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【期刊论文】ENVIRONMENTAL SIMULATION TEST TECHNOLOGY OF MODERN CONCRETE STRUCTURES*
吴胜兴, Shengxing Wu, Yunfeng Li
The Eighth International Symposium on Structural Engineering for Young Experts, August 20-23 2004, Xi'an, China,-0001,():
-1年11月30日
In order to study durability, crack controlling of concrete structures and characteristics of concrete at early age in simulated environment, environment simulation test technology is discussed. This paper describes the successful applications of environmental simulation technique in some fields. The key techniques of environmental test of concrete structures are analyzed. The basic scheme is put forward to construct artificial climatic environmental laboratory with auto-control and multifunction. Then the layout, function and performance of the lab are determined suitably. Finally the equipment and instruments of the lab are discussed. Based on the research, environmental test of concrete durability and crack controlling will be better performed in the future.
concrete structure,, environmental test,, durability,, crack controlling,, artificial climate
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吴胜兴
,-0001,():
-1年11月30日
介绍钢筋混凝土结构锈裂损伤的研究现状、主要结论及有待进一步研究的问题,内容涉及到钢筋混凝土结构锈裂损伤机理及其影响因素、锈裂损伤基本规律、锈裂损伤研究手段、锈裂损伤检测方法、锈裂损伤评估技术、锈裂损伤修复与加固以及钢筋混凝土结构的防腐蚀设计等。
钢筋混凝土、锈蚀裂缝、损伤机理、无损检测、鉴定与加固
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吴胜兴, 康庆
,-0001,():
-1年11月30日
钢筋混凝土框架结构正常使用期间都是带裂缝工作的,合理的分析方法必须考虑因开裂引起的非线性。本文在杆系结构有限元基础上,根据构件截面广义应力-应变关系,提出了空间框架结构非线性分析的一种简化数值方法——网格-等效截面法。该方法能考虑材料非线性,混凝土开裂导致构件有效刚度降低,混凝土徐变以及加载历程等影响因素。文中给出了相应的实施步骤,并采用借助通用有限元软件ANSYS部分功能,自编主体计算程序的混合编程方法编制了程序。通过考题,本文程序正确,计算精度满足工程要求。最后,采用本文程序,对荷载和温度作用下的某超长框架结构进行计算。
空间框架结构, 非线性分析, 网格-等效截面法, 混合编程
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吴胜兴, Wu Shengxing, Zhou Jikai, Shen Dejian, Chen Houqun
,-0001,():
-1年11月30日
The static and dynamic flexural-tensile properties of fully-graded concrete are important for the seismic safety design of high arch dams. In this paper, the static and dynamic flexural-tensile properties of fully-graded concrete of high arch dam were studied through tests. The fully-graded concrete was loaded by electro-hydraulic servo device. In the static test, the loading rate was 250N/s. In the dynamic test, earthquake was simulated by repeating loading of triangle wave with fluctuating amplitude and 1Hz frequency. Some results were achieved from these tests. Compared with the static test, the flexural strength, initial Young's modulus and cracking strain were increased in dynamic test. The phenomena in the tests showed that the concrete wasn't destroyed immediately after it was cracked. The measured crack load was about 90% of the failure load. Besides, the fracture of large-size aggregates on fracture surface of specimens were also observed obviously. These results from the tests provide effective references for the seismic safety evaluation of structures such as high arch dam.
High arch dam,, Fully-graded concrete,, Dynamic behaviour,, Flexural-tensile experiment
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吴胜兴
计算力学学报,1997,14(1):69~77,-0001,():
-1年11月30日
本文采用“最大拉应力单元开裂”准则,改进了非线性分析的迭代流程,使其最大可能地模拟实际结构的开裂情况,进而可以基于分布裂缝模式计算裂缝发生位置、裂缝间距、裂缝开展深度和宽度。算例表明,该法所计算的裂缝分布规律是正确的,计算裂缝宽度与试验实测值及规范公式计算值基本吻合,可以推广应用。
混凝土, 裂缝, 有限单元法
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