| 1. | However , the cantilever beam ’ s concrete deck of this structure will be cracked easily at the negative moment region
该结构悬臂挑梁根部混凝土板承受负弯矩,容易开裂。 |
| 2. | Fail modes which are influenced by prestressing levels , length of negative moment reinforcement and fire case are proposed
考察了预应力度、负筋长度及不同受火工况对破坏形式的影响。 |
| 3. | However , the stud welding roots in the negative moment region of the beam are often subjected to the joint action of shear stress cycling of the studs and tensile stress cycling of steel girder flanges
但在负弯矩处栓钉焊趾往往承受栓钉剪应力循环和钢梁翼缘拉应力循环的共同作用。 |
| 4. | From the test results , suggestion that negative moment reinforcement should run through the specimens to postpone the crack ' s appearance and improve the specimens " fire endurance are also proposed
由此提出了拉通板顶负筋的建议，以延缓横向贯通裂缝的出现，达到保护预应力筋和提高连续板耐火性能的目的。 |
| 5. | Therefore , the scientific scholarsboth at home and abroad have been carried series of research work since the 1960s , with some defects still remaining unresolved . the objects of this research are : ( 1 ) to analyze the course of the crack , itsappearing and development , and discuss the major factors influencing the behavior ofthe negative moment region in continuous composite beam . ( 2 ) to establish the modeand formulas of the crack width by the theoretical analysis
本文研究的主要目的是通过对组合梁负弯矩区裂缝的出现、发展的过程分析,讨论影响钢-混凝土连续组合梁负弯矩区受力性能的主要因素,建立了组合梁负弯矩区裂缝计算模式和裂缝宽度的计算公式,并初步探讨了连续组合梁合理截面形式。 |
| 6. | Consequently time and cost can be saved greatly . ( 3 ) design method for controlling cracks in the negative moment zone of the continuous composite girder the crack mechanism of the concrete deck in the negative moment zone of the coniinuous composite girder , the relationship between the crack and the int
分析认为，采用中间支点升降法与调整混凝土板施工顺序相结合的施工方法，不仅可以避免负弯矩区混凝土裂纹，还可以合理调整钢梁和混凝土板的内力，并使端支点与中间支点反力更均匀，使组合梁桥的结构更加经济合理。 |
| 7. | In this paper , the linear accumulative damage theory commonly used for calculation of the fatigue of variable amplitude stress is used to assess the fatigue of the same part of the structure due to the two kinds of stress cycling and the assessment formulae for the fatigue of the stud welding roots in the negative moment region are also provided
引入通常用于计算变幅应力疲劳的线性累积损伤理论，对2种应力循环引起的结构同一部位的疲劳进行评定，给出组合梁负弯矩区栓订焊趾疲劳评定公式。 |
| 8. | Besides , compariative analysis was carried out on ductility and energy comsumption of the interior joints on the top story with 90 ? bent hooks , exterior joints in the intermediate stories with different detailing of longintudinal reinforcement in the columns , and the knee joints with different lap splices in the beam and the column under negative moments . seismic anchorage and lap splices schemes were presented for the longitudinal rebars in the joint core
此外重点对不同条件下中间层端节点梁筋带90弯折锚固端的试验结果、顶层中节点采取不同柱筋构造方案的试验结果以及梁柱负弯矩筋采取不同搭接方案的顶层端节点的试验结果的延性和耗能性进行了对比分析。 |
| 9. | The main factors including prestressing levels , length of negative moment reinforcement and fire case which may have influence on the fail modes of the continuous slabs are examined . fire case which include end span under fire , middle span under fire and end - middle span under fire simulate different room catch fire . the regularity of deflection , prestress and reactions are presented
在连续板的火灾行为试验研究中主要考虑了预应力度、负弯矩筋的长度以及不同的受火工况三个因素，其中不同受火工况包括边跨受火、中跨受火及边中两跨同时受火三种情况，以模拟不同房间失火的情况。 |
| 10. | We analyes post - tensioned prestressing properties and comparing with practiced results . we analyse one - way precast slab sandwich negative moment section resistant crack properties and two - way precast slabs sandwich under plane resistant crack at unprestressed section and second - prestressing propties . we compare canceling bonded reinforcement with laying on bonded reinforcement resistant crack properties and deformation . auxiliary lab include : concrete resistant pollution intensity . concrete resistant compressing intensity and elastic modulus , compare with results of code . analyse sandwich ' s strain and long - time stress , strain and introduce a new method through theory calculating long - time stress and strain
配套的试验研究有：混凝土的抗拉强度和弹性模量试验及混凝土的抗压强度和弹性模量试验，混凝土的极限抗拉强度和极限拉伸应变试验，并与《混凝土结构规范》 ( gb50010 - 2002 ) ，结果进行了对比；单块夹层板放张阶段的弹性应力、应变分析和长期应力、应变分析，并详细介绍了按混凝土徐变理论进行长期应力、应变分析的方法。 |
