的配制维护及钻孔护壁等问题。  相似文献